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The Bible and Church Sound

Posted by jdbsound on December 8, 2018

The Bible – Written my man but inspired by God.

The Bible is the most important book given to humankind. For all of those who have read the entire Bible, in the end, you are given a choice. That choice determines your eternity whether you believe in it or not. Then there is this warning in the final chapter of Revelations.

Rev 22:18 For I testify unto every man that heareth the words of the prophecy of this book If any man shall add unto these things, God shall add unto him the plagues that are written in this book: (KJV)

Rev 22:19 And if any man shall take away from the words of the book of this prophecy, God shall take away his part out of the book of life, and out of the holy city, and from the things which are written in this book. (KJV)

Most people hear about God before they read about God. For many people, besides hear about God from family, friends and other people, most people hear a message about God for the first time in a church or TV, Radio or on a Digital Device. When in a church, and eventually almost everyone goes to one in their lifetime, the Acoustics and Sound System combined can determine if a person can understand what is being said or not.

When a church has good Acoustics and Sound System, everything that everyone hears is the almost the same as the sounds that were created. When a church has good reverberation, that sound effect does not change the quality or accuracy of what is heard. When a church has poor acoustics and/or a poorly designed or adjusted sound system, what is heard and understood is often changed from what was said or sung. That change of what was said could be enough – and it often is – that it changes the meaning of what was said.

The broadcasting of sound in a large room carries a huge responsibility. When the words spoken by the minister is one thing and what is heard by the time it arrives into someone ears meters away becomes something else, that is like adding or taking away the message of the Bible. The changed words can have a huge impact on a person life. Who is responsible for controlling how a worship space performs?

Here is an example. Try saying these two sentences in your church. Have your minister say these two lines without pauses as they would do at any time of worship.
How to recognize speech.
How to wreck a nice beach.
If the listeners can’t tell these two sentences apart or they sound the same your worship space has a serious problem.

(Should You decide to do a real aural speech test, you can follow the link below and print out this speech test and try it at your church.
https://www.jdbsound.com/art/art519.html
You will need about 25 people sitting at different places in the worship space. Have each person circle one word from each row on the list of what the minister said from their list. Then compare. If everyone gets 45 to 50 of the words correct, then your worship space passes. If there are more than 5 people who have less than 45 words correct, then your church has a problem. The listeners should be all people who can have normal conversations at 5 feet away in an office, library or living room with carpet. Ages should be 35 and up.)

Ultimately, that responsibility of how well your worship space performs lays with the church board, church leaders and the minister, who should be demanding the best. The acoustics of a church is a tool to preach the Gospel. The sound system can only work as well as the acoustics of a room allows it. You can only tune, redesign, and use the best state of the Art technology in a sound system and get only so far, and then there is no choice but to fix the room.

Most Sound Equipment manufacturers do not care if people in a church cannot understand the message because the room changed the words. They just want to sell equipment and make a profit. Instead, equipment manufacturers keep making claims and promises as is if their products, their algorithms, and their digital technology is going to push the limits of physics. When you read some of the claims and advertising, if you know the science, often their claims seem to ignore physics. Physics comes from God.

Do we know everything about physics? Probably not but what we do know about Physics and Sound has not changed in the history of man. Many churches are so caught up with getting the latest and greatest technology that they put off fixing their acoustics – which is cheaper to fix – waiting for the next round of technology to miraculously break the laws of physics and make physics bow down to them. Church leaders should not be forcing people to put up with the bad sound that changes the meaning of Gods message.

Short of giving everyone a Bluetooth headset when you enter a church, the acoustics of your church is critical in whether or not a person is hearing the message word for word as a minister speaks every syllable. Hearing the Gospel is the most important thing that happens in a church. Singing and praising God together is the strongest thing that a church does to build a community. When that is followed up with fellowship, having meals together and helping people in your community, your neighbor and local town you are in, that is the full package of what a House of Worship does for the people.

The first clue that your acoustics are questionable is if you are struggling with your sound system. A sound system cannot change the acoustics of a room; it is a reflection or mirror of the performance of your worship space. I have fixed the acoustics of many churches around the world and the most interesting comments people make when they continue to use their sound system – whether properly designed or not is people can now understand what their minister is saying. More than once people who have upgraded their Sanctuary acoustics have said, “It’s too bad our minister is leaving. Now that I can understand everything that is being said, I wish the minister can stay and preach the sermons all over again. Now I understand why our church has not been growing.”

Church acoustics is not complicated, nor is it expensive to change. The Bible tells us how to get Church Acoustics right and affordable. Sadly, there are many “experts” who make church acoustics seem complicated and expensive. As long as people are spreading around such myths and those who hear these myths keep on believing them, many churches are convinced that good acoustics is beyond their financial abilities. As a result, many churches are left not living up to their obligation in creating a worship space where no words are altered and the message is so clear that people are able to make that critical decision of where they will be spending their eternity.

Finally, for those churches that have poor acoustics and the leading members who have the position and authority to make the changes to make the church building to be included in fulfilling the Great Commission, the book of Revelation is clear. For those who refuse to take the courage to make a House of God a vessel that can fulfill the Great Commission, God promises them “plagues of the Bible” or “God shall take away his part out of the book of life, and out of the holy city, and from the things which are written in this book.” As a person who has heard many ministers, one thing that is often said is that God does keep his promises. If this makes you feel uncomfortable, it should. Eternity and having a relationship with God is important. No one should be denied the opportunity to choose and your sanctuary should never get in the way of that.

Most existing churches can fix their own acoustics. There are dozens of examples on my website of churches that have made the change from a bad room to a great room. If your church looks like one of those, you can copy them and get similar results. If your church is not comfortable with DIY, give me a call. For most churches, that is all that is needed, just a phone call and those are free. If you need further help, I can recommend someone else to help you or myself.

By Joseph De Buglio
Church Acoustics by JdB Sound Acoustics

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Watch out for the Aesthetics Police!

Posted by jdbsound on November 28, 2018

acoustics predicable

Here is a simple truth. Acoustics is all about the math and a combination of a variety of principles of physics – at least that is how I do acoustical design. Then there is the aesthetics. Here is a second truth.

If a room sounds great for worship, speaking, music and children’s programs people don’t pay to much to the aesthetics. However, if what is on the walls doesn’t improve congregational singing and all aspects of worship, then what you have is wall furniture and it has to look great considering how expensive that it is. The installation shown above was done by church members. Originally there was a different design. Once the church members understood my plan, they suggested this. With a few adjustments, this is what worked. This did cost more than half round tubes but it is way less expensive than the alternative. Believe it or not, it also meets fire code.

Joseph De Buglio

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The Rabbit Hole

Posted by jdbsound on September 11, 2018

red-pill-blue-pill-Recovered

How good is your worship experience? Sound Systems play a large part of the picture. The sound system is used 100% of the time in most churches. That includes streaming, hearing impaired systems and recording of the worship program. However, a sound system broadcasting live sound to the audience can only perform as well as the room allows it. Sure, getting the latest and best State of the Art Technology in sound does sometimes gain you a slightly better level of performance but how good can a sound system be?

If we do a checklist of all the things a sound system is supposed to do, most churches that don’t have any acoustical treatment only get about 50 to 60% out of their sound system’s performance regardless of the quality of the equipment and the design of the speaker system. When a church does get the right acoustical system or if the acoustical system is built in, those churches get over 85% performance out of their sound systems, even when using just entry-level professional live sound equipment. Churches that have the right room shape that is within the Golden Ratio, they usually get a performance level over 90% out of their equipment with the right acoustical management system.

An example of system performance would be in how much gain before feedback there is. In one church, they had so much gain before feedback after their church had an acoustical change, that during a children’s play, one child was helping another child who was struggling with their lines. The nearest microphone was over 9 feet away. The sound operator was able to raise the gain to where you could hear both children. This in itself was no big deal but it was huge for the parents listening to the play. They loved what they heard. When the parents could hear the one-child coaching the other with their lines, it was a great example of how people need to encourage each other and work together. Both children were complimented for their performances. The parents felt included in all of the things happening on stage.

In most churches, experiences like this never happen. Instead, most parents complain that they couldn’t hear their child or the other kids, or get upset with the sound guys for not having enough microphones for them, or get upset with the Sunday School teacher for not teaching the kids how to use microphones. The performance of a sound system can make the difference between having a blessing and hearing the message or being so distracted that person leaves upset and any message given is totally missed.

In another example, a church had floor monitors that were so loud that the main speaker system couldn’t be used without blasting everyone in the audience. The monitors are almost as loud at the back of the church as well as up front. The worship team switched from floor monitors to in-ear monitors. At first, it seemed to work. However, if you were sitting in the front 5 rows of seating, the sound coverage was poor in about 70% of the seating. Before, the floor monitor spill helped to fill in the coverage of the shortcoming of the main speaker system design. After getting the in-ear monitors, the church went through 3 speaker systems and 3 different speaker system layout designs. The coverage issues never were resolved, even with loudspeakers recessed in the front of the stage on delays and the whole ten yards. The shape of the church didn’t help either.

Eventually, the church had to fix their acoustics because those front 5 rows of seating were always 80% occupied and that is where the Pastor’s wife always sat. With sound coverage issues resolved, the acoustical fix also resolved a boat load of problems including monitor spill. The acoustical fix made it possible for the worship team to go back to using floor monitors months later. The church was only a 500 seat space and over a 6 year period, they spent over $200,000 on just speakers, processors, amplifiers and mixers. the acoustical fix was only $4,000. Had the church addressed the acoustics first, they would have had an extra $150,000 invested into other programs or missions or helping church growth and health. Many churches are going through this process today.

A lot of churches just keep taking the “Blue pill.” Churches with money keep turning to esoteric audio hardware and hope that physics will take a back seat to the latest technology and software to help them. For churches that don’t have the funds, they just put up with bad sound and for some, declining or very high turnovers in attendance.

For those churches that take the “Red pill,” they spend way less on sound equipment and have systems sounding and performing in ways other churches can only dream about. These same churches have more enthusiastic congregational singing, better sound teams and almost zero complaints about the sound, even when the sound system is keeping up with a congregation singing over 95dB! Some Worship team members find that their talents improve. Ministers find that more people are paying attention and are asking questions or commenting on the weekly sermons through the week.

The choice is yours. Taking the “Blue pill” means one kind of outcome down the rabbit hole where magic is not real and taking the “Red pill” gives a different result. The thing is, there is no downside to taking the “Red pill” but there is for taking the “Blue pill.”

By Joseph De Buglio

Posted in Church Acoustics | Leave a Comment »

Poster of the Day

Posted by jdbsound on August 2, 2018

laws of physics poster_s

Blessings

Joseph De Buglio

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What will give you the biggest bang for the buck in upgrading the Sound of your church?

Posted by jdbsound on May 2, 2018

This 300 seat church already had a reasonable high-quality sound system.  It was properly designed for the room and professionally installed. The acoustics were not that bad.  At least it was thought that the acoustics were not such a problem.  The outstanding issues they were trying to solve or improve were:

  1. Gain before feedback,
  2. Elimination of the few deadspots that were not solved from the previous sound system when the current new JBL speakers were installed
  3. Reduce sound spill from floor monitors,
  4. Better control of the drums (when using acoustic drums) and
  5. They wanted 3dB more bass from the Sub-woofer.

These are all reasonable reasons to upgrade the sound system.

Good Speaker System setup_s

The church was considered the following upgrades.

  1. Replacing the professionally designed and installed 12-year-old JBL sound system.
  2. They considered going for IEM (in-ear monitor) system for up to 8 people. (This would have included a new digital mixer)
  3. The church considered making an air-conditioned drum booth or get an electronic drum kit.
  4. They also wanted to add a second twin 15-inch sub-woofer.
  5. Estimated total cost, almost $26,000.00 installed.

This is what the church actually did. They changed the acoustics of the room.  They installed an acoustical Tube Radiator system.

What did they gain by doing this?

  1. The sonic quality of the existing JBL speaker system was greatly improved. The improvement was noticeable better regardless of how much equalization was added or when the EQ was bypassed. (Definite proof that the acoustics of the room changed the performance of the speaker system from the day they were installed.)
  2. All of the remaining deadspots were now gone. (This was never a speaker system problem as the right speaker system design was already installed.)
  3. The performance of the speaker system was such that picking up a person’s voice went from 12 inches to 35 inches with a Shure SM58 mic before feedback would show up. (Again, acoustics limits the performance of all sound system. Sure there are some very expensive gadgets that can improve gain before feedback, but such gadget can cost more than the material cost of the acoustical fix.)
  4. The floor monitors are now well behaved. No matter how loud the floor monitors get, you definitely need to and to add the front of house to hear clear sound. As it turns out, the overall stage mix dropped around 10dB without the performers even noticing as they were now able to hear the stage mix from the monitors so well at a lower volume. You could say that the monitor spill issue is eliminated.
  5. This eliminated the need for IEM’s.
  6. Since the drummer can hear himself now, he gradually started playing quieter after a few weeks. The need for a drum cage disappeared.
  7. The Single Sub-Woofer was now able to play 9dB louder without distortion. It would have taken 3 more sub-woofers to get the same loudness without distortion. That was equal to spending around $15,000.00. (Standing waves and bass buildup in the corners added air pressure onto the surface of the cones of the subs drivers. This added air pressure creates distortion. When the subs distort, the sound quality and maximum sound levels of what the sub is supposed to be able to do, can drop up to 15dB in many rooms.)

Aylmer EMC Church Pano 2017_ss

Other improvements

Congregation Singing.

  1. The participation of people singing went up from 30% to 75%. (When people can hear themselves and the other people around them, it encourages people to sing more.)  s a resulting, the congregation is singing 8 to 15dB louder. (The more people singing, the louder they will become.)
  2. No more distortion from the speaker system with playing louder which means the perception of loudness is greatly reduced. (Standing waves and bass buildup in the corners added air pressure onto the surface of the cones of the bass driver of full range speakers. This added air pressure creates distortion. When the bass drivers distort, the sound quality and maximum sound levels of what the full range speaker is supposed to be able to do, can drop up to 15dB in many rooms.)
  3. After two years, the congregation is starting to add harmonies to their singing. (That is what happens when people can hear each other.)
  4. Now when people stand up to give testimonies or prayer requests, people can hear them whenever they forget to use hand-held wireless audience microphone.
  5. The front of house stage mix is so much better. Now you can hear all of the performers without having to blast the sound system. (A well-diffused room can make the signal to noise ratio improve from 3dB to 25dB. As the signal to noise improves, the easier it is to settle into a high quality.)
  6. The worship space is now concert quality for any high SPL event, recitals, choirs or orchestral events.

The total cost of the acoustical system including painting the whole sanctuary. $1,400.00
Since this as a DIY project, the money saved went towards a better headset mic for the pastor and the new digital mixer. Total upgrade, $5,000.00. If the church contract out the installation of the Sono Tubes, add $5,200.00. That is still 60% of the cost of upgrading a perfectly good sound system if everything is contracted out or an 83% difference.

Conclusion

One can honestly say that fixing the acoustics had a far better return on investment versus just upgrading the speaker system alone. Upgrading the speaker system can never make the room sound better, improve congregational singing and it would have not been possible to delete the deadspots without adding more speakers on delays around the room. This transformation is typical of the new worship experience when a church gets the acoustics they are supposed to have. In the battle between acoustics vs sound systems, acoustics always wins. It’s Physics. Try moving a wall with air? You can’t. Change the wall and hear what happens!

 

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Dead Spots – Sound System or Acoustics?

Posted by jdbsound on April 9, 2018

An unwelcomed guest in any church is Mr. Deadspots. Unfortunately, deadspots in churches are more common than you think. There are two main types of deadspots. Some are frequency related/comb filtering interference and others are dips in sound levels greater that 6dB created by the room.

It is common to see frequency related deadspots in Left/Right sound system regardless if they are Line Arrays or point and shoot speakers. These deadspots are created by interference patterns in a mono speech system as a persons voice is always mono.  These deadspots are where you shift from one foot to another and notice a sound change. In these cases it becomes a problem when on one foot you hear the highs but not the lows. When you shift your position onto the other foot, you hear the lows and the highs disappear. People with hearing aids or early stages of hearing lose notice this the most. People with good hearing notice the change too but learn quickly to put up with it. Some young people think of it as a passive noise filter. If the music is too bright, stand to one side of your seating position. If the music is too boomy, shift to the other side of your seating position. Really! Isn’t that like buying a headset and controlling the sound changes with what angle you tilt your head. It might sound like a great idea until you find yourself with a lot of neck pain. No thank you.

Sound level dips are usually acoustically related. These are created with standing waves, bass building up, hollow walls, room corners, and parallel surfaces that include walls, ceilings and floors and concaved surfaces. In all of these cases, often mid and bass energy build up and the highs are absorbed with carpets, padded pews and people. By the nature of churches and how they are used, carpeted floors and padded seating often represents how the church sounds when it is 50% full. That means that if your attendance is often over 50%, the effects of padded seating and carpeted floors has little to no impact. If church attendance is often over 70% a carpeted floor makes the room more intimate during times of prayer and solemn reverence. In the end, carpets and padded seating is a good thing.

However, because of people in the room, once that room attendance is above 50% the people absorb enough highs that extra mids and bass energy is left behind as is being amplified between parallel surfaces. This excess energy automatically masks the highs. When the highs are masked, speech and music intelligibility drops. The kicker is, if you go around the room with a sound level meter, often the sound levels don’t drop much, even when you stand in a spot where the highs (when you measure just the highs) drop off over 6dB. That is because the excess bass energy is so strong that it fools the sound meter as the meter is reading an average sound level. When you take sound level readings by frequency, then you notice the high number of deadspots in the room. Get a tone generator in a cell phone or computer app and play a constant tone at 55dB at 500 Hertz, 1000 Hertz and 3000 Hertz and then start walking around. At 500 Hertz you shouldn’t notice much of change until you get close to walls. At 1000 Hertz you will notice more changes. At 3000 Hertz, if you are hearing a lot of changes, imagine what 25% of your church audience is experiencing.

Here is a church that had both acoustical and sound system created deadspots, with a central cluster. By nature of a central cluster, in a good room, it gives the best coverage and performance for speech. There is no better way to design a church sound system unless your ceiling is less than 14 ft. high. Choice of speakers, coverage patterns and speaker placement impacts sound too but these are mainly tone qualities and gain before feedback related. It may have up to a 2 or 3% impact on overall intelligibility as well.

corner view pano Ebeneezer Church_s

In this church example, it already has a fairly good quality speaker system in the ideal location for the room. It is designed as a central cluster and by nature, in this setup, it should perform well. However, it didn’t matter if you used the main speaker system or used portable speakers on stands, with any sound amplified you could find deadspots all over the room. On top of that, if you raised your voice in the room, once you were more than 18 feet from someone, understand what was being said was difficult to impossible depending on dictions of the person talking and how good is one’s hearing. When the proper acoustical fix was applied, all of those problems went away and the church didn’t need to upgrade the speaker system.

The church decided to leave the sound system alone as the gain before feedback improved and all of the deadspots disappeared. Since this is a traditional church that has no intentions to do anything contemporary, the acoustical fix was designed to not change the overall reverb time. Before and after reverb time remained about the same. 1.7 seconds.  It was the frequency response of the room that saw a major change. As the graphs shows below, where the mixer for the worship space was located, it was also one of many spots where weird measurements were recorded before. We found dozens of spots where the room measurements went squirrely. This is typical of the results of measuring a Left/Right speaker system, not a cluster system. These weird results were a result of room acoustics and not the sound system.  We used our own test speaker for all room testing.

Sound Booth Before and After

After checking our test equipment for errors, it was then realized that by just moving the mic over a few inches, you would get a very different result. In some places, the sound was perfectly fine but move over a few inches and it was not. Our ears are about 8 inches apart. In one row of seating, the largest distance we could move the test mic between a good spot and bad spot was 14 inches. Pew seating is 18 inches.  Every seating position had both good and bad sound. What we were measuring was sound masking in the mids and lows.  The energy was so strong that it masked the highs.  Not only that but the highs were most likely also being canceled from nearby wall reflection between 1800 to 5000 Hertz.  It gave the impression that there was something wrong with the sound system.

In this church, people marked their seating positions by placing personal pillows in spots where the sound was better. Sure enough, testing these spots showed better sound before the acoustical treatment was applied. After the acoustical system was installed, the sound was the same no matter where you sat including the sound booth.

Deadspots in churches are more often a result of worship space design and not a result of sound system design (unless you have the wrong speaker system design for your room). When a church replaces a well-designed sound within 10 years, and have little to no overall improvement after an upgrade, that should be a BIG RED FLAG that you most likely have a serious acoustical problem and no amount of money spent on the sound system can make those problems go away. Besides, these days, acoustical fixes cost less than sound system fixes. As a caveat, our experience has been this. Churches that have fixed their acoustics and then wanted on to expand their music programs, they were able to upscale their sound system with a much higher budget as they upgraded, it actually lead to better performance rather than an exchange of one set of problems for another.

Bottom line is, get your church properly tested. Have someone who knows how to properly diagnose the data, and then design your church a proper acoustical management system. Install the acoustical system and watch the congregation respond and grow. Don’t be surprised if other churches want to use your church for musical and recording events. Your property value may go up too.

Note – The acoustical system is made up of 8 and 12 inch half round plaster covered foam diffusers on 3 walls.  The side walls use a gradient pattern to maximize room performance. On the back wall there are 24 units of 7 ft. x 2 ft. x 18 inch plaster covered foam diffusers that are hollow which allows for additional passive room equalizing in the near future. Project completed by church members.

By Joseph De Buglio
JdB Sound Acoustics

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Acoustics for only $0.20 per square foot

Posted by jdbsound on February 24, 2018


What is four inches thick, eight inches wide and comes in length up to 32 ft that can absorb sound down to 80 Hertz and preserves sound energy above 2000 Hertz?

What is six inches thick, twelve inches wide and comes in lengths up to 32 ft that can absorb sound down to 50 Hertz and preserves sound energy above 2500 Hertz?

What is eight inches thick, sixteen inches wide and comes in lengths up to 32 ft that can absorb sound down to 20 Hertz and preserves sound energy above 3000 Hertz?

Tube Radiators. It’s all about the shape and not what they are made of. Nothing controls sound at this rate that is also affordable for everyone to use. They make churches to sound great, home theatres sound amazing, cut production time in a recording studio up to 50%, and manage noise in the work place at less than $0.20 per sq ft. Who knew?

Sono Tube Diffuser profile_s

 

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The two edge sword of Church Acoustics

Posted by jdbsound on February 13, 2018

The Rectangle is the best sounding room with the right acoustical management system. The Rectangle is the worst sounding room without an acoustical management system.

An Acoustical Management system is being able to anticipate all of the ways a worship space is used and then design a custom acoustical system that can be installed to manage all or most of the worship acoustical events in one step.

By Joseph De Buglio

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Don’t Share Microphones!!!

Posted by jdbsound on January 30, 2018

Hi Everyone,

With cold and flu season hitting everyone so hard, just thought to remind those who sing or preach in church to not share microphones. Microphones are a great way to pass on the cold, flu and other contagious illnesses. You voice is a musical instrument and you need to do everything to keep it in good working order. For this reason, you should own your own microphone. By not sharing you mic, you can avoid getting sick or at least get sick less often. Here is an article I wrote in 2009 that is still relevant today. http://www.jdbsound.com/microphone_health.pdf

Joseph De Buglio

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Vintage Balcony Delay from the 1950’s

Posted by jdbsound on November 25, 2017

This is a vintage passive Analog delay. Most likely installed in this 1800 seat church in the late 1940s or early 1950s. When this delay was installed, there were no electronic devices invented yet to give a long enough delay that this church needed. This delay was used to manage sound under and above a balcony for around 700 seats. It is a 2-inch conduit pipe with a high-frequency horn driver at one end and a quality microphone on the other. The length of the pipe is about 25% longer than the distance between the pulpit to the front face of the balcony. Whoever designed this understood very well about the HASS effect. This system was working very well into the 1990s where it was upgraded to a digital delay and new speaker system to accommodate the transition to a contemporary worship service.

Vintage passive delay

If you look closely you can see the wire for the microphone on top and the Green Altec high-frequency compression horn at the bottom. The microphone was moved back and forth in the pipe until they got the best delay setting. Then the pipe was sealed. The frequency response of this setup was very good. It was +/- 2dB from 1800 to 6000 Hertz. If this church continued with their traditional worship service, this delay could have continued to serve the church.

For most under balcony installations, you don’t need full range boxes. All you need is sound from 1200 Hertz and up as the low-frequency information will go around objects and under the balcony. If you ever walk into a church and hear great sound under the balcony and don’t see any speaker boxes and grills, if you look closer, you will most likely see just tweeters mounted with or without a small baffle about 6 x 3 inches. Using this approach means that a budget limited church can afford a very high-end quality sound under the balcony with better, even sound distribution. This also allows you to use a lower cost 25-volt distribution system for each delay line and you can tap off each tweeter at 1 watt as that is all you will need.

Oddly enough, today, a digital delay is often included in Digital mixers and speaker processors. To build this passive today would cost as much or more than a 16 channel digital mixer (as of 2017). Historically, this church could have used a reel to reel tape recorder on a loop to create the right delay. In those days this passive system may have cost around $500.00, whereas a reel to reel system would have cost around $2,500.00. And consider this, the tape would have had to be replaced often, the belts inside of the recorder would have to be replaced often and delay drift would require readjusting as belts would stretch over time. A reel to reel loop system would have been an ongoing expense that most churches would want to avoid.

I don’t know who coined the phrase, “set it and forget it” (Ron Popeil is credited for using that phrase in infomercials of the 1980s.) but this passive delay system was just that. Once set, you could forget about it and it would last forever. This is an excellent example of high-quality sound churches can afford. Whoever designed all of this did an excellent job.

(This is information is not yet in Wikipedia. Nov 2017)

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Where are the Carboard Tubes

Posted by jdbsound on August 28, 2017

Churches use a lot of Cardboard Tubes in acoustical room fixes because they are very effective in getting the room performance they want and need.  Cardboard Tube not only outperform all other acoustical products in churches but they are also the most affordable.  There is nothing that can do what half round tubes can do, even at 40 times the cost.

Ok then, what if you don’t like the look of cardboard tubes around your worship space.  Here is an option some churches have been willing to spend a little extra for.

image10

These look like standard 5 inch deep absorbing panels.  They are not.  These are Sono Tubes mounted in a wooden frame and covered with cloth.

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The cloth was an added expense and it was worth it.  The fire rated cloth is expensive and before covering the panels, you want to make sure the acoustical system is going to work and work it did.  The church is very happy with the results and they are enjoying the room.

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This is what the installation looked like before it was covered.  The wooden frame has no effect on the performance of the half round tubes.  The cloth only affects frequencies above 10,000 Hertz which means they have no effect on speech or music.  In this installation three sizes of tubes were used.

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At the bottom is a huge video wall screen.  On the wall are the Sono Tubes.  Yes, the tubes will work behind a vinyl screen.  If you notice the pattern of the diffusers on the wall. that pattern was needed to control lower mids and bass sound energy.  This pattern was pretested in our test room.

northside church video wall

Here is the finished installation of the video system.  It takes three projectors for each screen.  The centre screen is a video wall.

Photos courtesy of Frederic Lachance of Northside Church in Coquitlam BC, 2017.

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Church Ceiling Height Chart

Posted by jdbsound on May 26, 2017

Churches these days are building lower and lower building.  I guess when so many churches have experienced only poor quality acoustics, many wonder what is the point of building a taller worship space.  As it turns out, existing worship space acoustics is doing fine and a lot of churches are are getting their acoustics fixed, sounding better today than they ever did before.

When a church builds a low ceiling, it limits congregational singing and it makes you more dependant on technology, but guess what!  The same things that limits congregational singing is what also limits the performance of all sound systems.  So, instead of getting 100% out of your high quality over priced expensive sound system, your getting only 40 to 60% of the sound systems true performance abilities.  It is actually cheaper to build higher than the added cost of audio technology to make up the difference.   The chart below should clear the air as to the minimum height your next church should be.  Also, a taller worship space does not mean being stuck with longer reverb times. A higher ceiling means natural room reverberation is adjustable and tuneable.  With a taller ceiling you can change the frequency response of the whole room without needing a sound system or equalizer.

Minimum Church Ceiling height Chart.JPG

Church height is important for a worship space.  One of the biggest parts of worship is singing.  Congregational singing to be specific.  When singing as a group, several elements are required for a good and healthy worship experience.  There is chorusing, harmony, sound volume or loudness of the singing and being able to hear yourself as well as the people around you.  When all of these elements are in balance, the worship experience is like no other.  The majority of people get a lot of satisfaction from the singing experience during worshiping in rooms that have ceiling heights that matches the size of the seating capacity of the worship space. The above chart are minimum heights.  If you want to build higher, you can as the singing experience gets even better but the improvement is more subtle.
High ceilings allow better and less expensive sound systems to be used.  Higher ceiling permit better gain before feedback and it becomes easier to isolate drums and floor monitor. The performance of the sound system is much better too when that is coupled with a good quality acoustical management system.
There are economic advantages too.  The higher the ceiling, the cheaper it is to heat and cool when using a vertical displacement HVAC type system which is specifically designed for large gathering spaces for people.  Such systems cost less to install, they use smaller HVAC components and cost about 30 to 40% less to operate.  In addition, the cooling systems last 2 to 3 times longer before needing to be replaced.
Another thing to consider. If building new, don’t build a flat ceiling that is parallel to the floor. (and it doesn’t count of you put in a sloping floor.)  Many churches that are moving into commercial buildings are learning the hard way that flat ceilings limit the quality of live musical performances and congregational singing.  Sure, there are acoustical panels that can slightly improve the room for amplified sound, but the cost doesn’t justify the returns.  There is little that can help congregational singing even if you have the height. Vertical standing waves are hard to manage than horizontal standing wave. If you know what you are doing, horizontal standing waves can be controlled to create an outstanding room.  It is part of the formula for the almost perfect worship space.  Funny though, most concert musicians that perform in a church that I have fixed, they often make comments like, “I wish our concert hall sounded and performed as well.”  That is almost like saying, “concert halls make for lousy worship space but worship spaces can perform better than a concert hall.”
*Note* In any country that has freedom of religion laws, the worship space portion of a church building has no roof heights limits regardless of local city building height restrictions. 

**Note** The data is based on 2800 churches from North America, Europe, Philippines and Central America. 

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