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Posts Tagged ‘Acoustical Blue print’

How to use Tube Radiators to Fix any Church

Posted by jdbsound on April 1, 2019

Do you need help with the acoustics of your church? Want a system that your church can afford? Are you willing to save your church thousands of dollars by donating some of your time to cut, paint and installed the perfect acoustical solution for your church? Acoustics – complicated to figure out, simple to implement. First of all, this is a system, not a spot treatment.  Therefore, all of the walls of a worship space require treatment. This is not an option. Most readymade products are not able to solve multiple room problems in one step.  As a result, most churches wind up getting only a spot repair treatment of which they learn later was nothing more than trading one problem for another.

To begin, you need a detailed analysis of the worship space.  Some of the critical measurements are impulse responses,  series of ETC’s and the Frequency response of the room.  These tests combined with others help to map out the room.  With these details, you will be shown how to identify the standing waves, the signal to noise ratio’s, early and late reflections, echoes, slap echoes, and flutter echoes, and what frequencies are coming out of corners.  What surfaces are diaphragmatic and where the room focal points are. Finally, you have to account for the room measurements to see if any of the dimensions are causing patterns in specific frequencies and any hotspots or deadspots.   

With this information at hand, you can then create a profile to identify what kind of treatment the room needs.  For standing waves, any diffuser can get rid of that as long there are at least 4 inches of deflection and no surface of diffusion greater than 6 square feet. If you go larger than 6 square foot diffusers, then you have to make the deflection more than 5 inches deep.  You learned that from trial and error testing.  There is no equation that I am aware of that will tell you that.

Once you have determined all of your standing waves and yes, all rooms that have no acoustical management, regardless of shape have standing waves at some frequency or range of sounds. You then look at the energy coming from any diaphragmatic surfaces (drywall, wood, windows, etc.) and corners. If the excess frequencies are above 500 hertz, in most rooms, you can just use 8 inch half rounds. If there is excess energy between 300 to 500 hertz, then you need to use 12 inch half rounds.    When there is excess energy below 300 Hertz, then you will need 16 inch half rounds.  

With this knowledge, you then need to see how much reduction is needed.  If you only need 10 to 15dB of reduction, you can just put in the half round tubes in 11-inch edge to edge spacing between tubes regardless of size.  If you need more than 15dB of reduction, then you need to use patterns.  These patterns can be a combination of sizes and variable spacing distances between the tubes. These variables cannot always be used depending on how much wall space you have.  If you have the wall space and you need more than 30dB of reduction, then you need to use a Prime Number sequence and enough wall space for a minimum of two cycles. 

These patterns were researched by myself by doing a series of trial and error testing in churches where the church allowed me to use their worship space to do experiments.  With enough tubes of various sizes, these tests were done over several days at a time, to learn what patterns are needed for the most common acoustical problems most churches have.  Essentially, I created a Data Base of frequency models to affect the best change for worship spaces of all sizes.  For new acoustical problems, JdB Sound Acoustics owns a private test room where research can be done to discover the best pattern to effect the best solution for such a worship space.

In summary, there is no shortcut to doing church acoustics correctly.  That said, many churches can’t afford to hire an expert, but they also need help.  For those churches, several basic rules always assure a huge room improvement. The length of the tubes has to be a minimum of 2/3rds the wall height.  Sidewalls need the diffusers to be 4 feet off the floor or head height of people sitting in the pews.  Tube spacing is always 11 inches between edges. End caps are needed at the bottom to comply for fire code if you are using hollow tubes.  Follow these rules, and you will always get better results than any flat absorbent panel can offer. Another rule is, always have padded seating and carpeted floor.  In most cases, that gives the room the behavior that it is 50% full when it empty.  If you don’t have carpet on the floor, then you need to add absorption panels that equal the square feet of the floor space to the walls along with the diffusers.  If your wall space is limited, you can add the diffuser on top of the absorbing panels.

Every room has the same or similar problems when it comes to church acoustics.  The solutions and tools are always the same but how they are implemented needs to be customized to accommodate the architectural features of each worship space.  I have come across a few churches that followed these rules without my help, and they were delighted with the results. Yes, there was room for additional improvement in those DIY projects, but the results they got were way better and cheaper than any other solution out there.  Imagine going to Home Depot or some other place, buy around $1,500.00 worth of cardboard tubes, paint, tools, and hardware to mount the diffusers and fix the acoustics of a 500 seat church for under $2,000.00.  A project like this can be completed in 4 working days with four volunteers.  If you make absorbing panels of sufficient quantity, you will spend twice as much if you care for the aesthetics and have a fraction of the room performance improvement compared to what half-round tube diffusers or Tube Radiators can provide. 

In the end, a 15dB reduction in the mid-range, getting rid of standing waves, and because the tubes break up energy traveling down a wall, there is no bass build up in corners, so you don’t need bass traps, the room improvement will be very dramatic.  My skill comes into play for churches with strong music programs for contemporary worship services or large choirs.  Churches that want their pipe organ to have a better balance during congregational singing or for Choral performance.  Churches that want  congregational singing to be loud enough to drown out the sound system.  Then there are churches that have a lot of windows, artwork or limited wall space, for them, there are many other ways to achieve similar results using other diffusive materials and techniques that require a more substantial investment.  In many ways, most church problems are the same, but they all have unique variables that need different ways to implement the same solution. 

Solomon’s Temple – The Bible is Sufficient

Finally, why do I use this system?  It is because of God.  God showed King David and Solomon how to make the acoustics of the temple ideal for the Holy of Holies and the Holy Place/main sanctuary.  I discovered that this does indeed work.  Since re-discovering this method of sound management, I have viewed this as a promise from God.  How many times does it say in the Bible follow these command, instructions or ways, and you will be blessed or things will be better? Since learning this method of managing sound, God has kept his promise every time.  Also, consider this. 

Science has yet to create a simulation model that can accurately predict the results.  God told Solomon what to do, and this method does work.  All of the 400 plus churches that are already using this method of sound treatment, they did it as an act of faith whether they realized it or not.  I have always been honest in sharing this with everyone.  God has kept his promise to all of those churches. For those who want proof, isn’t 400 plus churches of all shapes as sizes enough?  You don’t have to believe me, but you should believe God. Since this is proof of what God teaches in the Bible is true, what does that say about the rest of the Bible?

If you don’t trust the science, if you don’t believe me or this website, you can trust God in this.  God shows how to do church acoustics, and the answer has always been out in the open, in the Bible for everyone to read it.  The shape of the sanctuary and the acoustical treatment are all there for us to follow.  Furthermore, Jesus was also present when God told Solomon what to do.  In a way, Jesus told Solomon what to do also, as you can’t separate God and Jesus.  When God speaks, Jesus speaks. 

This method of doing church acoustics is not a secret or a mystery.  It is there for everyone to know how to have the best worship spaces that Christians need and is a joy to have.  So if someone says, “that is in the Old Testament, and it is not relevant today.” I say, Jesus said he came to fulfill the laws, the prophesies and promises that He made in the Old Testament before He became flesh.  We are supposed to follow His ways because we love Him.  Because we love God and Jesus, we follow the teachings of the Bible. For far too long, we have been using secular designs of worship spaces and acoustics at the expense of not knowing the full blessings of worship God wants you to have in your church today.  Worship space designs and acoustics should never be treated as an option or another failed experiment when it doesn’t have to be that way.  If you know the scriptures, you know that this is true.

Sure, for years people have been blessed in houses of worship in all kinds of shapes, sizes, and acoustical problems because of their faith.  Fixing the acoustics of existing churches in this method has huge benefits right away and for the future.  However, only a few of them are experiencing all of the blessings God promises us when we follow His ways, including worship space designs and acoustics.  You could also say that a House of Worship is also another tool used to do a better job at fulfilling the great commission when designed according to His way. God will never stop loving us or blessing us when we make mistakes, but he did say we reap what we sow.


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The Best Worship Experiences

Posted by jdbsound on March 25, 2019

What would you prefer? A church were you can have the best worship experience or a church that looks amazing?

The organist of this church pulled every stop, pushed the peddles all the way down and the he had trouble hearing the organ just 20 feet away. At the back of the church at the sound booth, the organ was barely audible. I used a SPL meter, put it about 3 feet over my head at the back of the church and the congregational singing peaked at 105dB several time during a familiar hymn. There was no one behind us. There have been other times at other church where I designed or upgraded their acoustics were the congregation is singing acapella and they were peaking at 106dB. The good news is, singing like that doesn’t hurt your hearing.

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Church Sound and the Gospel

Posted by jdbsound on January 28, 2019

The goal of any worship space and the church sound system is not about loudness, gain before feedback, intelligibility, special sound effects for the organ or choir, having the most talented performers in the worship team, how many wireless mics, number of channels the mixer has or the name brand of equipment you have. The goal of a church worship space and the sound system is to be a safe place where the Gospel can be presented clearly and with little to no blemishes. Where every person within the worship space can hear and understand the Gospel as clearly as when having a conversation with someone only 4 feet away and sharing the Gospel. Anything less than that goal means that the spoken word can be corrupted in the journey between the minister’s mouth and ears of all those who are listening. The Gospel needs to be broadcasted and understood as clearly as reading God’s written words.

If your church has hot spots, dead spots, good sound in these seats and poor sound in those seats, then the Gospel is not being presented equally to everyone. If your sound system has technical problems during worship often, then it is a distraction, and it can make the difference of understanding something important.

The chart below shows tangible results when your worship and sound system are tested. There should be three tests.

The first is with a test speaker. It is a point source speaker that is small enough to mimic a person’s voice.

The next test is feeding a signal directly into the sound system and test those results. This test is just about the playback quality of your sound system.

The third test is to use the test speaker 30 inches from an open microphone such as a pulpit or any microphone on a stand and test the combined results of the worship space’s acoustics direct interaction of the sound system and open mics. You can also do a second version of this test and place the test speaker 4 inches from a microphone where the microphone is 45 degrees off axis.

If all three tests are not in the Yellow section, the results will let you know if it is your sound system, the acoustics or all of the above.  This is also a better indication predicting if upgrading your sound system will improve the results you are looking for. This is also a strong indicator that your worship space needs some kind of an acoustical management system

sti alcons chart conversion

You can get your church tested. It doesn’t cost much, and the results can save a life or many lives, depending on your point of view. As an independent consulting company, we offer church testing and results with no obligation to use our services in the future.

Share your comments.  Was this article helpful?

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Church Ceiling Height Chart

Posted by jdbsound on December 26, 2018

There are three key parts to what happens in church worship.  There is the spoken word, there is collaborative/congregational singing, and there is performance singing.  For a worship space to support these three events where speech is first, then congregational singing and performance singing, you need a specific design and dimensions to support these functions well.  High-quality speech should not come at the expense of the music.  Music should not come at the cost of speech.  There is a balance and part of that balance is to have enough ceiling height to support both speech and music in a contained space. 

Unfortunately, churches these days are building lower and lower ceilings in their worship spaces.  A person can assume that when so many churches have experienced only poor quality acoustics, many wonder what is the point of building a taller worship space. 

When a church builds a low ceiling, it limits congregational singing and it makes you more dependent on technology, but guess what!  The same things that limit congregational singing are what also limits the performance of the technology we affectionately call the sound systems.  So, instead of getting 100% out of your high quality, expensive sound system, you’re getting only 40 to 60% of the sound systems true performance abilities.  It is actually cheaper to build higher than the added cost of un-needed audio technology to make up the difference.   The chart below should clear the air as to the minimum height your next church should be. If you can afford to build higher, do it.  Also, a taller worship space does not mean being stuck with longer reverb times. A higher ceiling means natural room reverberation can be adjustable, and is tune-able.  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 match the size of the seating capacity of the worship space. The above chart are minimum interior ceiling heights.  If you want to build higher, you can as the singing experience gets even better.

High ceilings allow for better sound system performance with less expensive sound equipment. (A lot of pro audio contractors, installers and equipment manufacturer don’t like hearing this.)  Higher ceiling permits 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. In a way, building higher cost less both in cost and in operation over time.

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 harder to manage than a 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 that 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 most countries that have 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 1200 churches from around the world. 

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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.

image9

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.

image8

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.

image7

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 center screen is a video wall.

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

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Question! What would you do to fix the Acoustics of this Church?

Posted by jdbsound on April 1, 2015

You have a church that seats 750 people.  It is a simple rectangle room with 30 ft walls, 40 ft to the peak, 80 ft wide and 140 ft long.  The reverb is 2.2 seconds at 300 hertz and 1.3 seconds at 2000 hertz.  An Energy Time Curve test show reflections over 30dB at one second on the ETC in the 300 hertz range.  The floors are carpeted and the pews are padded seats and backs.  All of the walls and ceiling are insulated drywall on 12 inch centers.  Basically there is about 30dB of excess energy at 300 hertz.  300 Hertz has a wave length of 3.75 ft. The church has already tried 4 different sound systems over 10 years and all of them were designed and installed by companies that are supposed to be the best in the business and they all started off saying that the room needs to be fixed – but church board members vetoed anything that would change the aesthetics of the room – but it was OK to hang 2 ugly line arrays which lasted only 6 months.

The church is now asking for another sound system but this time all of the professional audio companies turned down the project and said to the church don’t call us back until you fix the room.  Now the church board has relented and they are allowing acoustical panels to be mounted on the walls. What acoustical method or system would you use to fix the problem?  What will reduce energy 30dB in this space?

For all the walls in the church, between windows, doors and bulkheads, there is only 35% of the total wall space available to mount acoustical panels on. Major issues are – Stage noise, floor monitors as loud as main speaker system in the first 10 rows.  Only 20% of the congregation is ever singing. Speech intelligibility is below 85% in full range – if you roll off the sound system at 200 hertz speech intelligibility improves to 88%.  Gain before feedback is very poor after 3 or more microphones are turned on at the same time. Subs never really sound right.  Pastor hears echoes all the time off the side walls when preaching. Drummer can never hear himself or the other worship team members – even with the headset monitors. The are currently using electronic drums but they have tried drum shields and booths without much satisfaction.

The church used to have a 40 voice choir but they never sounded very good and now with over $150,000 invested in a praise and worship team with all the latest state of the art technology and higher trained sound engineers, they sound no better than what the choir did years ago – but they are better at entertaining people!

(note: this is a fictional church but this is based on actual events that have happened recently in three southern Ontario Churches.)

Joseph De Buglio

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Church Acoustics Advertising :-)

Posted by jdbsound on March 19, 2015

Do you have an echo problem?  We have a fix for that!

Do you have a reverberation problem?  We have a fix for that too!

Are you struggling with your sound system?  We have a fix for that as well!

Having problems with your rectangle shaped church?  We have a solution for that!

Having problems with you round church?  We have a fix for that!

Having problems with you octagon church?  We know how to fix those too!

Having problems with your fan-shaped, oval-shaped or square church?  We have custom solutions just for you!

Are you not happy with your commercial warehouse, storefront or converted mall space church?  We know how to fix that!

Have you already fixed your acoustics 9 times before and your still not happy?

We can fix any church that is absent of any acoustical planning and treatment.

We can also diagnose and fix any church that has the wrong acoustical treatment to get it back on track.

We have never been to a church that we couldn’t fix but we have had churches that were not ready to make the needed changes to get what they desperately wanted.  Oh, did you know that acoustics has always been the deciding factor in the aesthetics in a house of worship whether the acoustics are good or bad.  God taught us that beginning with Solomon’s Temple. (1 kings 6:29 (NIV)On the walls all around the temple, in both the inner and outer rooms, he carved cherubim, palm trees and open flowers.  (Please read my article about Solomon’s Temple https://www.jdbsound.com/art/art570.html))

Churches are not temples but they are dedicated as worship centers and houses of learning.  For worship and learning, you need tools. One of those tools is acoustics. You need a system of managing the air between the teacher and listener for the best worship and learning experience.  While a sound system is also a tool it cannot manage the air. It relies on acoustics for it to work. The better the acoustics, the more effective a sound system is.  Without the right acoustics, what are you really hearing or understanding?

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Message for Architects and New Church Buildings

Posted by jdbsound on February 19, 2015

It has been brought to my attention by a number of church members about who gets to decide the final aesthetics of worship space interiors.  Church members of some newly built churches which are less than one year old were pointing out to me that in the end, we acoustical designers get to ultimately decide the final aesthetics of a church – not the architect, no matter how much effort an Architect puts into the aesthetics of a worship space.   If this sounds familiar then check out my post in 2012 where I made a similar post.  This discussion comes up often.

It seems that when acoustics are included in the design stage of a worship space, the Architect has the last say on the rooms aesthetics – assuming the acoustical plans are not compromised later on.  When acoustics are left out of the design phase of planning a new church, it is people like me that get the final say in the room aesthetics. Whether it is while the building is being built or anytime later – even 200 years later, it is people such as myself that often make the final aesthetic changes that will last the life time of a church building. 

The good news is, is that when we are included in the design phase of a new church, often our acoustical designs blend into the architecture and it is often not seen or at least not seen as an acoustical add-on.  In fact, often our acoustical designs come off as the Architects design of the worship space and at times to the untrained person it looks like we had done nothing.   Where friction often comes up, is when after the design of the church has been completed and the church board has given the green light, that is when someone raises the issue of acoustics.  Often there are major acoustical issues as what is taught in Architectural schools is about concert hall acoustics, school auditorium acoustics and lecture room acoustics. 

Church acoustics is totally different and I don’t know of any place were “church acoustics” is taught.  This is often why bringing someone like me after a finished design is presented to a church where butting heads starts.  When there are glaring mistakes being made and we point them out, it often means major design changes which often cost money to change at this phase.  Once past the design phase, churches are rarely ready to pay for design changes that often means delaying the project which increases costs higher.  As a result acoustics is usually left until the church is finished.  But wait!  A church is not finished until the acoustics are done.

As stated before, it is people like me who get to decide the aesthetics of a church when acoustical design is left out.  This goes for new churches, storefront churches, churches moving into commercial buildings or are using commercial building designs and churches doing renovations.  If you are an architect, include us at the beginning of the design process and the aesthetics will be all about you.  Leave us out of the design process and no matter how beautiful a space you thought you designed, it will be people like me who get to decide it’s final finish and sometimes, what we do is not very flattering but when it sounds great, the less than pleasing acoustical treatment starts to look good. 

Joseph De Buglio  

PS: Don’t call us if you want someone to just rubber stamp your worship space designs.   

  

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The question of…

Posted by jdbsound on August 20, 2012

The question of the day is, What was the purpose of the Palm Trees in Solomon’s Temple?  Was it practical, spiritual or something else?

Perhaps If I rephrase the question.  Were the carvings of the palms trees in the holy of holies added for symbolism or where they added to solve a problem related to hearing inside the two main rooms of the temple?

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