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Posts Tagged ‘speakers’

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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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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Connecting Cell Phones or consumer playback devices to a Sound System

Posted by jdbsound on November 8, 2015

Well, it finally happened to me.  After warning other people for years to use a Direct Box when connecting to a sound system, what did I do, connected an IPad to a mixer with an adaptor from 1/8th stereo to 2 channels of Balanced outs.  Then boom, the IPad headphone output was fried.  How?  The mixer had global Phantom power on all of the channels and because I went into the balanced inputs rather than line level 1/4 inch inputs, the voltage of the phantom power fried the IPad.

When I brought my IPad in for repairs, fortunately it was just the headset circuit that was damaged.  The owner of the repair store said that he had seen this problem before with other IPads, computers, portable CD players and cell phones.  With one person, their IPad was so damaged that the IPad had to have the main board repaired too.  Ouch.

Fortunately, there are a few direct boxes you can use that are purpose made for connecting from consumer to pro audio equipment.  What you want is a direct box that will give you 1/8th stereo and RCA two channel input to two channel stereo outputs via XLR’s.  Some model have a switch for stereo or mono outputs.  Pad switches and ground lifts are a must as well.

On this project we were firing up the speaker system for the first time. I needed stereo output and we used an older mixer that was in storage.  We hooked up to two channel and we were outputting to stereo (even though this will be a mono system.)  OK, I wanted to impress the people who were in the room at the time.  The demo and initial speaker setup was a great success but I happened to remove the connections from the mixer while the mixer was still on.  Not sure if the unplugging or the circuit that was heated up so much that when it cooled, it came apart that signed the connection failure but the next time I turned on my IPad to hear something, it would not work.

Either way, whether you are using a PC, Laptop, Cell phone, IPad, IPod or any consumer product that has 1/8 or RCA outputs, get a proper Direct box.  They range in price from $69 to $160.  That is cheap insurance considering that fixing my IPad cost about $100.00 and 7 days to get the parts to repair it.

For sound quality and extra insurance, get DI boxes that have transformers on the input or output side.

Joseph De Buglio

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