Church Acoustics and Church Sound Systems

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Posts Tagged ‘Frequency Response’

How to use Cardboard Tubes to Fix a Church

Posted by jdbsound on April 1, 2019

Acoustics – complicated to figure it all out, simple to implement. First of all, this is a system, not a spot treatment.  Therefore, all of the walls of a room require treatment.  This is true for all acoustical artifacts, but most products are not able to solve multiple room problems.  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 room.  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 able to identify the standing waves 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.  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 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 models to affect the best change for worship spaces of all sizes.  For some churches that present a new problem, 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 each room has.  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 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 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. 

Finally, why do I use this system?  It is because of God.  God showed Solomon how to make the acoustics of the temple ideal for the Holy of Holies and the 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 showed me 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.  We Love God.  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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New Church Sound System Equalization Schedule

Posted by jdbsound on February 17, 2016

Notice to all Clients of JdB Sound Acoustics.

If you are in a new church building or you have done major renovations in your church, you will have to re-equalize the sound system many times in the first few years.  Here is the Schedule you should follow.

  1. First year – After the 1st month, 3rd month, 6th month, 9th month and 12th month
  2. Second year – After the 4th month, 8th month and 12th month.
  3. Third year – same as year 2
  4. Fourth year – after the 6th and 12 month.
  5. Fifth year – same as year 4
  6. Sixth to tenth year, every 8 month.
  7. After that, once a year.

It take up to ten years for most building to fully cure or longer depending on how much concrete and wood is used.  For that reason, the humidity of the church becomes lower and lower as the church ages which also changes the sound of the worship space.

Also, depending on the climate area you are in, you should be re-equalizing your church sound system for each season.  more so the further you are from the equator.  If you have a digital processor or mixer, you can have presets for the room changes.

Joseph De Buglio

 

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First Acoustical Impressions

Posted by jdbsound on January 31, 2015

These are the most popular comment congregational members say after the first worship service with their new acoustics. “Love the way the new sound system works.  I can hear everything now!”  or “Did we get a new sound system?  I actually understood the music and the ministers message.” or “What did they do to the sound system?  The people are singing, the music sounds great and I can remember what the minister preached about.  Guess I’m going to have to come more often.”

The influence of the sound system in churches is so powerful that even when you do fix the room, people often judge the room by the sound system’s performance rather than how the room sings or how the room projects people’s voice or how the sound is getting off the stage rather than overloading the stage.  Acoustical changes is way more powerful than what any change a sound system can do but when a sound system falls short, it must be the technology and somewhere someone has a gadget to fix that if you can afford it.  Did you know that most acoustical fixes cost less than the speaker system most churches own?

Joseph De Buglio

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