Jul. 07, 2025
This is a classic question asked time and time again when replacing carpeting. Let’s examine the impact of carpeting in the sanctuary. Carpets kill sibilance – the “tssss” “shhhh” sounds. This takes the life out of the sonic aire. Carpets have no effect on the vowel sounds – a, e, i, o, u. The issue with acoustics is, to a significant degree, the frequency response of the material. Carpet kills treble and does nothing to the bass.
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Generally, carpeted floors are not good for congregational singing. They leave the singing space too dull and boomy. On the other hand, if you like the sound of your sanctuary with the current carpet, then you should replace the carpet with a like carpet. If it feels too dead, particularly for congregational singing, consider removing, rather than replacing, the carpet. As an alternative, you might consider Berber which has a very tight weave and does almost nothing to the sound, but it is rather expensive.
The point is that hard surfaces support congregational singing and, generally speaking, churches like to have bright and lively sounding congregational areas. Many churches have carpeted walkways and wood or concrete flooring under the pews. This way there is a quiet entry and exit path with a lively singing space.
Another carpet problem to consider is that when a piano is played over carpet it dulls the sound. Try adding an office chair plastic carpet protector under the piano and you’ll hear how it brightens up and starts to actually sound like a real wood instrument. Choirs are plagued by the same problem. Putting a choir on a carpeted floor is like pulling out vocal chords.
In contrast to this, putting carpet on the floors under the chairs in Sunday school and in office spaces is an excellent idea. The rooms tend to be smaller and there is a lot of “creature noises”, such as shifting chairs, bodies, and papers. Carpet is great at quieting these noises.
Be sure you know the reasons why you want to change carpet before doing so. This will help you select the best solution for your situation. Remember, any change in the acoustics load will appear in the voice of the room. Carpet has lots of fibers which present acoustic friction. Removing carpet changes the amount of acoustic friction in the room, which changes the reverberation of the room.
This is exactly what people always try first when complaining about echoes and feedback. They generally exhaust themselves dealing with this very issue. They buy more and more electronic equipment without ever getting the improvement they need until they’re finally ready to give up on the allure of electronics, sit down, and listen and learn about the world of acoustics.
Acoustics is a whole world, invisible to the eye, but very audible to the ear. Once the sound is launched in the air, only acoustics can help guide it to where it is supposed to go. That’s what we do at ASC. We take over where the electronics leave off. Here is how we work: we get photos, floor plans, elevations, descriptions of the problem, and often times audio recordings from you. Then we estimate the probable cost for the “fix” for your particular situation. Now you have a budget to talk about. Once you decide that you’re ready to start working to fix the problem, we analyze the problem in detail, design and build the solution and you install it. You get to skip the middle man by purchasing the proper solution direct from the factory.
We can also work with your audio technician, train them to do the testing we need to analyze the room, provide appropriate photos, and conduct interviews. We do our homework before we invest any time in working up a design. We have to know what the rules are within the church so we can work within those guidelines.
To answer some of your specific concerns, you should know that it is the echoes that create feedback. Sound technicians are always fighting “gain before feedback”. Improving the on-stage acoustics is one way to improve this. Eliminating echoes also helps to improve the mic problems. Of course, it is always a good idea to first check to make sure the sound system is set up properly and not aimed directly at the microphones. Beyond this, it is the acoustics that can make the necessary improvements.
What would be the best acoustical positions for the choir and organ while a church is undergoing an interior restoration? First, it’s important to note that the physical location of the organ keyboard is one thing and the locations of the pipes or speakers is another. The type of organ or keyboard can make a difference as to where to best place it. An organ is typically played in a reverberant space. Organ music is written so that the reverberation left over from the prior note mixes with the sound of the next note to form a chord. It is important to protect the reverberant part of the sanctuary for the sake of the organ. The organ is usually located in a position that easily and loudly stimulates the reverberation of the hall in which it is located. If you move the organ, you change the relationship between the sound generated by the organ and the reverberation of the hall. The ceiling often has impact on how the sound is stored and diffused throughout the space. If you move the organ, it will change how the sound is fed to the ceiling, changing the way it sounds in the hall. Organs are often located along the centerline of a church so that they can stimulate as much reverberation in the room as possible.
It’s a good idea to contact the organ manufacturer or installer before moving the organ. They usually have a lot of experience matching the organ to the hall.
Everything pertaining to the organ also applies to the choir. Except that the choir must also be able to hear themselves. Placing the choir in a gallery allows some of the sound to be held within the gallery. The choir sound heard by the congregation is “pre-blended” by the walls, ceiling, and floor of the gallery. This makes their sound sweeter, more full, and almost larger than life. The people in the choir can hear themselves and each other because they are essentially singing in a room that happens to have a large door (the opening to the rest of the church). Choir members who can hear themselves and each other better stay in tune and on tempo better.
If you move the choir too far out into the open they struggle against the thinness of their sound. However, there are some churches who tire of the old world sounds of worship. The reverberant organ and choir may no longer be a valued part of their service. Perhaps the organ is being moved forward to join a contemporary praise band. Likewise, the choir may be being turned into the backup vocalists for the lead voices in the band. In this case, gut the old gallery, turn it into a spotlight deck and get on with the show. But, be aware that now their is a whole new issue of acoustics to deal with: the interaction of amplified sound within your reverberant hall.
Let’s ask ourselves: flat or vaulted ceiling for new sanctuary? A shallow vaulted ceiling is better than a flat ceiling. Most churches build their vaults running front to back so that there is a high wall section at the front. However, a shallow vaulted ceiling actually sounds better if the vault runs side to side. This is because the sound is stored in the high volume part of the space, which is located under the peak of the vault. So, the sound is stored side to side in the area where the people sit.
Furthermore, people’s ears are separated sideways so we are more sensitive to side to side sounds. People tend to like the spacious effect of side to side sound storage. A slightly sloped ceiling at the front of the church moves sound away from the front towards the congregation, keeping the launched sound clear and unmuddled. A slightly sloped ceiling towards the back of the seating area compresses the sound coming from the front making it louder for people sitting further away, which is good, too.
A slightly sloped ceiling still keeps the sound of congregational singing within the congregation, where it belongs, just like a flat ceiling does, which is good. Flat ceilings are not good, though. All sounds that hit the flat ceiling are reflected back down to the floor at the same time. The timing for floor-ceiling reflections is the same everywhere in the church. This creates a horrible droning tone problem.
Remember that, no matter whether you build a flat or vaulted ceiling for new sanctuary, or which direction you aim your vault, you will still need to address the acoustics of the space. This means you will typically need ASC acoustical treatment on the back wall and on the side walls.
The front of the church is usually built with a raised stage that is carpeted. You’ll want to make sure the stage is quieted from drumming and thudding sounds by building it with ASC WallDamp between the joints and filling the cavity under the stage with ASC SonicSnow. The front of most churches can be left fairly reflective.
Choir areas need proper design. Don’t put them out in the open, they need reflections returned to them so they can hear themselves and stay in tune. Don’t use carpet under the piano or choir. Carpet the speaking area and, if there is a praise band, you’ll need additional ASC acoustics to get the loudness under control and to get the mics working right.
Use one high central speaker cluster for speech and two side main speakers for music. Only the soloist should sing through the central cluster.
Things always work best if you design the church from the beginning around the acoustics. After all, if people can’t hear what’s being said, they stop coming.
If we have a sealed box subwoofer in a very small room, 8’x8’x8’, playing 40Hz wavelength 28’ or even lower, will a TubeTrap that absorbs 40 Hz or lower be useful?
Essentially, if a standing wave cannot be created, will TubeTraps do anything
Short answer is yes. If there are pressure fluctuations near the TubeTrap within its frequency range of operation it will absorb acoustic energy.
Longer answer includes the answer to another question: Is it useful to use a TubeTrap in such a situation?
Let’s go over the situation in slow motion. When the listening room is less than say 1/5th wavelength the concept of distributed acoustics tends to fade, transitioning in the “pressure pot” or “breathing mode” realm of acoustics. Envision a large hollow dumb bell, two spheres connected together with a large tube. One sphere might be 8’ in diameter and the other might be 4’ in diameter. The 8’ sphere is a model for a small room and the 4’ diameter is a model for a sealed box subwoofer cabinet. The tube between them is essentially the 15” woofer.
As the woofer shuttles air back and forth between the two sphere volumes. Here is the “standing wave” effect. At one instant we have the speaker cone pushing far forward, creating a positive pressure in the big sphere and pulling a vacuum in the smaller sphere.
At this moment we have no speaker movement, it’s fully extended, and we have no kinetic energy in the system but lots of potential, pressure energy. A quarter cycle later the piston if flying past the neutral point of the driver and the pressure in both spheres has been returned to Po, ambient pressure. When the pressures are zero, atmospheric, we have no PE and lots of moving air, which is KE, kinetic energy.
Another quarter cycle later the speaker has continued on, pulling further back until it reaches its maximum extension in reverse position, where the pressures in the two spheres are also reversed from before. Clearly, we have a resonance which alternates between potential and kinetic energy. The fraction energy absorption or leakage each cycle compared to the total energy of the system is the Q or damping factor of the resonant system. We know from experience that a Q of 10 seems to be reasonable enough in the realm of room acoustics.
There is a formula that relates room Q to Room RT60. I presented many room Q relationships in my second AES paper in , Listening Room and Low frequency Acoustics. All my AES papers are available on the ASC web site. I didn’t cover this breathing mode of the room in the paper, however the formula doesn’t change.
Q = f xT60 / 2.2. At 30 Hz and with a room Q = 10 the RT60 = 2.2 Q/f = 2.2 x 10 / 30 = 2/3rds second. Pretty fast RT for 30 Hz.
So, without any energy absorbing system at work the speaker will simply oscillate between its inertial condition and the collective stiffness of the air spring of the two air cavities. And finally, we have the answer as to why adding a bass trap to this air vibration mode is useful, which is because it helps to dampen the spring in the spring-mass system.
This discussion has excluded any consideration of the walls, floor and ceiling as if the room was a solid concrete sealed room. Most room surfaces are not solid but vented through doorways and have flexible surfaces, like sheetrock and stud walls or windows. In general, TubeTrap or other bass traps do not significantly load with friction or dampen flexing wall, floor, and ceiling movement. This is why ASC developed the WallDamp system, which extracts energy through shear stress damping from each movement of constructed wall and ceiling assemblies, back in and continues to provide WallDamp through this day.
How many TubeTraps will it take to get a Q of 10 or 15 in a small volume space?
Basically, it’s about the volume ratio between the volume of the TubeTraps and the volume of the room. Let’s say we are going for Q of 10. This means 1/10th or 10% of the energy must be removed each cycle. There are two pressure changes each cycle, one positive pressure and the other is negative pressure. The TubeTrap extracts energy out of each pressure change. That means the same TubeTrap absorbs energy out of the room twice per cycle. That means we only need 1/20th or 5% of the energy in the room volume to be removed each half cycle.
If the volume of the room is 500 cubic feet we need 1/20th of that volume performing 100% energy absorption each half cycle, which is 25 cubic feet of air volume. A 16×4 IsoThermal TubeTrap has 5 cubic feet of volume. It also should produce 50% efficiency at 30 Hz and so we need 50 cubic feet of this size trap in the room or ten of these units. We put two in each vertical corner and we are up to 8 traps already. That is a difference between Q = 10 and Q = 12.5, which is close enough.
A seasoned acoustic person might be thinking about the pressure boost, increased sound-absorbing power due to TubeTraps in corners. In the breathing mode, all pressure is same everywhere in the room, and so there is no pressure buildup in the corner.
Thanks for asking…..Art Noxon
The question of what is the best acoustic treatment I can get is asked all the time? This will depend on your particular application.
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If you are working in a Recording or Mixing Studio, if you are looking for a completely portable system, the AttackWall and QuickSoundField is the answer.
Residential and commercial sound sources are voices, and voices tend to be fairly weak in the deep bass range. Audio sound sources, typically subwoofers, are very powerful in the deep bass region. The difference between typical Residential/commercial Soundproofing and Audio Soundproofing is how the deep bass range of sound is handled.
Standard Residential/commercial Soundproofing standards are specified by the STC rating Sound Transmission Coefficients. which measures the soundproof quality of the wall in the voice range of sound 100 Hz thru 4,000 Hz, just over 5 octaves in the middle range of sound.
Audio Soundproofing performance is measures soundproof quality throughout the entire 10 octave range of sound 20 Hz to 20k Hz. The most difficult part of Audio Soundproofing involves Bass Range Soundproofing, the first 2 octaves of sound, 20 to 80 Hz. And that is our specialty, AudioRange Soundproofing.
There are two conditions for soundproofing to work. Reflect and then Absorb the unwanted sound. In residential/commercial work the sound is reflected back into the room where it came from and absorbed by wall friction, carpets and sometimes acoustic ceiling tiles. In Audio Soundproofing the Bass Range of sound cannot be reflected back into the room, it has to be absorbed within the walls of the room.
Check our specialty products which have been designed and manufactured to meet specific needs. Otherwise, every room is different and we recommend consulting with us to find the best solution to your particular situation. What is the best acoustic treatment I can get? Call us today and let’s find out.
The QuickSoundField is an incredibly versatile, adjustable and portable recording environment. The QSF allows the engineer to create an acoustically perfect sub-space within any recording environment. A virtual studio within a studio. QuickSoundField is a recording technique that uses 8 or more StudioTraps.
ASC’s QuickSoundField has revolutionized the recording industry by enabling the engineer to simply bypass the problems due to poor room acoustics and easily set up a controlled acoustic subspace system that delivers depth and clarity to your tracks, time and time again.
In a normal room, the sound is reflected off wall, ceiling and floor surfaces to produce a room signature signal that leaks back into the mic. Typical wall treatments, including acoustic foams and fiberglass panels, will dramatically reduce sound reflections, but the end result is that typical dead studio sound with no presence or ambiance that is followed by some sort of loud level room honk. Our QSF system can offer you a controlled acoustic environment, and save you time, hassles and money. No more wishing you could fix it at the mix!
The QuickSoundField is created out of an array of ASC’s patented StudioTraps, the most versatile acoustic tool for today’s modern recording studio. The front half of the StudioTrap is treble range reflective and the back side is treble range absorptive. The entire surface of the Trap is bass range absorptive. This remarkable blend of acoustic properties provides a means to the balanced, broadband control of sound.
StudioTraps are adjustable in height and are usually set up midway between the floor and ceiling, but they can be raised or lowered for different mic positions or line of sight requirements. By setting up the StudioTraps around the talent, iso-booth techniques can be developed to more easily control the sound. In the treble range, the QSF eliminates undesirable room reflections while creating a time-delayed diffusive backfill, injecting a sense of acoustic presence into the track.
The QSF satisfies all the requirements necessary for a professional iso-booth. Engineers and talent love the level of detail they can get with the QSF. They get the sound that couldn’t be heard before, even in some of the world’s most advanced studios.
Learn more on our Product Page for the QuickSoundField.
The speakers will need to be positioned so that they sit symmetrically between the walls of the room, otherwise the stereo image will be distorted. Putting speakers too close to corners tends to emphasize the bass in an unpredictable way, so try to place your speakers away from the room boundaries and make sure the setup is symmetrical, with the tweeters pointing at your head in your normal monitoring position.
Relatively small changes in speaker position can affect the sound quite significantly, so experiment with moving your speakers forward or backwards while some known commercial material is playing and aim for a smooth response, especially at the low end. If some bass notes seem louder than others, move the speakers around until the problem is minimized. Mounting the speakers on solid stands makes quite a difference.
Try to use an equilateral triangle as your basis for listening, to provide the “ideal listening position”.
If you and the speakers are all the same distance from each other, it creates a starting point for where you want to be. Depending on the size and shape of your room, this might not be possible – so just try to get as close to it as you can.
Try to keep your speakers away from the walls if possible, as the reflections of soundwaves on nearby surfaces can affect the sound. Of course, if you’ve got pets or kids, you might be more concerned with keeping them out of the way of small hands or paws!
If you’ve got the flexibility, you could also consider rearranging your furniture as well as your speaker positions to really get the most out of your system.
Most of us use rooms for multiple purposes – watching TV, spending time with friends and family, playing games, eating, listening to music… so your hi-fi system and speakers will need to work around these uses. It’s also worth considering what time of day you’re most often using your hi-fi – and positioning your speakers based on that.
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Although the acoustic treatment required to optimize the sound is different for every room, every setup, and each unique application, there are still some basic acoustic concepts that are applied universally in a properly treated room, there are definitely acoustic basics for your control & mix rooms. In this section of our website, we will present 5 of the more fundamental acoustic topics addressed in a properly treated control room or other mixing environments.
“Room” acoustics takes on a whole new meaning with ASC’s AttackWall and QuickSoundField portable, modular acoustic sub-spaces. With these systems, you get to define the acoustic signature of your recording or mixing space.
Sound is conveyed through waves in the air. Waves that exist between a pair of surfaces can create standing wave resonances whenever the distance between the surfaces is any even multiple of one-half of the wavelength. At resonant frequencies (tones), the sound is louder and decays much more slowly than at non-resonant frequencies, causing uneven tonal quality and interference with clarity. Resonant frequencies occur mainly in the bass range, due to the relationship between the wavelengths of low-frequency sounds and the typical sizes of people’s rooms.
This wave is in a standing wave resonanceEvery room has its associated resonant frequencies. Rooms built using preferred dimensions ratios have potentially more even distributions of these resonant frequencies. Room built with angles walls or ceilings have more complicated resonant modes than typical rectangular rooms and the resonances can be potentially less severe. But, no matter what the size or shape of the room, resonant frequencies can be controlled through the use of bass traps.
“Bass” frequencies occupy all the notes on the left half of the keyboard (Everything below middle C). Since this is such a large portion of the musical spectrum, and because every room has potential resonant frequency problems in this bass range, it is imperative that the low frequencies be the first issue to address in improving any room’s acoustics. Of course, each specific room’s geometry, setup, and application dictate how to best optimize the bass performance. However, there are some general enhancements that can be made using ASC TubeTraps that are sure to offer improvement in any room.
Sound and music propagate through waves and, therefore, must abide by the laws of wave physics. This means that when 2 waves “collide”, they do not bounce off one another as is the case with physical objects. Instead, at that location in space and moment in time, they either add their combined amplitudes to some degree or cancel their combined amplitudes to some degree.
Waves exactly in phase add to make a wave with twice the amplitude. Waves exactly out of phase add to make a wave of zero amplitude. Waves out of phase to a small degree add to make a wave with slightly higher amplitude than either wave individually.The wavelength of the 2 sound waves and the difference in the distances they have traveled determine whether they add to or subtract from the combined resulting amplitude. This means that there are a series of adds and cancels at various frequencies of sound for any given room setup.
There are many potential reflection points that can cause a sound launched from a source to return to that source and interfere with itself. There are also many potential ways for sounds to travel from one source to another and cause interference. Likewise, there are many ways for sounds launched from single or multiple sources to arrive at the mix position or mic position at different times and interfere with one another there. All of these interfering waves cause the resulting amplitude of the sound to either increase or decrease to some degree depending upon the frequency (tone) of the wave. The resulting adjustment to the amplitudes at each frequency is called a comb filter.
Comb filtering effects are reduced by placing acoustically absorptive materials at the reflection points responsible for the interfering waves. The materials must be of a size and type to properly address the frequencies of each specific problem. Rearranging the speaker or mic setup will simply shift the locations of reflections and alter the problem frequencies, but does not remove the problem. ASC SoundPanels, SoundPlanks, and Fractional TubeTraps are often used to control comb filter reflections, with the appropriate device chosen based upon the frequency of the problem. Although locating the precise positions of problem reflections can be a complex task, there are a few locations where controlling the reflected wave is sure to make an improvement to the sound.
There are certain paths for sound that produce a repeating loop, this must be recognized with acoustic basics for your control & mix rooms. Every time the wavefront passes the engineer or artist, it is heard as the sound is intended, but with a twist. Just as when you “click” the individual prongs on a comb in quick succession, the quickly repeating sound of the wavefront continuously passing the listener produces a distinctive “zinging” tone. This is known as flutter echo and is due to our brain’s desire to interpret air pressure fluctuations at some frequency as a particular tone. For this is exactly what is occurring as the wavefront continuously passes your ear at some rapid rate.
The flutter paths are most commonly located along lines between parallel surfaces. Speakers or recorded sound sources located between parallel surfaces are constantly sending sonic wavefronts into the repeating loops of these flutter paths.
Speaker Flutter in the Mix Environment Flutter in the Tracking Room (top view)Placing ASC TubeTraps, SoundPlanks, or SoundPanels at the reflection points for these flutter paths breaks up the flutter. This removes the tonal discoloration caused by the “zinging” sounds our brain interprets from the repeating wavefronts it encounters.
As seen in sections 2 and 3, controlling room reflections is fundamental to creating accurate sound reproduction in any room. In addition to utilizing precisely selected panels addressing comb filter and flutter problems, it is also generally desired to include the proper combination of absorption and diffusion to control sounds reflected throughout the room. The desired balance of absorption and diffusion is obtained through selection of appropriate absorptive material and proper placement to create diffractive diffusion and/or multiple time-delayed specular diffusion.
Edge-effect diffractive diffusion Multiple time-delayed specular diffusionThe proper placement and selection of panels to attain the desired reflection control is determined on a case-by-case basis due to the large number of variables involved.
Sound produced within any enclosed space will continue to exist in that space for some amount of time after it is created, decaying away until it is inaudible. If this decay time, known as the room’s reverberation time, is too long, sounds will linger within the space and begin to overlap with new sounds being made, creating an unintelligible cacophony.
Long reverberation time = Poor Intelligibility Short reverberation time = Good IntelligibilityA sufficient amount of acoustic absorption is required at all audible frequencies of sound in order to keep the reverberation time in a room short enough to have good intelligibility. The measurement of the reverberation time in a room is often referred to as RT60. The desired RT60 at an frequency varies from room to room. All ASC acoustic treatments alter the RT60 of a room to some degree. Acoustic treatment is developed with desired RT60 levels in mind.
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