Acoustic Treatment
for Gravity Studios

Fixing the Low-End
with Carbon

Gravity Studios faced all the issues that most smaller control rooms face. They had the standard low frequency issues from 30 – 100 Hz. They had higher frequency reflection issues that increased Rt-60 times. Doug was able to treat the middle and high frequency issues with standard sound absorption technologies,. He followed the same logic to go after the low end issues.

Dealing with Sound Pressure

Doug tried “bass traps”, wedges, and a host of other technologies over many years but could never find any technology that was able to manage the + 8 dB – + 11 dB low frequency energy that was focused and found a home in the front of his control room. Slowly over time, the lack of treatment success soured Doug into spending any more money on low frequency sound absorption treatment.

This is the issue with current low frequency sound absorption technologies that are currently in the marketplace. They simply do not have the necessary rates and levels of absorption do manage large low frequency issues no matter what the literature says or what the company marketing literature claims. Low frequency sound absorption requires special technology that deals with large amount of sound pressure.

Square Footage, Rates & Levels

This is why we created our activated carbon diaphragmatic absorption technology. We started with small units that were 2′ x 2′ so we could easily place them under the speakers. Space was tight and we had to crawl and position each unit which weighed 80 lbs each. We placed one under the left channel speaker and Doug played his choice of music. That was just 4 sq. ft. of absorption space.

We next placed another unit under the right channel speaker. After eight square feet was in place, we filled in the center area between the speakers. Watch the video to see the results. Realize that only 16 sq. ft. was used as a starting amount. As with all absorption technologies, it about square footage, rates and levels, and proper positioning. This is phase one of our Gravity Studio fix. Stay tuned for the phase 2.

image of acoustic fields acda bass trap

ACDA-10 Activated Carbon
Diaphragmatic Absorber

The ACDA-10 is our flagship, activated carbon, broadband, diaphragmatic absorber with low frequency absorption from 30 Hz. – 200 Hz. The face of the unit can be used to support one of our foam absorber thicknesses or one of our mini-diffusors in our MDP line. Units are designed with rigid side and rear walls and a dual wall, front panel construction that increases diaphragmatic action. The inside of each unit contains our activated carbon filters which increase the unit’s Q value through acoustical compliance enhancement. This activated carbon filter process is unique to low frequency absorbers and is patent pending. Solid wood and paint finishes are available. Each unit measures 60″ tall, 30″ wide, and 16″ deep. Each ACDA-10 unit weighs 225 pounds.

All rooms need low frequency energy control, unless you are fortunate enough to have a room that measures at least 30′ in one of it’s dimensions. The ACDA-10 is designed to be a broadband, linear, absorber targeting the 30 Hz. – 200 Hz. range. It is even effective at higher frequencies. With the ACDA-10 unit, you can also control unwanted middle and high frequency reflections through the application of one of our foam thicknesses, mini-diffusors, or a combination of both. You can now have broadband, linear, absorption from 30 Hz.- 6,500 Hz.

Read more about the ACDA-10 Diaphragmatic Absorber

About Doug McBride

Doug McBride is a Jedi Master of sound, and Gravity is his temple. As the chief Mixing and Mastering Engineer at Gravity, Doug has helmed the ship for the who’s who of local, national, and international artists right here at his home base.

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