Carbon Absorber Wall

With low frequency issues, we have the fundamental and the associated harmonics. A 30 Hz. issue has its corresponding cousin the 60, 90, 120, 150, and so on all the way through our middle frequency ranges. Its more than the fundamental issue. The harmonic “tail” can be just as destructive, especially though our sacred middle range frequencies, where our vocals and emotional connection to the music lies. Modal issues are everywhere. Low frequency energy impacts everything.

Low frequency management in small rooms is all about the proper rate and level of absorption, the square footage of coverage, and the position of that coverage. We have two choices when it comes to low frequency management technology. We can use freestanding units that meet the absorption requirements and take up additional space which we don’t have in an already built room, or we can build the technology within the walls of a new structure by using our CAW (Carbon Absorption Wall).

If we look at a wood framed structure that has the proper depth between each stud space, we have a diaphragmatic absorber. The sides of the absorber are the studs themselves. The depth of the stud space determines the resonant frequency of the cavity. Frequencies above the resonant frequency are absorbed. Those below the resonant frequency of the cavity are not. We can control the resonant frequency with cavity depth coupled with the density of the studs. Cavity depth can be increased or decreased for varied resonant frequency management.

We can mange the rate of absorption by using our carbon technology inside the cavity. If we vary the thickness of the carbon “filter”, we can increase or decrease the rate of absorption within the cavity. We can accelerate rate to match the amplitude of the room issue. The density of the front “diaphragm” or face piece that is on the room side, also plays an important role in overall performance. Using the cavity depth, thickness of the carbon filter, and density of the front plate, we have a powerful tuning weapon against low frequency pressure issues.

We have two frequency response curves to use. Our data base of 140 built and measured small rooms shows us two main problem frequency ranges. We can use a powerful more frequency specific 30 – 50 Hz. (ACDA-12) “sponge” where it is required within a room. This requirement and location is strictly dependent on room size volume, and usage. We also have a broadband response that we can employ that starts at 30 Hz. and goes through 200 Hz. (ACDA-10). Both “sponges”, with their response curves, are needed in any small audio room regardless of chosen usage.

We can use the technology on all six surfaces of the room. The ceiling to floor produces the most issues because it is the smallest of the three dimensions within most audio rooms. Floor to ceiling unwanted pressure runs the full length of the room and the full width across the ceiling. Next are the walls which are also critical in any small room reflection and time signature management. Correct time signature management assures a strong center image between our monitors. What surface we will choose to use will depend upon room size/volume/usage