Ah yes, another acoustical product with Absorption Coefficients greater than 1.0 across the entire LISTED spectrum(almost), AND they are advertised as "PANEL/BASS TRAPS. On top of that, they say
1). The frame is on the "back" which is totally confusing..ie..on the back of WHAT? The panel? if so, then why do I see it? And if so, how would it make a MEMBRANE(Panel absorber) NOT to mention :
2)4" of absorption material(mineral), which is WHERE? If the frame is on the back, which I see in the picture as ON THE SIDES,
would imply that the 4" depth is contained within the frame, which MEANS, if this 4" thickness is BEHIND a membane, then it does NOT perform RESISTANCE ABSORPTION (to wavefronts within the room), so the high frequency coefficients are totally confusing.
I wonder under what STANDARD these numbers were obtained or at what lab they were tested hmmmmm? Ask them to show you the Lab test results and what standard was used and I'll bet $100 they won't show you.
To quote a well known and respected acoustician about absorption coeffiecients....
"in regard to what's provided in a lab report, capitalism sometimes rears it's ugly head there, too. "
Personally, I refer to what my Dad always said.. I LIAR in any form is still a LIAR. AND I'm calling this manufacturer EXACTLY THAT!!!
apl wrote:
Those look nice, but they're not really bass traps because they don't go low enough. Bass traps that size have are airtight and have a diaphragm and absorptive material. The absorber doesn't touch the memebrane.
Hmmm, you have me confused with this statement also. IF the specs actually reflected REALITY, their LISTED coefficient at 125hz is more than 1.0(which is highly doubtful), which is what I consider BASS frequencies. So what would NOT make this a bass trap? Moreover, MEMBRANE absorbers are NOT broadband, which their specs suggest they are. With membrane absorbers, the absorption occurs via the flexing of the membrane(energy to heat), they have a narrow absorption band, AND they can send other frequencies back into the room. I believe the absorption material within is to smooth out the resonant peak within the cavity, no? So how would they absorb at the frequencies listed??????Hmmm, can you please explain?
arrrrrggggggggggrrrrrrrrrr!!!!!
fitZ