Room modes are a serious problem in many rooms. Understand what they are and how to treat them. PSI Audio AVAA is the solution and works as an active bass trap, from 15 to 150 Hz.
The guy doesn't really understand small room acoustics. First off, he mentions echo. Well, for small rooms, it's called REVERBERATION. And with two parallel walls, you might have flutter echo, but that's different than ECHO. Secondly, there are three types of room modes in small rooms. Axial, which are the largest in amplitude and they are typically in the 20hz on up to maybe 300hz and it depends on the room's dimensions. Axial modes are with 2 walls, and they typically run the entire length of the two walls. It could be front/rear, side to side or floor to ceiling. If you have an axial mode that runs the entire length of either of these two wall combinations, they run the entire length, not in just the corners. Depending on the room dimensions and frequency, you can have 1 or more "distributions" so that frequency builds up pressure, not just along the two walls, but in between the walls causing high pressure areas at various distances in between that run the entire length. Tangential room modes are less of an issue as Axial, but those are caused by 4 walls.. how they are distributed will vary depending on the dimensions of the room and the specific frequencies. They can also have distributions as well. Then there are oblique modes and those are caused by 6 wall surfaces and they are less of an issue. I highly doubt that a typical room modal pressure problems can be treated by putting one sub in a room. That's simply not going to really fix the room mode problems. It might help with a small range of frequencies, but it's not going to fully treat the room. The best way to do it is with pressure and velocity based absorption and to really get the entire room managed, you need entire walls and ceilings, and in some rare cases the floor treated with a really effective low frequency absorption technology. I have been looking into this for many years and I have found one company that sells pre built "boxes" to treat low frequency under 100hz (those typically require pressure activated absorption) and a really good performance acoustic foam (velocity based absorption for 125hz and above). What this company can also do is implement their pressure activated technology inside a wall or ceiling so it's built into the structure of the room. Otherwise, pressure activated low frequency absorption requires big, heavy cabinets. BUT, they will actually absorb the frequencies causing all of these types of room mode issues. Yes, it does get expensive, however the results are rather unbelievable. I actually visited one of their rooms back about 7 years ago and was astounded at the results. Truly amazing. But treating room modes with an active sub? It's only going to be a marginal improvement, not a true treatment to really go after all of the axial, tangental and oblique room mode issues within small rooms..
@@theboogie_monsta Duh. It's still not going to do that great of a job. Just get proper low frequency absorption and enough of it to solve your problem. Unfortunately, since our rooms have poor wall construction, the best way to do it is by building proper walls and ceiling that can absorb the low frequencies we're having problems with.
it really depends on your room mode problems and the desired effect at which position. Placing them in the corners would be more efficient for a homogenous result in the whole room. If you want to improve the listening at a sweetspot position, you will need to place them against the walls, where you have the most energy in the undesired frequency (frequencies). 2 are really efficient for rooms up to about 60sq meters. You can find more information here: www.psiaudio.com/en/our-products/avaa-c20/
