Dear @martin-andersen : First than all you don’t need 4 subs to have a fine room/system with out standing waves at your seat position. You need only two powered subs with a high pass filter for your main speakers.
I respect what other gentlemans posted about but all them are wrong. I repeat that for one seat position we need tewo powered subs and that’s enough.
Now, yes you need that subs goes below 20hz. Again who tells/tolds you other thing just does not know for sure what’s talking about.
One critical issue is that we need not only that subs goes below 20hz but we need too a high quality level of that bass range performance. Not all subs can do that.
My advise to you is to look at Velodyne and HSU. As an example the THD on the Velodyne subs are below 0.5%. No other of the subs named in this thread are nearer that critical figure.
I own an out of production model that with its patented accelerometer servo control check over 16K times each second the woofer movements to preclude distortion levels go higher thaN 0.5%.
iN THE OTHER SIDE hsu IS A LOW PROFILE SUB MANUFACTURER FOR MANY YEARS AND IS BETTER KNOW IN THE PROFESSIONAL AREA, IT’S knowledge levels about is out of question.
Look first than all for bass quality and not for the : boom, boom, boom that is not MUSIC at all
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.
