Originally Posted by maxmercy
The analysis is good, but he doesn't necessarily want to damp 20Hz........
Thanks for the confirmation, my math is dodgy enough to sometimes make me wonder if I did it right when I get seemingly ridiculous answers.
Yeah, I'm a victim of typical Southern house construction acting as one huge diaphramatic absorber.
Anyway, it's my understanding that turning the wall opposite the sound wall into a VLF absorber is like attaching a highly damped (massive) passive radiator to the end of a TL, damping all modes along its axial length including its fundamental (Fp) if tuned low enough, hence the example's brute force solutions.
Still, this does nothing for the other axial modes, so am a firm believer in multiple subs properly arranged around the room (or not, if enough of them are used) in 3D these days.
When it comes to dedicated HIFI/HT rooms though, my one serious attempt to deal with these issues was via room design rather than chasing down all the variables and what I use to recommend for such apps until I was ~drummed off another HT forum some years ago for it: http://www.avsforum.com/avs-vb/showt...1#post19930531