First things first - this is my bed plane at "raw" state - after phase delay and SPL adjustents - no fancy target curves or whatever applied. Interesting thing - both L-R speakers needed to be inverted in order to get proper alignment with sub array
almost perfect L-R RT60 symmetry and eveneness. This is one of the most important parameters to look at re imaging and soundstage [together with ETC]
Now to my BASS Setup - it is variant of Double Bass Array - setup, that is quite popular in Germany - basically you should place 4 subs on front wall as near to ideal 1/4 3/4 grid in both vertical an horizontal plane. This should take care for most of the modes. Trick is, to put ANOTHER 4 subs in the same confguration on the back wall - do some math re volumes and delays and invert the phase - rear subs then act as active absorbers.
Works very well in rectangular rooms, mine is a rhomboid, so I am at 80% of potential.
But the result is still phenomenal - everything people hope to get from MSO + dynamics and Headroom - in my current setup I have approx 35dB headroom vs Reference level. Also working with one global EQ at th end of teh process helps a lot.
I would recommend this to everybody, building dedicated HT - I have heard some great subs in HT;s - 4 subs in corners, Geddes, Velti, MSO even Harman custom setup. But this is still level above. Not fancy overblown bass around 40Hz, but really punchy textured, unlocalizable dynamic.
From HW perspective - it requires ability to steer each sub individually [can be something like 2x8 from MiniDsp or then high-end AVP's like Trinnov or Storm. ANd 8 subs, that need to be as near to the wall as possble [mine are 30cm deep]
Drivers are Italian made, same s PSA is using for their subs. I ended up wiht 18in, 21 in would be an overkill and woould require more compromises, than I was willing to make. 12Hz and 130dB is good enough for me.
