Since bass is more or less non directional and very low bass even more so I don't really see the need unless it is a very large room. Two work very well in my music and HT setups.
I use 3. 2 JL113's in the front for HT/2 channel & a Rel Stadium III in the rear for HT only. It does take a while to get it right with 3 subs have fun with 4.
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