I've posted this question, in different forms, but I haven't gotten many replies, so I'm re-wording to be very specific. Hopefully, the resident SVS sub experts will chime in. Let's say a guy is putting together a system (usage 50% ht, 50% music). He already has more than 1 sub (let's say 2), and none of his speakers are full range. He is playing with 2 hook up options: (a) Bass in mono. Processor crossover fixed @ 90hz. Set all speakers to small and use lfe out (split to both subs). (b) Bass in stereo. Set main speakers to large and sub to no. Using external crossover (hooked to r&l main signals)allows for subs to receive stereo bass. In both options above, *ALL* bass will be directed to the 2 subs. The bass includes all hz info below the crossover point *as well as* the LFE channel. There will be no other subs, just these 2. Placement of subs may not be optimal, but due to room constraints, the subs will reside where room permits: sub1 to left of left main speaker, and sub2 to right of right main speaker. Once hooked up, the bass will be EQ'd to flatten out room response as much as possible. Questions: (1) Many say that bass is "omni-directional". Meaning, below a certain frequency, you can't/shouldn't be able to detect (from your (the main) seating position) where the bass is coming from. Sounds reasonable to me so far. First, let's define this magical number. Is it 100hz, 90hz, 80hz, 63.479hz? What do you think it is? (2) Taking into consideration the crossover frequency used in the system, is it worth the trouble to hook up the subs in stereo? Or is mono bass just as good? One would think that as the crossover gets higher and higher, the bass would become more directional? *** Overall goal here *** Bass (with 2 subs), keep it mono or hook it up in stereo? Thanks guys & gals (if we have any here). Rich B.