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[Scott Smith]

Summing L+R mono should not cancel your bass, so check for polarity issues somehwere in signal path.  It would be hard to believe that the mixer (even a cheap one) is actually sending the signals out of phase.

One thing to note with canned music though, is a lot of older "classic rock" and similar had poor recordings where L & R bass signals were somewhat out of phase, or just mixed badly, causing serious phase issues, especially when mixed to mono.  I have personally found favorable results with "blending" the L & R signals in these cases with my DR260 processor, setting the crossed channels in at about -5db from each other.  

That would be (inputs):
channel 1: Left at 0db, Right at -5db
channel 2: Left at -5db, Right at 0 db

That narrows the stereo without completely summing to mono, with less distorted bass on those poor recordings.

With live music, this should not be an issue.

[Royce Covington]

E. Lee Dickinson wrote on Mon, 04 June 2007 05:47

Highs on a RMX850 Mids on a PLX2402 Dual 15s on a PLX3402 18s on a PLX3402

I'd use the plx3402 on the 12's, they're rated the same as the 15's and use the 2402 bridged mono on the 18's.