Thx russ69. Thinking of this, rca/line level connections in and out,etc:
STI, Pre-Out L&R both -- to--- SB3000 sub's L&R InPuts.
SB-3000 L&R Outputs to: L is to DSPeaker L Input, R out to DSP R Input. (and from DSP output back to power amp w/room corr & altered signal for mains/D2s).
But to get a line level signal to both SB-2000 subs on left side of room?
Y off from SB-3000, just before going into LR inputs to DSPunit, and then run lines to both 2000 subs, or daisy chain both off one line, L or R?
I might very carefully try this. Perhaps the line-level output of the SB-3000 is sufficient to run the DSPeaker unit and activate/provide signal to run 2000 subs as well. Who knows? :-)