I have to decent combo amps (one is really a PA): A Rogue RB120 (1x15" @ 120 watts) and a Behringer KX1200 PA (1x15" 1x6" and a tweet @ 120 watts). As noted, both have 15 inch speakers, although only the Rogue is made for "bass applications". A few notes: -The Rogue is ported in the back, and slightly wedge shaped (kickback). -The Behringer is large enough that the Rogue will fit on top of it -Both have EQ controls, the Rogue has a low/mid/mid freq/high, while the Behringer has low/low mid/high mid/high controls. -The behringer might fit on top of the rogue (havent tried yet) but if it does, im worried about its stability (the B is significantly taller than the Rogue) -Both were dirt cheap (actually the Rogue was free) so really if my options are limited I can live with that. im just trying to make a portable mini-stack Maybe I can get a little help optimizing sound out of this banger rig?