originally Posted by Alex
I'd take a speakon-speakon lead from the bridged output of the PLX (wired for normal bridging) to the B4's speakon input. Without connecting the B2s that would mean you'd have the amp driving the B4 with about 2000W bridged into 8 ohms. Then run a single banana-banana lead (remember the speakon lead has two conductors inside, one +, one -, so it's two lead in one) from the red (+) banana jack on the B4 to the red banana jack on the first B2. Next, run another banana-banana lead from the black (-) banana jack on the first B2 to the red banana jack on the second B2. Finally with a third banana-banana lead, connect the black banana jack on the second B2 to the black banana jack on the B4.
Tada! Two B2 in series, connected in parallel with the B4, all driven by a single speakon from a bridged amp. 3000W of fun and games from a PLX 3002!!!