Trace stereo bass heads are generally mono input, biamp high and low frequencies or crazy power for lots of cabs. A stereo 600 W trace is two 300W amps, will drive 4 cabs or 2 of the dual 15 cabs.
like this one
Trace Elliot AH600 SMX GP12 BASS HEAD / AMP MADE IN UK - eBay (item 110683363058 end time May-09-11 16:06:35 PDT)
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