Having worked on a Stranglers gig , The JJ head powers a 4 x 10 & ABMs power a 15" &the Di to the PA goes through a Korg Pandora for overdrive . I have the JJ500 & a ABM1000..When I gig with a Roland GR55 I use the JJ head & just use the graphic for the rooms acoustics , The JJ head has a bit more flexibility in tone with the Graphic , But I find I can stand there buggering around with the graphic for ages , The ABM naturally gets a warmer sound If I'm gigging with just a bass & no Roland Synth that's the one I use as It has everything I need , Both are great amps .