Yea...that is cool. I never got the slave power amp setup using the Thunderbass with a Thunderstar bass working all that well. Will need to mess with it again. Maybe it will work better with a late model Quantum by splitting the preamp section to drive the Thunderstar Bass amp input. I modified one of the cabinets to have 4-10s. They are guitar speakers so I may need to add a passive crossover to allow better adjustment of the high end bass harmonics. JBL D140 in one cab. Not sure of the other. Maybe Jensen.
I always liked the Greg Lake bass setup with electronic crossovers for horn/lens and 18's for lowend (Greg Lake may have use 15's). Incredible bass power when using electronic crossovers and separate power amps.