My yamaha yst - sw800`s amp blew recently and I was contemplating replacing the onboard amp with one from BK Electronics. Now I have been offered an Alesis RA300 power amp for a good price but I am unshure if it would work. Here is want I was thinking of doing... using the sub output off my digital amp into the power amp input (bridged to 300watts) then to the sub!! Would this setup work or would I have problems? Any opinions appreciated, thanks.