I have a DIY sub with a built in amp. The amp has both RCA and speaker level inputs. I have a 2 channel and HT system in one and I use a preamp with an HT bypass to seperate both systems. I would like to connect the LFE out from my receiver to the RCA input on the sub amp (which is how its connected now) but Id also like to use my sub in 2 channel listening and the only way to do that is to run another set of speaker cables from the amp to the speeker level inputs on the sub amp. When in 2 channel mode the sub amp will only be getting signals from the speaker level inputs. When I switch to HT mode it will be getting signal from the RCA inputs coming from the LFE output on the receiver AND still from the speaker level inputs from the amp. Will this blow the amp up? Hell is it even possible? What would be a better alternative? My preamp does have 2 outputs but Ive heard its better to go the speaker wire way and not the RCA way.