On the TFM-6 and TFM-15 amps does the C stand for Chainable and does the B stand for Bridgeable? I know these are the addition features that the CB gives you. What is a TFM-6C? Just a chainable TFM-6 that's is NOT bridgeable? When chaining several of these amps together do they need to be powered on to pass the RCA signal through to the next amp? I would like to use a bunch of these to provide music in several rooms and would just like to power on the amps for the rooms that will be use. Is this chaining feature hardwired or does it require power? Thanks in advance for your help.