Just something I missed, the 6070 may have 7.1 preamp out but it only has 6x100watt amps, so you may have the connections for left and right centre back and the kenwood would then decode and split the information to two channels.If not than you will be stuck with just the one connection.As for...
If your amp is only 6.1 than it is missing the decoders required for 7.1 also your centre rear connections would only be a single connection, you could connect both a left and right centre back to the same connection although you will get the same sound out of both speakers.A unit with a 7.1...