How are you going to connect the amp to the HK? The input to the amp has to come from the HK from the pre-amp. The HK does have analog output to allow feeding an outboard amp. You have to remove the jumper pins and connect the preamp outputs to the amplifier input and then connect the preamp output to the input of the new amp. You can't use balanced cables as there are no XLR connectors on the AVR 7000. Get a set of 5 interconnects from BlueJeans Cable long enough to connect the AVR to the amp. You can use the same speakers cable you have now but each speaker has a Positive and Negative side and has to be connected to the correct terminal. The red terminal should be connected to the positive side of the speaker and the black to the negative side. Do this for all 5 speakers L,R,C,SL and SR. Copper Monster cable is fine just make sure the polarity is connected correctly and that no stray wires are touching anything except the terminal.