If I buy the Yamaha RX-V4600 and want to attach speakers in two other rooms, do I need a seperate amp in each of the additional rooms? Can I just run the speakers from the main receiver and put volume controlls in the other rooms (or use the A/B switch)? (I don't need good quality in the other rooms) . Also, can anyone recommend a radio frequency remote that won't break the bank. Any advice is much apprecaited.