I just bought an Onkyo 797 which I really love, and it give me a lot of power, but can I use an extra two channel amp to power my front speakers? Will this throw off the balance of the sound? Won't the front L/R be louder than the others if I do this, or does it just work out? Or do I HAVE to buy a 5ch amp? I ask because for stereo purposes, I wish there was a little more omph for my 4ohm towers. I am looking at a Rotel or Parasound...favoring a Parasound HCA-1000A, or maybe a HCA-855A, but I would rather have the extra omph in stereo, no extra in surround is needed, can i just buy a 2ch amp?