I was thinking about picking up one of the good deals on the Parasound 855 amp, but first thought I should ask around to see if I'm understanding things correctly. When bi-amping a speaker, are you effectively doubling the output to it and does bi-amping ever present a problem to the speaker? I currently have a yamaha rx-v1000. If I decided to use it as the processor to drive another amp, would it take on the sound qualities of the new amp or carry over from the Yamaha? For example, people say that Yamaha has a bright sound and Parasound has a dark sound. Using the Yamaha as a pre and the Parasound for the amp, what would the end result be? Lastly, is there a limit to running multiple outputs to one speaker as in tri-amping if you have the extra outputs and want more power going to a speaker? Thanks!