I am not very home theatre saavy. I have a Pioneer Elite vsx49i that I am running in 7 channel format. My front two mains are Carvers and they are very inefficient. I am running preout from my Pioneer receiver to a Carver amplifier that is powering the Carver speakers. Still not enough power so I am wanting to add a second Carver amp and mono block or bi-amp. Any suggestions and how do I do this?