Professional amplifier for home?

[rarredoa]

Hi all,

I currently use a modest 90 watt/channel 7.1 receiver (see signature below). I have read that my Polk RTi12 towers (stereo) really sing with amplifier power MUCH higher than what I am feeding it. My question is this: Will using a professional live-sound amplifier make a considerable upgrade in sound output? I realize that 250 watts vs. 90 watts is a much bigger power increase, but does it translate to higher fidelity given my equipment?

I have noticed that live sound amplifiers don't have to be super expensive. I saw amps from Gem Sound, Gemini, behringer, etc. in the 200-250 watt/channel @8 ohm, range. Another concern is the amplifier's fan noise, how loud is it? How to connect it? I plan on using the receiver's on-board amps for the rest of the speakers in my 7.1 system. I notice that these amplifiers use xlr inputs and 1/4" plugs. I also notice that these amplifiers have individual L/R gain controls... how to calibrate? My receiver does not have any analog pre-outs, so ultimately will any of this be possible? Without some kind of signal converter?

Thanks!