Use the pre-outs on your receiver right now to a nice tube amp. This will give you a taste of quality sound. If you really like that improvement, then go to a nicer pre/pro or a seperate stereo preamp.
Keep in mind that even though many tube amps are rated at lower power, they will have considerable headroom and clean sound, ie I would rather have a nice 40 tube amp than listen to 100 watts from the yamaha.
Finally, if you use the receiver for the center and rears only, it should sound better due to less strain on the power supply.
Keep in mind that even though many tube amps are rated at lower power, they will have considerable headroom and clean sound, ie I would rather have a nice 40 tube amp than listen to 100 watts from the yamaha.
Finally, if you use the receiver for the center and rears only, it should sound better due to less strain on the power supply.