Will I improve the qualitry of sound?

Somtimes the smaller amps are the sweeter sounding because there are less parts in the amp. The bigger amps will give you more volume. The music may have more ease and less strain even at lower volumes. If you are not pushing your volume control very far with your current setup than it may be all that you need.

If you are trying to achieve a better sound you may want to list your other components, perhaps you have another weak link that you are overlooking. I doubt the bigger amp will sound much different at normal listening levels. A speaker with a higher sensitivity will require less power to drive, give you more volume and result in a totally different sound.

Don't rush into anything.
Good luck!

If you are not doubling your amps output it may not make a huge diffrence, now going from 70 watts to 200 watts would make a diffrence but Stue is right on about small simple and sweet.

Nope, 70watts to 130watts, not a big difference. Whats your preamp? That may dictate more of the sound then the amp at this point. If you have all rotel, you will still get "rotel" sound despite getting a bigger amp.

Excellent previous posts. I doubt you will notice too much of a differnce. I'd consider a 200w RB-990 if you want to upgrade in the Rotel family or try a different amp. Some lower powered amps may sound more musical. Just recently bought a dual mono 60w. Rotel RB-960BX amp. What a beautifully built amp. I'm waiting on some new spk. wire (Linn K400) to fully evalute it potential. But, I'd bet this older amp just might have a nicer sound than a newer single transformer Rotel amp.