The difference between 30 watts and 60 watts is only 3db. You need a 10db increase to get a noticable difference.
In my opinion, the pass XA60's will sound a lot more powerful than you think. They have much greater dynamic headroom than may amps 3 times their power. The Pass amp will recover faster from being driven hard and shouldn't distort on loud peaks due to massive power supplies and transformers. If the average listener uses only 3-5 watts, you will never notice the difference. If you play quite loudly, then you will.
In my opinion, the pass XA60's will sound a lot more powerful than you think. They have much greater dynamic headroom than may amps 3 times their power. The Pass amp will recover faster from being driven hard and shouldn't distort on loud peaks due to massive power supplies and transformers. If the average listener uses only 3-5 watts, you will never notice the difference. If you play quite loudly, then you will.