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You really can't have too much power, but you can sure use too much power! I would imaging that a high quality 200wt amp would be more than you would ever need and probably wouldn't cost near as much. If you've never heard this amp and your speakers, in your house, why do you like the Pass amps? They sure look nice and they've got a great reputation but that doesn't mean you'll like them or that you need them either.
FWIW. Your money.
Getting an amp that can deliver more than what your speaker's manual requires is not, in itself a problem. If anything, an amp running at something less than capacity will probably sound better. Not your case, but this is a given with tube amps.
Warning: watch out for those really rare(?) moments when your volume is turned at full...don't know why, but this just sometimes....happens.
Too much of anything can hurt, especially the tweeters.
I would prefer to slightly underpower speakers than overpower them. I have heard amps that overdrive speakers by sheer current delivery & the results in terms of sound quality was horrible! Speakers can be rated let's say at 200 watts but can handle 500 watt peaks (pay attention to this spec) & would probably be fine using a 300 to 400 watt per channel amp.
I would prefer to slightly underpower speakers than overpower themIf you mean, operate the speakers slightly below their spec'd limits (~100W?) -- agreed.
If, OTOH, you mean not having enough amplification power to meet these spec'd limits -- don't do it! Clipping can damage the drive units!
The idea being that, even if the amplifier's energy output exceeds the speakers', one probably won't play loud enough to reach thermal limits; with an underpowered amp, you can easily hit clipping!
When powered by transistors, I used to always make sure that my amps were rated to at least the speakers maximum RMS [not peak!] power rating.
When it comes to tube power, I try to get the power mid-way, say a speaker rated at 40- 100 watts RMS, I will try to keep the amp power midway [60-75 watts].
And with horn speakers or extremely high efficient speakers, more power is NOT more desirable!