What is your experience with amp power?

I’ve been in this hobby for 40+ years and have owned many different systems.I have extremely high powered class A/B amps is my system and I’ve always owned extremely inefficient speakers that I prefer to listen to at moderate volume levels in a medium size room. Back in the day I owned a set of Thiel CS 7.2 that I tried to power  with a Threshold T400 (150 watts per channel class A amp). The speakers could play loud but lacked dynamics and sound stage. I had to use a Pass X600 to energize the speakers at moderate volume. Since then my speakers have changed but I’ve continued to use extremely high powered amps. So to answer your vague question, I believe speaker performance is highly dependent on the amp and the room. Personally, I’d use a lower powered Class A amp if I had more efficient speakers. 

Our custom tube monoblocks (75 lbs. with massive pi filtered power supply) put out about 100 watts each into our nominal 6 ohm 87dB NorthCreek crossovered B&W Matrix 801 Series 2 speakers. Our nearest neighbor’s house is about a 1/4 mile away. One day mrs. x and I were celebrating being alive with the volume knob and some of our Jimmy Buffet vinyl. A couple of days later at at the mailbox I ran into mr. neighbor who commented on how great our Jimmy Buffet concert sounded. He said he and mrs. neighbor enjoyed it with margaritas on their porch :)

The amps drive the speakers just fine.

@ghdprentice Another time I totally agree with you. If the speaker is both efficient and an easy load, I use a 30 watt tube amp on it. I disagree with @james633 My second system Signature IIIs sound equally great with either my superdeluxe voltage regulated Dynaco ST70 (30w tremendous bass), my EAR 890 (70w) or my tube monoblocks (125w)  A little sweeter sounding with the Dynaco though.

@spaceguitarist : Excellent article! My French has become almost entirely unusable (I last studied French in college almost 40 years ago), so I had to resort to the translation function, but the information was spot on. My experience with “rated power” of various amplifiers has shown this info to be true. See, we can agree! Lol. Thanks for the link. 

Using examples such as: “Amp A @ 600 w/ch sounds better than Amp B @ 150 w/ch shows that more powerful amps sound better” is an unreliable argument. It may in fact be 100% true, but is it solely due to Amp A’s higher maximum power rating? No. Also, the idea that a 200 w/ch amp plays 3dB louder than a 100 w/ch amp only holds true when each amp played to its maximum output. At any listening level below the maximum output of the lower powered amp, the output is unaffected by the maximum rated power (all other factors equal, re: input sensitivity, power supply, design, etc.). Two amplifiers using identical components, but configured differently so one outputs 200 w/ch rated power, and the other outputs 50 w/ch won’t sound different because of rated power, unless the listener exceeds 50 watts. For example: If you are listening to music and using 25 watts to achieve the volume level you desire, it matters not whether the amp in question maxes out at 50 watts, 100 watts, or 1000 watts… because you’re only using 25 watts for this level. There WILL be a difference if one amp in the comparison is designed with a stronger power supply, regardless of its power rating.