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How Much Difference Does a More Powerful Amp Make?

When would you notice a real difference in sound quality with a more powerful amplifier?

I have a Simaudio W-7 driving Dynaudio Sapphires, and at some point, I may upgrade to Sonus Faber Amati Futuras.

My W-7 is 150 watts at 8 Ohms, and Simaudio makes the W-8 at 250 W at 8 Ohms. Would I notice any difference if I moved to the more powerful amp in a medium-sized room (14' x 22' x 8')?

The Sapphires are 89 db efficient, the Futuras are around 90 Db, but I've read that with most speakers, the more power the better.
level8skier
pbnaudio's avatar
pbnaudio
1,613 posts
 
Larry - Sand Amps ? :-) what does that make the other variant "Lack of Air Amps" Made me chuckle though.

Peter
pdreher's avatar
pdreher
1,208 posts
 
In my experience, a more powerful amp does not necessarily translate into better sound. I had Dynaudio C4's powered by a Plinius SA-102 (125 WPC), then thought I'd get more out of them moving to Simaudio W-6 monoblocks (425 WPC). Ended up being the wrong move and I sold the W-6's three days later. IMO, it's often the quality of the power that counts... not the number of watts. Based upon my experience with Simaudio & Dynaudio, I suggest you try something other than Simaudio with the Dyn's... maybe a higher powered tube amp from McIntosh (MC275), VAC or Conrad Johnson... or if you must stick with solid state, try the Plinius SA-102 class A amp, or a class A amp from Pass or Clayton.
kijanki's avatar
kijanki
4,428 posts
 
According to perceived loudness calculation

k^(1/3.5) where k is ratio of powers

your loudness will increase by 15.7%.
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level8skier OP
20 posts
 
How would someone know if they were "running out at current power usage"? Is there an easy way you can tell that an amplifier is not powerful enough for your speakers? Or does that just manifest in "bad" sound?
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