2. amps-preamps
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Power and low volume listening - my imagination?

Over very many years in this hobby I've owned quite a few good amplifiers but have never used amplifiers, either tube or solid state, with power ratings greater than 100wpc. This choice was partly based in the assumption that my listening tastes include almost no high volume choices, and, therefore, did not require a lot of power. I think I have been wrong.

Because of some recent changes to my system I decided to try an experiment using more amplification. This included the use of a Peachtree Audio Nova pre amplification out to an old B&K AVR307 with about 70wpc greater than the Nova. The improvement in every way that I'm capable of judging was impressive; the bass is definitely tighter and detail in the upper mid and higher frequencies is also improved, and this is noticeable at all volume settings. I realize that this improvement may be a result of different general sonic characteristic of the two power stages and not due simply to a difference in power ratings.

This experience, though, has me inspired me to pursue a more permanent modification to my system in the form of an appropriate stand alone power amp. Now, the reason for this post and the question I'm posing has to do with power vs character. As with most advice I've asked for on this forum, any responses will be in the form of opinions but I respect them and am looking, if for nothing more, a starting point.

So, is it reasonable to assume that I need more power than what I'm used to in order to keep the improvement that I described? If so, what might be some good choices on the used market for under $1000; I've seen some that are priced right such as Peachtree 220 but am concerned that, although more powerful than the Nova, it may not sound so much different. The combination that I'm currently using as I've described here is quite nice and maybe some would recommend staying with it but, as always, it would be nice to continue down this road for yet more improvement. Anyway, what do you think?

My current system is Shanling S100 CD player, Peachtree Audio Nova, B&K AVR307 and Martin Logan Odyssey speakers.
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Showing 1 response by larryi

larryi
3,718 posts
 
Yes, there is a problem with the "all things being equal" concept--that is merely a theoretical concept and is never actually the case. In order to get more power out of an amp, multiple output devices are used and this adds another factor that makes any comparison unequal. Something is changed and sacrificed to get more power. If a particular setup truly needs such power then the sacrifice is justified, but if not, then the power reserve is wasted at the expense of some other aspect of sound quality.

Some manufacturers have gone to extremes to keep the number of output devices down for this reason (e.g., DarTzeel). Perhaps, the choice of output devices that deliver more power will also adversely affect sound quality (e.g., picking a 300b tube over a 45 tube).

I recall auditioning several Rowland amps many years ago and preferring their smaller and cheaper amp over the larger ones with speakers that did not need a lot of power. The sound of the larger amps loafing along sounded flat and lifeless. A number of factors could be at play in this case, but, comparing similar amps from the same manufacturer at least gives a clearer picture on this issue.

While I have heard only a few high powered amps on my speakers, none, tube or solid state, compared favorably with lower powered amps on my fairly efficient system (99 db/w). That has been the case with other higher efficiency systems I have heard. I find many very high powered tube amps with lots of pentode or tetrode tubes in parallel to be particularly bad sounding (brittle sounding with a lot of "glare").

In short, I would caution against a generalization that higher power will improve sound.
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