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In Reply to: RE: One hard lesson, speakers are everything posted by Russ57 on January 22, 2015 at 17:23:43
Russ stated a fundamental truth. Regardless of technology, proper mating of amps and speakers is crucial to obtaining a good result.
Paul Joppa has provided the 'phile community with a useful rule of thumb, for mating amps and speakers. Joppa's Rule states that in an "average" listening space an amp/speaker combo should be capable of producing 102 dB. SPL peaks at a 1 M. distance. Even if the Denon speakers are honestly rated and "tube amp friendly", they are not suitable for use with any amp you can make using the "iron" already in your possession. To make matters worse, many commercial speakers need to be rerated, when combined with tubed power amplification. A nominal 8 Ω speaker that exhibits substantial dips in its impedance curve, especially in the bass region, has to be treated as being 4 Ω, when mated to a tube amp. Another "gotcha" is a speaker that is 4 Ω and rated at nn dB. for 2.83 V. of drive needs derating by 3 dB., as 2.83 V. into 4 Ω is 2 W. Tube power amps, with their O/P trafos, produce the same power on all the speaker taps.
Eli D.
Follow Ups:
Thank you for that very informative reply. This is going to take some thought and planning and I'm up for it :)
Most of them are wide range and efficent. Could make the start of a good set of speakers. We all know a 6v6 guitar amp can play pretty loud.
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