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In Reply to: RE: Just so we are clear- class A is the lowest distortion class of operation posted by morricab on July 5, 2016 at 07:51:05:
Quote :"" is still the speakers. Can y'all say "10 percent harmonic distortion"? (Oops, there's another can o' worms!)"
Mostly low order and mostly in the bass where the hearing is far less sensitive. Probably makes the sound "fuller" than one without it."
And that's why bass controls turnover at 100 Hz if you're lucky. They figure if you want more bass you want that tubby tone. Not me. Most rooms cancel out the lowest octave, it is that which needs to be boosted. What's more, a sealed cabinet is much better, even though it will inherently have less bass usually, the low end is not rolling off as fast.
The method of summing the output of the port and the woofer close miced does not give reliable results. They are not in phase. From what I have "heard" even the best of them suffer in a small room because to have to give them room to shake the air.
"With speakers it is still the problem with materials creating bending and breakup modes, storage and release of acoustic energy etc. rather than actual harmonic distortion from the driver non-linearities (they have gotten this part pretty good over the years). "
In other words, rattling. Just not rattling really bad right now. But you are right. Other distortion generated by the motor of the speaker should be pretty much gone now. In the old days they never expected the cone excursion of today. If they wanted bass they had to use a 15" woofer, some of the 8" of today can outdo them on low bass. And I do not mean one note resonant cavities, I mean something like a Boston Acoustics
A-70. And plenty others. I had the chance to audition a pair of Canton 10" three way system. I could not afford them at the time. The Bostons came closer than any other speaker I heard so I got those. Sealed system.Anyway, IIRC the Boston A-150s were 0.7 % THD at 1,000 Hz. Of course that is not the bass region but then any THD spec on a speaker is pretty rare. I do seem to remember that Quad ESL63s are rated very low in distortion and I mean less than alot of amps. I also wonder how the hell they measured it.
Edits: 07/14/16
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- RE: Just so we are clear- class A is the lowest distortion class of operation - JURB 22:51:03 07/14/16 (0)
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