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In Reply to: RE: A funny story about square wave test on speakers posted by beppe61 on December 13, 2014 at 23:34:18
I don't know about who dismissed it, but the square wave test has been used as a speaker test for years - most of the time it looks not very much like a square wave, though by how it reproduces it, might give some ideas about driver integration, time and phase alignment.
I know the Quad ESL63 and later models based on the same, used the near perfect reproduction of the square wave as marketing for their speaker's accuracy.
I pasted, above, first the Stereophile measurement showing the Quad ESL63
Most speakers do not show something this well. I think many show the impulse test since you can see how well phase/time aligned the speaker might be.
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Follow Ups:
Hi and thanks for the interesting information
I wonder if this test can tell something or not about a driver quality
I know that a square shaped signal does not exist in nature
But still SW is quite used for instance in circuits testing.
Kind regards,
bg
A square wave, mathematically, is the sum (superposition) of an infinite :-) number of sine waves -- the fundamental frequency plus, at appropriate amplitudes, all of its odd-order harmonics (on to infinity!).
Reproducing one with an amplifier is hard enough, to ask a loudspeaker to accurately reproduce all of that harmonic content, all at the correct amplitude(s) and in phase, in a real acoustic environment is essentially impossible. There's a problem!
Still, evaluation of square waves reproduced by speakers can, I think, give some insight into transient response, linearity, and maybe also harmonic distortion properties of the loudspeaker.
And, yes, some loudspeaker makers, over the years, have published their wares' square wave performance -- it's rarely pretty.
all the best,
mrh
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