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Default From RAHE article on distortion

http://www.axiomaudio.com/distortion.html#

An excerpt:

In the process of finding the amplifiers, loudspeakers, and subwoofers to
bring the pleasures of high fidelity music into our homes, we encounter
lists of technical specifications that include distortion measurements.
Distortion is considered to be any unwanted noise or deformation of the
audio signal that the device amplifying and reproducing the music might
cause. The culprits include any equipment in the reproduction chain through
which the audio signal passes on its way to becoming sound in your living
room and reaching your ears. Working backwards, this includes loudspeakers
and subwoofers, amplifiers (transistor or tube), mastering recorders,
preamplifiers, digital signal processing (DSP) chips, analog and digital
recorders, mixing boards, and microphones. It's a large subject, but for
these tests we focused on potential loudspeaker and subwoofer distortions
and their audibility with music playback, using pure tones as a "noise" test
signal.

And this:

For detecting distortion at levels of less than 10%, the test frequencies
had to be greater than 500 Hz. At 40 Hz, listeners accepted 100% distortion
before they complained. The noise test tones had to reach 8,000 Hz and above
before 1% distortion became audible, such is the masking effect of music.
Anecdotal reports of listeners' ability to hear low frequency distortion
with music programming are unsupported by the Axiom tests, at least until
the distortion meets or exceeds the actual music playback level. These
results indicate that the "where" of distortion-at what frequency it
occurs-is at least as important as the "how much" or overall level of
distortion. For the designer, this presents an interesting paradox to beware
of: Audible distortion may increase if distortion is lowered at the price of
raising its occurrence frequency.


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