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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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