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Very low frequency distortion is perceived “inflated,” based on Fletcher-Munson as updated in ISO226:2003. For example in the chart (transposed as Equal-SPL contours), at 30Hz a typical mid-quality SW measuring 3% THD sounds like 25%; like 10% at 60Hz. The harmonic artifacts generated, mostly by...

First may I commend this site and its founder\admin for a fine service to several audio communities, ranging from newbies to audiophiles to professionals. I myself am in the latter category – a professional audio engineer since 1958 (my first paying gig after graduating RCA Institutes, and...