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"I just want to say how much I have enjoyed the CDs you made off my tapes of my 78's. The surface noise is negligible on most of the tracks. The vocals are much clearer. You did a great job on restoring the high frequency on all tracks. The two songs with Bing Crosby is from an extremely warped record, you can hardly hear the distortion on the ..."

Acoustic ohm

The unit of acoustic resistance, reactance, or impedance. One acoustic ohm is present when a sound pressure of 1 dyne per cm2 produces a volume velocity of 1 cm3 per s.