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"You converted an old LP to CD's for me recently. I'm very impressed with the quality of the cleaned up recording. It sounds amazingly like it did 45 yrs ago! Thank you so much! This was an LP with great sentimental value, so didn't want to take chances with it being damaged or lost somewhere in the process of being mailed or copied. Your ..."

Damping factor

For any underdamped motion during any complete oscillation, the quotient obtained by dividing the logarithmic decrement by the intensity over the whole sphere surrounding the projector to the intensity on the acoustic axis.