Cardas Frequency Sweep and Burn in Record---$24.95---Music Direct
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I bought 3 years ago a used Sumiko demagnetizer and used with my at that time aging MC benz 3i, I listened closely and the first time I used it, it brought a very small improvement to dynamics. After that, I used it maybe twice over a couple years and could then hear no difference at all. I am told by my dealer that it may be best not to use one at all, and not on new cartridges, only on old ones. I do not plan on using it again.