I own a pair of these amps and was curious if I could get some feedback from anyone who sent their amps in for this upgrade and how beneficial it was. Thank you in advance.
I had the update from the Mk.3 to Mk. 3.1 done to a pair of silver edition MA-1's. The noise floor was lower and the imaging was more precise, wider and deeper than the Mk. 3. It's cheap and very worthwhile.
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