Continuing to listen after the 3.16.2 update and it is such a nice improvement that I am wondering if all M33s were compromised by the tone controls being always in the circuit ( I assume that is the issue as noted by Audioexpress review and my own experience). I would suggest it had to be all M33s. If that is the case all the reviews were made on handicapped units. Mostly really good reviews, but since an old set of ears like mine observed a very noticeable improvement after the fix the reviews would have been better without the tone control handicap.
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