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PreSonus M-80 meters misread low frequencies

Just a note of caution to all M-80 owners, the meters on my M-80 do not read correctly for frequencies below 200 hz. I have noticed this on two other M-80's in our area and I am wondering if they all do this? To test you take a test tone oscillator and feed the M-80 a 1 khz tone at 1 volt, adjust the gain to read 0 db on the M-80.

Thoughts on M80 or Precision 8

I recently purchased an M80 mic preamp but have not yet received it. What should I expect? this is a used unit with the "Jensen" transformers. Is this a pretty good pre for general purpose. I'm tracking through my D8B right now. Will it be much of an improvement? I also ordered an RME AD8 Pro to use as converters. I would also like some feedback on True Systems Precison 8.

Thoughts on M80 Mic Pre

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I recently purchased an M80 mic preamp but have not yet received it. What should I expect? this is a used unit with the "Jensen" transformers. Is this a pretty good pre for general purpose. I'm tracking through my D8B right now. Will it be much of an improvement? I also ordered an RME AD8 Pro to use as converters.

Thanks to all Abraham.