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Title: Prefer this amplifier over the M22
Review: I work in a machine shop & have a constent background noise. I originally had the M12 but thought I would give the M22 a try. I ended up returning the M22 in exchange the M12 due to the volume. The M12 seemed to be louder than the M22. Would recommend this product. I gave it a 4 star because it still could be a bit louder.
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