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i have the 661mk3. same scrissor-like limited signal effects and distortion as described(661 internal gain at -18db: brickwalling occurs at -7db with a 12mV/Pa (‑38 dBV) sensitivity condenser mic)..problem seems to be the preamps overloading(analog stage) with hot signals, with a -20db pad on the mic output signal, shouting in the mic > the marantz 661mk3 ...
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