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Based on the CM7777 samples I have here, one purchased in the fall of 2012 and one in the fall of 2015, it appears that CM has changed the internal design of the 7777 by adding additional inter-stage attenuation to reduce overloading. This newer sample showed a total gain of about 24 dB instead of the advertised 30 dB.
I emailed CM about it since the product no longer matches their marketing specs but I never received any response. Go figure...
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