I am a recent purchaser of a CA-7 and PA-7 combo. My previous amp was a Nakamichi TA-4A. The speakers I’m running are not known for their bass output. (Avalon Avatars) If anything, I’ve found improved bass and greater all around detail with this combination. I think the seller does not know what he’s talking about.
The CA-7 has an amazing phono section and I’m told the same holds true for the CA-5 & CA-5II.
My only complaint about the CA-7 would be that the OEM remote feels delicate. (Mine had a crack in the IR window plastic) You’re not stuck to that remote as the Harmony remote system supports the CA-7.