No, I'm not certain what the settings are actually doing on the 955v2, just that initially it was advertised that you could bring TX/RX out to 4k. Could be that it's more of an EQ - which I personally would still like to have.
I've been using Amateur HF transceivers & SDRs for years so I much prefer a fuller/wider receive than what most of these
Qixiang radios have. The RX audio on these radios (not just the 5555 NII, but similar exports) sounds "thin" and obviously lacking in low-end.
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Anytone states N II SSB receive is 450-2500hz. That'd explain what I'm hearing.