pinwa
IF many LPs sound ’right’, you do NOT need to change the connectors on your Tonearm. No 1K prominence on many LPs, just some Rock, makes no logical sense.
I have that VPI junction box, mini-din in, RCA out. VAS rewired my tonearm. I like it a lot except it’s price, but over time ....
To use it, you need to change the connector on the tonearm wires (which evidently are NOT a problem now).
KISS, you could buy a returnable MC Phono EQ from Amazon, use it to ’prove’ it is the current phonostage, and to prove your cartridge/arm/cable are not the culprit.
This brand may not be respected, but it has variable settings, find answers, return it