Hello! I bought a Denon DRA 75VR amp and it has a MM/MC switch on it. I found out that if I turn it to MM, which by the way is the type of cartridge I have, an Ortofon 2M Red, the speakers hum more than on the old amp. I checked and the turntable is grounded. However when I switch it to MC, it’s quieter. My question is if I can use it in MC mode. Will it cause any problems with anything?