I am using a Pro-Ject RPM 4 turntable through a Marantz PM 7200 amp. Generally the sound is great but I have noticed distortion on certain passages of classical music during high registers at high volume mainly on the right channel and when voices are involved. This happens on speakers and headphones alike which makes me think it is something to do with the tonearm. Is it just a case of cleaning or replacing the stylus (although I have not used it extensively) or does the tonearm need adjusting?