As mentioned in the above posting, eliminating resonance due to motor vibration for many Pro-ject turntables is a two-step process. The first relates to the resonance onto the plinth caused by the vibrating motor and the second relates to the resonance on the subplatter caused by the vibrating motor and transferred by the belt. In my system, installing the grommets into the suspension and replacing the belt has made a significant improvement. I ordered the rubber belt from Turntableneedles.com. The part number is RBM19.5 and is identified as a medium round belt measuring 19.5 inches selling for $16.95+shipping. The drive belt arrived today and I installed it on the RM6 SB. Unlike the Pro-ject OEM belt which is loosey goosey and flat, this one is more rigid and round. The new belt did not fit any tighter and being round should equate to less surface area on the vibrating motor pulley and the subplatter.
In my system I can confirm that the improvements were dramatic and well worth the $28 investment (grommets and belt).
I’m not a journalist, but I can describe the soundstage as having even greater clarity with the new belt. The instrument placement across the soundstage is more solid and stable. I did not notice any more bass, but what bass there is has become more articulate. The background noise has become darker during low- level passages. And what sticks out the most are the little details in the music being clearer and more noticeable now.
Good luck and happy listening
In my system I can confirm that the improvements were dramatic and well worth the $28 investment (grommets and belt).
I’m not a journalist, but I can describe the soundstage as having even greater clarity with the new belt. The instrument placement across the soundstage is more solid and stable. I did not notice any more bass, but what bass there is has become more articulate. The background noise has become darker during low- level passages. And what sticks out the most are the little details in the music being clearer and more noticeable now.
Good luck and happy listening