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VPI Rim Drive vs. belt drive sound files

Greetings All,

About two weeks ago I installed the VPI Rim Drive on my HRX turntable. Having gone through the same frustration of getting the speed stable discussed in other threads, I ---> THINK <--- I finally have it fairly well tweaked. The difference in sound appears to be a much more focused sound stage at the expense (?) of a change in tonal balance. Specifically, the mid tomes of piano keys seems to be a bit more harsh and there appears to be a bit more extension in the very bottom octave.

As I use my turntable purely as a front end for archival capture and mastering, I have digital files of the same tracks, though the identical signal path with both the belt drive and the rim drive. If anyone has the patience to download these large AIFF format files, the link below will give you access to a few of them. I’d be very interested in getting feedback from all on both sonic differences between them as well as any suggestions to improve the Rim drive set up based on listening. If you’d like to check them out please go to:

http://clients.crossroadstelevision.com

user: dean
password: marvin
go into the “VPI RIM DRIVE TEST” folder

Cheers,
Dean
dean358
ptmconsulting
1,000 posts
 
I hear people complaining that they are still trying to get speed stability with the VPI rim drive. Is there a similar issue with the teres solution?

Do these rim drives have stable pitch/speed, or do they still require and SDS or something similar to make sure they are speed stable?

Bob
theskudra's avatar
theskudra
13 posts
 
Dean-what a great thread. I wish more people would record their comparisons not only for the individual doing the evaluating, but for others as well.
I recorded the same 10 or so tracks with my current table and also with another table I was considering buying. I used the same cartridge for both tests. It was somewhat difficult to tell the difference right away, but when I went back and played the tracks back with my Tascam, it became clear that my table was superior.
I wonder has anybody done a similar test, but with other tables? This would seem to be the only way to compare tables.
jamnperry
123 posts
 
I'm not having any speed issues with the Teres. The drive leans against the platter so the contact with the platter is different by design. It's basically 2 small footers on the outside of the motor with none inside towards the platter, forcing gravity against the platter. I can't say whether that's better than the VPI system but it seems like it would be less finicky than the fixed motor position of the VPI.
It does need a speed controller which is included. It doesn't have as fine of adjustments as the SDS, and is a little trickier to set up, but seems solid once done.
Appearance wise, looks and fits well in the motor cutout of the Scoutmaster. Only slight problem is the short motor is the only one that will work for the Scoutmaster if you plan to use the outer ring. I have mine resting on a small piece of plywood on top of the Gingko to raise the height. Was planning to maybe use small maple board but sounds fine as is. I'll experiment later, but I don't expect it to matter much.
tfkaudio
591 posts
 
I was having speed stability issues with my VPI. The problem was that the belt on the circumference of the rim needed to seat itself properly after being installed. Once seated, stability got better, but was still not perfect due to the fact that the diameter of the belt itself was not identical at all points and did not have enough "give". VPI has since changed the feet on the dual motor assembly to rubber feet, and came out with a new belt that has more give. Once you've made those upgrades, your speed stability should be excellent.

A couple of notes:

I believe VPI will supply the new feet and belt free of charge to customers with the rim drive.

I also believe the SDS is nearly mandatory for rim drive users, since the speed setting on my SDS is WELL below 60hz. (Like 59.40) If dead-on 33 1/3 can be accomplished without the SDS and WITH the rim drive, great. But I really can't see how.

Cheers.

Tom
ptmconsulting
1,000 posts
 
A couple of suggestions for those of you with belt drives but interested in getting more PRAT out of them.

If you look closely at the belt where it comes off the spindle before going back to the platter you will notice that it wobbles quite a bit. You can feel it easily with a finger lightly touching the belt. Try placing something heavy and smooth up against it to reduce this "rumble" and vibration. I bet you will hear a smoothing out and a more stable musical presentation.

Another suggestion is try using string instead of the rubber belt. You MUST have a speed controller to do this though because the width of the belt ve the width of the string will cause substantial speed differences in the platter. Use a string that does not stretch, like Rayon. This proved to be a substantial improvement over the VPI rubber belt, even with the stabilizing buffer on it.

I would love to see how much better the rim drive is over a string drive. I'm sure it would be a closer contest overall.

Happy New Year,
Bob
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