New VPI 3D Arm


At last I have the arm in place and set up - though I think the tweak adjustments are still far from done. I had in place a VPI 10.5i arm with a Benz LPS, on a Superscoutmaster/Rim Drive with Bearpaws in place of the original VPI mini feet. The rest of the system is an Ayre K1xe preamp with their phono board in place, an Ayre V1xe amp, and Vandersteen 5A speakers. I set the new 3D arm with a MINT protractor, and a Fozgometer. The arm was sent to me with a standard rear counterweight of 120 grams that included a Soundsmith Counterintuitive to ease the setup. How Nice I said to myself, however, Harry himself recommended a 200 gram counterweight because my cartridge was so heavy. The new weight was sent to me, without the Counterintuitive...when I inquired why not, it seems that the C/I wouldn't fit the larger, heavier counterweight that was needed for my cartridge. So..off I go to set up the new arm. Let me tell you the setup is the clunkiest, most time consuming, most exasperating work, I have ever tried. I just gave up after many hours, and contacted VPI to vent. Harry told me that if I oiled the inside grommets of the rear counterweight, it would move much easier/smoother....and so it did, however, I would grade it as a D+...better than the F before, but not good at all. When moving the counterweight it still gripped the tonearm make any kind of precise movement a matter of luck. Harry told me he was working on (almost done - ready to market in about a month) a new counterweight system that would permit easy fine tuning with no problems. I suggest anyone who is about to get a 3D arm to insist that the new counterweight be included with your purchase. Harry promised me one of these, and I will report on these pages when I get it and how well it works. Anyway...probably most of you want to know how the new arm sounds. I must remind you that the arm is still new and really not tweaked to the nth degree. My first album told me immediately that this arm was completely different than the 10.5i (which I think is a great arm when set up correctly). The music from the speakers with this arm is completely relaxed....that hits you in face immediately. I'm not sure I can explain it further then "relaxed". When playing Paul Simon's new album with the 10.5i, I had to strain to hear the words to the tunes....which was odd to me since Paul's prowess as a poet is hard to criticize. With the 3D arm, the words and Paul's talent is completely exposed. Instruments are much more rounded and in their own space - individually...as in real instruments playing. Right now, I would describe the low end as a bit weak, however, the cables are not broken in yet, and back end of the arm just may be too high. After all of the aggravation and hours of setup, I'm not ready to adjust anything yet...just want to rediscover my vinyl. This is a work in process, and I will post again.
128x128stringreen
Chayro.... Harry has always stood by his customers and is always anxious to help...to adjust, rectify any problem, etc.
The weight located at or around the axis for vertical travel of the arm will keep the vertical effective mass and inertia low--good for tracking warps.

But, having that mass also well away from the arm to actually increase the effective mass in the horizontal direction of movement has its advocates. By increasing the horizontal mass, the arm will resist movement from the large displacement horizontal movement of the stylus in response to bass signals (deep bass is mostly recorded monophonically as horizontal modulation). In other words the arm resists moving side to side from deep bass modulation, so that most of that movement translates to lateral movement of the cantilever (i.e., more bass). This is the theory behind the Moerch Anisotropic arm. However, high effective mass in the horizontal plane of movement would cause problems with trying to play off-center records.

Other arms with low vertical mass but high horizontal mass include air bearing arms like the one on the Walker tables. It may be this design aspect, or something else, but I've heard great bass response from these types of arms.
Dear Stringreen: Agree with your answer to Dougdeacon, in the other side the counterweight is the one that affect/contribute the less on tonearm effective mass.

Regards and enjoy the music,
R.
Regarding the weight of the counterweight.....I also have the original 120 gm weight. I can set up the arm with that one and listen. That is a project for another time. Right now, the arm sounds great so I'll just listen and enjoy. (I just played Also Sprach Zarathustra - Reinger RCA, I have had for a very long time. I never heard so much air around the instruments. ...a total joy.
By the way....SME advises loading enough lead on their rear counterweight to bring it as close as possible to the fulcrum in setting up the SME V