Official Pro-Ject Fix For Turntable Rumble Now Launched

[steffner]

I know there was talk earlier on in this thread about replacing the motor in these turntables. I'm getting ready to do it and i'll let you know how it goes. I attempted to contact Sumiko 2x concerning this issue with no reply. What I wanted to know is if it's possible to replace the motor in the Pro-ject XpressionIII with one from a Music Hall 2.1 (spare from previous turntable).

The reason for this is that I tried all the previously mentioned methods and still got some rumble. But mine was coming from the motor itself. I pulled the motor out and held it in my hand and turned it on and the motor was vibrating something fierce. I manually turned the spindle and it wasn't smooth at all which leads me to believe that it is the motor itself (along with the mounting). I'll put the other motor in and see how that goes.

Stephen.

[Garven]

steffner,

Your description of the motor vibrating is very much my situation too. In fact I've found that any of the methods where the motor and bracket are allowed to vibrate freely, no matter what kind of suspended mounting, sorbothane grommets, blu-tack, etc., results in more resonant noise than firmly securing the bracket with transit screws. Adding blu-tack between the bracket and the plinth when screwing it down seems to help dampen and direct resonance transmitted from the motor, but it's still there. My motor vibrates quite a bit when I hold it and also does not turn smoothly when I turn the spindle manually. I actually just ordered a new stylus for my cartridge and will be talking to my dealer when I pick it up, so I may price a new motor at that time.

So I'm curious to hear how your motor change turns out.

[steffner]

Garven:

I completed the motor replacement last evening. I did take pictures and will post them when I figure out how. Anyway, the replacement was pretty easy. There are only 4 wires to solder up and I was able to do it without cutting any of the original motor wires (just in case). The hardest part was getting the height right on the motor pulley. If it was too high it would rub on the platter and too low and it would bind in the motor housing. The operation is smooth with no physical vibrations coming from the motor itself. How this will translate to any plinth transfer is anybody's guess.

So tonight I was able to check on the timing and it seems correct with my strobe. I'll have to wait until tomorrow night to test the rumble out when hooked up to an amplifier. (I have a 4yr old which kinda limits what you can do after he goes to bed). I'll write more about the sound 'benefits' then.

Anyway, the replacement Music Hall 2.1 motor is pretty much identical to the stock one. They are both 16v motors. The only difference is that the Pro-ject motor has a yellow sticker on the bottom whereas the Music Hall had a little one on the side.

[Garven]

Great! I'm looking forward to your impressions.

[Chuckstar-uk]

How tight are you supposed to tighten the new mounting screws? Are they supposed to be loosely screwed down but so that the new grommets are not deformed or screwed to the point that any further turns would be obviously over tightening but enough that the grommets are squished?

[Kernow]

I'm planning on buying this upgrade soon for my RPM4, but maybe not if it looks like I'll be paying £30 for two rubber gromets! Can anyone confirm you do actually get a different pulley and belt still with the UK upgrade kit?

[Kernow]

sod it, just bought one.

[Kernow]

arrived, time to split some sorbothane blobs!

[Kernow]

Took me a bit longer than the fabled ten minutes, mainly because whenever I fitted the belt it'd pull the motor off center. It definitely sounds better though... I think.

[Kernow]

Few more hours listening, this upgrade is worth every penny, really upgraded my RPM4 significantly.

[Hazuki]

I'm surprised that no one seems to have tried the Herbie's dampers on the tonearm base and the platter bearing housing, nor the Audio Additives damping sheets on the underside of the plinth, such as I described some time ago in regards to my MMF-2.2. In fact, I've been able to reduce the number of the arm dampers to just the one large one on the base.

[Vorig]

Anyone know how to get this in the U.S.? I want it for my Debut III. Do I need the 50hz version or 60hz?

[ejk]

Anyone know how to get this in the U.S.? I want it for my Debut III. Do I need the 50hz version or 60hz?

In the U.S. its 60 Hz. Give these guys a call. Got mine from them



http://www.audiotwo.ca/

[Vorig]

Thanks. So just to confirm, Pro-ject has resolved the faulty timing issue with the 60hz band/pulley? Earlier posts on this thread indicated that the 60hz version was discontinued due to timing issues.