Any ideas on dampening tt rumble. Its not audible, but when im listening to music, i can see the woofers moving in and out randomly.

Is it possible that its my old ass stylus

If it isnt the cart/stylus is there anything I can do?

What you're seeing is called woofer pumping. I believe clamping the record to the platter can help to lessen this effect.

Jeff

It's likely caused by one of two things:
1. Tonearm/cartridge resonance caused by a mismatch between tonearm mass and cartridge cantilever compliance. - Change the cartridge or tonearm.
2. Acoustic feedback caused by the turntable and speakers being too close to each other causing the turntable to become acoustically excited by the bass from the speakers. Move the turntable or speakers to a different location. It also might help to acoustically dampen the turntable using Dynamat or some other dampening material.

For rumble to cause this would require that the platter bearing or motor be in really bad shape. You should be able to hear rumble over a good set of headphones WITH THE SPEAKERS TURNED OFF. If you hear it over headphones it's time for major repairs or a new turntable.

Correct on all explanations.
I happen to prefer cartridges that are manufactured with an integrated damped brush. These things damp out arm resonance and also reduce problems associated with record warps.

Seth
Forever Analog

Any ideas on dampening tt rumble. Its not audible, but when im listening to music, i can see the woofers moving in and out randomly.

Is it possible that its my old ass stylus

If it isnt the cart/stylus is there anything I can do?
Well, you can rule out stylus/tonearm because you're using a p-mount cartridge on a p-mount tonearm, so that's about as good a match as you're going to get. The SL-MA1, one of the best p-mount tables, does have adjustable tracking force so it can accomodate a cartridge with a brush, but it really isn't necessary with the low mass arm. (And you'd have to buy a Shure M92E or older p-mount cart and then a separate stylus to achieve that as they no longer make a p-mount with a brush.)

Could it be recorded right into the album? Maybe a subsonic truck rumble picked up at the recording studio?

I thin so..

Also, your main bearing might need to be lubed.

Wouldn't the first thing be to clean the stylus? I was shown that a makeup brush and IPA woks wonders by a stylus/cart dealer I have used locally.

Wet the makeup bush (one of the med/large one used for powder and such) and gently brush in the same direction the record travels. I can now tell the difference when the stylus is the least bit dirty...

The arm on the SL-M1 appears to be of relatively high mass and may not be optimum for the Ortofon OM30. When Ortofon first introduced their low mass series, each model had a low compliance (LM30) and high compliance (LM30H) version. The newer OM series seems closer to the original H versions. The translated Japanese specs for the Technics SL-M1 speak of a "dynamic damping mechanism". Is there a damping adjustment to the arm?

Fernando

The arm on the SL-M1 appears to be of relatively high mass and may not be optimum for the Ortofon OM30. When Ortofon first introduced their low mass series, each model had a low compliance (LM30) and high compliance (LM30H) version. The newer OM series seems closer to the original H versions. The translated Japanese specs for the Technics SL-M1 speak of a "dynamic damping mechanism". Is there a damping adjustment to the arm?

Fernando
Fernando, this is the SL-MA1, a completely different turntable.

Sorry about the confusion. I found a picture of an SL-MA1. That arm looks like it should be compatible with an OM30. How close is the table to the speakers?

Fernando

Wouldn't the first thing be to clean the stylus? I was shown that a makeup brush and IPA woks wonders by a stylus/cart dealer I have used locally.



I'm assuming you mean isoproypl alcohol and not India Pale Ale, yes?

I'm assuming you mean isoproypl alcohol and not India Pale Ale, yes? :yes: :thmbsp:

I think it might just be time for a new cart. Mine is at least 15 years old, and i dont know how it was cared for before i got it. I cant hear the table rumbling, so i thought it was just vibrations through the stylus. Ive had it isolated totally different ways, right now its about 6 feet from each speaker, on a wood shelf, ive had it on carpet, milk crates etc...all the same.

Not to be completely pig headed but........have you tried a clamp?

Jeff

I'm assuming you mean isoproypl alcohol and not India Pale Ale, yes?
Do not use IPA on any Ortofon stylus! Alcohol dissolves the bonding agent that holds the stylus to the cantilever!
This issue was discussed in other threads in 2006.
Tom

I havent tried a clamp perse. I put a heavy nut over the spindle because of a slight warp in Young Americans, and it still did it then. Ill try it with aja.

does your amp have a rumble or subsonic filter ? :scratch2:

No it doesnt. My old monster hitachi did, but it died, and before i could fix it, it got stolen.