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Turntable Thrumming

I'm a new member and have been following the forum for a while.  It's a pleasure to read the learned insights of the members and get information on a wide range of subject matter.

 

I recently bought a Pro-Ject X2B turntable and am generally pleased with its performance.  But I've noticed a low thrumming sort of sound.  Not really a hum or a rumble, just a low frequency low cyclic rate sound.  It's not very loud and only discernible during quieter passages of music or between tracks.  The turntable sits on a very heavy acacia wood table.  Any thoughts on the source of this sound?  Also, any advice on record weights and better feet for this turntable?

 

Thanks,

John Cotner

New Ulm, MN 

jrcotner
ghdprentice
7,019 posts
 

What is the frequency of the noise? Is it 33.3 one per turn of the table?

ossicle2brain's avatar
ossicle2brain
129 posts
 

Welcome aboard John.  Have you tried turning off the motor and seeing if it stops?

Getting a test record really helps with this stuff.  It will have a track of unmodulated grooves that's made just for checking stuff like this.

It could be the motor or the belt or just groove noise.  In between tracks it sometimes goes up it seems until there is some music information.  Try taking the belt off and spinning by hand with motor off.  

 

jrcotner OP
68 posts
 

Thanks for the info.  The noise seems to be around 0.5 Hz.  The sound is gone when the motor is off.  I'll try removing the platter and belt to see if the noise is associated with either of those.  And a test record should be on my wish list.

noromance's avatar
noromance
9,810 posts
 

Clean (and inspect for anomalies) the belt, platter, and pully with alcohol. Remove perspex lid if applicable. 

three_easy_payments's avatar
three_easy_payments
2,097 posts
 

The noise seems to be around 0.5 Hz. 

Do you mean 0.5 khz? Humans can't detect sounds at 0.5 hz.

 

 

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