Feedback Noise coming from Turntable...

[MG350]

Greetings all.... I would like to ask for some advise,

I currently have a Stanton direct drive turntable connected to an integrated amplifier and whenever I turn the volume up beyond quarter i get a massive feedback noise, like when a microphone is to close to a speaker. I tried moving the speakers further away from the TT with no luck the noise still occurs. I am grounded properly to the amp, i have isolated the TT it is subject to little or no vibration yet the noise is predominate. Previously i had a techniques direct drive turntable which had the same issue. The stereo is my father's old set from the late 70's. Originally we had a belt drive Dual TT that never had this problem connected to the same amp. My suspicion is that the direct drive is creating some sort of noise that is feeding back to the amp. I was just wondering if anyone has encountered an issue similar to this, as i really don't want to purchase a new TT and have the same problem occur. Any advise would be greatly appreciated. Thanks.

 

[highfigh]

Greetings all.... I would like to ask for some advise,

I currently have a Stanton direct drive turntable connected to an integrated amplifier and whenever I turn the volume up beyond quarter i get a massive feedback noise, like when a microphone is to close to a speaker. I tried moving the speakers further away from the TT with no luck the noise still occurs. I am grounded properly to the amp, i have isolated the TT it is subject to little or no vibration yet the noise is predominate. Previously i had a techniques direct drive turntable which had the same issue. The stereo is my father's old set from the late 70's. Originally we had a belt drive Dual TT that never had this problem connected to the same amp. My suspicion is that the direct drive is creating some sort of noise that is feeding back to the amp. I was just wondering if anyone has encountered an issue similar to this, as i really don't want to purchase a new TT and have the same problem occur. Any advise would be greatly appreciated. Thanks.

If you have a subwoofer, you'll probably never get rid of the feedback unless you move the turntable or go in to add damping material.

I have never known Stanton to make turntables- they only made cartridges in the past.

What is the weight of the turntable? If it's less than 10 pounds, it's not likely to be very resistant to this. The drive has nothing to do with the noise- it's feedback, just as you described it with a microphone. The resonant frequency of the turntable/cartridge is the one that you're hearing.

 

[Swerd]

That's classic acoustic feedback. Some frequency or frequencies coming out of the speaker are stimulating resonance from the TT or tone arm. Only one of many reasons why I don't miss LPs.

Try moving the speakers or TT to different locations.
Level the furniture holding the TT.

Turn down the bass, or turn off the subwoofer

Try putting something under either the TT or the speakers to acoustically isolate them:

Thick padding like felt
Stand the TT on top of sand in a tray
Several layers of bubble wrap
A partially inflated bicycle inner tube
… etc., you get the picture
​

Good luck

 

[Alex2507]

... whenever I turn the volume up beyond quarter i get a massive feedback noise,

If you are having any hum before turning up the volume you might try disconnecting the ground and seeing what happens.

 

[TLS Guy]

If you have a subwoofer, you'll probably never get rid of the feedback unless you move the turntable or go in to add damping material.

I have never known Stanton to make turntables- they only made cartridges in the past.

What is the weight of the turntable? If it's less than 10 pounds, it's not likely to be very resistant to this. The drive has nothing to do with the noise- it's feedback, just as you described it with a microphone. The resonant frequency of the turntable/cartridge is the one that you're hearing.

You have acoustic feedback.

The reasons are complex, and many.

The turntable may be placed in an antinode of a room egentone. So try moving the turntable.

There may be direct sound transmitted from speaker to turntable. This is common. It can come through the plinth, but the turntable platter can have a resonance and pick it up. You can order a weight to put on top of the LP this may help.

The tone arm cartridge resonance may be far too high. This can happen when using a light weight high compliance cartridge with a high mass tone arm. Matching cartridges to the tone arm is important and difficult. This is very often the cause of your problem.

The other issue, is speakers, poorly designed speakers with a high qts and boomy bass are a big cause of this problem. There are boat loads of those speakers about.

Belt drive turntables do suffer less from this problem as it is easier to isolate the platter and arm.

 

[highfigh]

The turntable may be placed in an antinode of a room egentone. So try moving the turntable.

You might consider using terms that are less obscure- 'eigentone' isn't exactly on the tip of most peoples' tongues these days. You and I know what it is, but we go back to the days of turntables and matching the compliance & mass of a tonearm and cartridge.

Many turntables from that era could be called a "feedback machine". Sony had one that weighed less than 3 pounds and for the life of me, I can't see why they even let that pile out of the barn. I remember reading that some turntables could be filled with lightweight cement, to reduce feedback.

 

[MG350]

Thanks guys for all your advise....im going to try moving a few things around and try solidifying the TT base this weekend.

 

[3db]

A DYI Isolation pad that you could build to help isolate your table.

http://www.tnt-audio.com/clinica/sandblaster_e.html