Stanton T.90 Turntable USB Hum

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Level 3

646 points

Stanton T.90 Turntable USB Hum

I just bought a Stanton T.90 turntable and was thrilled with the USB audio interface. That was until I heard the low level hum while my iMac is recording. When I use analog connections through a USB Griffin iMic, the hum is gone. While I could an analog connection, it defeats the purpose of buying this turntable for its USB features.

Has anyone else had a problem with this? Could it be the quality of the USB cable?

24" iMac Aluminum, Mac OS X (10.5.1), 4GB RAM

Posted on Feb 3, 2008 6:52 PM

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Answer 1

Jan Hedlund

Level 7

24,235 points

Feb 3, 2008 7:11 PM in response to B. Kennedy

Often, hum is an earth/ground related issue (e.g. a "ground loop").

Are you using earthed/grounded power outlets for all involved machines?

Jan

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Answer 2

B. Kennedy Author

Level 3

646 points

Feb 3, 2008 7:25 PM in response to Jan Hedlund

I'm in a newer apartment, so I would have to assume that all the outlets have to be grounded. Everything is 3-prong.

The hum only occurs when going from Phono >> USB >> iMac.

The hum disappears when going from Phono (Line Out) >> Griffin iMic (Line In) >> USB >> iMac.

I tried to search on the internet but it doesn't seem anyone else is having this problem with this turntable.

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Answer 3

Jan Hedlund

Level 7

24,235 points

Feb 3, 2008 7:53 PM in response to B. Kennedy

The hum disappears when going from Phono (Line Out) >> Griffin iMic (Line In) >> USB >> iMac

Could it be possible that this setup interrupts a loop? For more information, see e.g. this web page.

Jan

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