Question about Stanton STR8-150 Turntable

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Humming noise/ feedback

Everything is connected correctly ie. amp, mixer, decks. However, when playing records there is a humming noise and feedback from the amp/ decks.
i think this has something to do with the lack of grounding for the decks.
How can i solve this problem?

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Your mixer should be grounded by the power cord, and the decks have a seperate ground wire which connects, usually on a screw terminal, to the mixer, which provides the ground for the decks. I would try the headshells to make sure they are tight and connected correctly also make sure the power socket on the wall is earthed properly.

Posted on Dec 28, 2008

  • logik677 Sep 19, 2011

    On the STR8-150s there is no seperate grounding cable, as the decks have been redesigned from the ground up not to need this antiquated piece of hardware. There is a ground lift switch beside the power button on the underside that selects whether ground lift is present or not, depending on your power set up. If you have clean power with a good ground (3 pin style socket), make sure this is in the on position. Next, make sure that as much as possible your rca cables do not run parallel to the power cord from any device. This can cause ground hum on any set up, even one where you have a seperate groud lift cable. Consider buying some premium RCA cables with good shielding, and checking your power supply.

    Also, if you are willing to use the line output level instead of phono, you can likely get rid of this hum altogether as line impedance levels are not as subject to ground loop hum as old style phono impedance.

    The issue is not with the turntable per sey, it is in the wiring. That;'s the source of ground hum.

    If you have really, really dirty power, some success can be had by independently grounding the tone arm, but that's a stopgap solution. Really, you should probably invest in a cheap UPS to protect your gear from power spikes and dirty power.

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Now, the feedback might be coming from one of the units you have connected to the mixer. The issue could also be the cable you are connecting to your recorder. Are you recording to a computer, or to some other external recorder (CDR / DVR / MDR, etc?) - try a different cable. Also try the different outputs on the mixer - you have 2 balanced line outputs you can record directly from. Don't use the RECORD OUT line, it's an unbalanced line, and if you want a good quality signal to record, your best bet is to use the XLR outputs. However, that might be connected to your amp or something.

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