Question about Shure 515SBG18X Professional Microphone

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I have removed the push to talk button and replaced it with a volume pot but need a wiring diag. from the element to the pot to the XLR. Also, is it possible to wire this to convert it to high impedance? Many thanks.

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The impedance of these mics is around 180 ohms which means you would probably use a pot around 300 to 600 ohms and with an audio taper.

This is NOT a good plan from an engineering standpoint as adding impedance to the balanced mic can allow electrical noise pickup.

The only way to get high impedance is by use of a transformer or a preamplifier. You DON NOT want to run high impedance lines over any distance as they are more subject to noise pickup.

The transformer should be at the far end of the cable run from the microphone. KEEP the impeedance of the cable from the mic LOW until right before a high impedance input amplifier.

Posted on Sep 30, 2009

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I was using a 25 foot 1/4" to XLR cable from the back of the Roland directly into the Thump. As mentioned, I tried going from the Roland to a direct box with a 1/4 cable on both ends; then out from the direct box "thru"-1/4 fitting, to the XLR connection in the Mackie Thump, with a cable that had the 1/4 on one end and the XLR on the other. Still buzzing. So for grins, I hooked an XLR to XLR cable from the Direct Box Low-Z out, to the Mackie Thump, keeping the 1/4 plug going from the Roland to the Direct box and eliminating the "thru" connection from the direct box to the Thunp, (1/4 to xlr). NO BUZZ.
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In looking over the cords, I suddenly realized that the 25' 1/4" to XLR could be the problem. The 1/4" plug is STEREO! Not mono. Could this be the cause of my buzz? I'm thinking I have a stereo plug, so 2 wires are involved, yet I'm using it in a mono imput in the roland. Perhaps this is creating my ground loop?

After getting a 1/4" MONO to XLR adaptor, attach it to my XLR to XLR cord, go from the back of the Roland (1/4") to the speaker directly (XLR) and see if my buzz is still gone.
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I SUSPECT that the resistance element and/or the wiper in the volume pot is damaged. One other possibility is the soldering of a wire to the volume pot may be bad. If you are competent with a soldering iron you could replace the pot yourself or take it to a competent guitar shop for repair. I would myself suggest you open the electronics and look for anything obviously wrong. I have ALSO seen one other problem where one lead of a pot is touching the CONDUCTIVE paint in the cavity where the controls are. If the shaft nut becomes loose and the pot slightly rotates this can happen, grounding out the signal.

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If the pots are noisy, lube sparingly with CRC 226 available in the electrical dept of Home Depot in a spray can with spout for about $2.70. Spray using the spout into the side where the leads go into the pot.

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