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Post by oldfartbassplayrwalt on May 14, 2020 19:04:24 GMT -5
I'm pruning down my carry bag for when (if) I go back to playing guitar in church. Instead of my heavier Mackie, I'm going to try a small mixer (Nady MM141) for two guitars, that will output a TS unbalanced line.
I'd like to plug into the TSR/XLR shared input channel in the church mixer (Behringer Xenyx 1002B), but phantom power is sent to all channels. And there is no dedicated 1/4" channel.
SOOO I worry- will a TS plug short circuit the phantom power on the church mixer? Or blow out my minimixer? I'd kind of like to avoid any kind of smoke and spectacle in church, aside from the occasional incense.
Behringer technical support is provided by some psuedo forum 'Music Tribe', and they warn about COVID19 delays; the manual says nada.
I experimented with my Mackie 1201, and found the XLR input pins had 48 volts, BUT THE TSR pins had NO VOLTAGE. That's encouraging.
But then a Behringer is not necessarily a Mackie. (pause for understatement).
Any thoughts, out side of me sneaking into the church with my voltmeter?
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Post by Peegoo 🏁 on May 15, 2020 1:56:30 GMT -5
If a TRS 1/4" jack is labeled "Hi Z" (high impedance), there will be no phantom power supplied to it. If it's in parallel with an XLR jack on a channel strip, it may have phantom power. Generally the approach when using a TS plug in a TRS jack is to insert the plug to the first 'click' (it does not get pushed all the way in). I would use a DMM and a TRS plug to check for voltage tho. That's the only way to be 100% certain.
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pdf64
Wholenote
Posts: 558
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Post by pdf64 on May 15, 2020 3:22:31 GMT -5
Phantom power is usually something like 48Vdc via a 6k8 resistor, so the Nady may have no problem with that. Their tech support should be able to confirm that. If not then make a simple TS jack (from Nady) to TRS jack (to Behringer) adaptor box, with a tip to tip coupling cap to dc isolate input from output, and a ring to sleeve decoupling cap to ensure that the balanced input works properly with the unbalanced output. Film caps, 4u7 - 10uF @100v. Wire link sleeve to sleeve.
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Post by LTB on May 15, 2020 6:12:33 GMT -5
Phantom power is usually something like 48Vdc via a 6k8 resistor, so the Nady may have no problem with that. Their tech support should be able to confirm that. If not then make a simple TS jack (from Nady) to TRS jack (to Behringer) adaptor box, with a tip to tip coupling cap to dc isolate input from output, and a ring to sleeve decoupling cap to ensure that the balanced input works properly with the unbalanced output. Film caps, 4u7 - 10uF @100v. Wire link sleeve to sleeve. Ah, noticed your 6K8 (6.8K) and 4u7(4.7uf) you must be from over the pond. Not an issue as it was the first time I ran across these differences in the 1980's Airtrans People Mover's new Motor Controller made in Europe. Kinda like it now
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