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Neutrik TRS Jacks with non-TRS cables

If you plug a TS (aka Tip/Sleeve or mono) plug into a TRS (Tip/Ring/Sleeve or stereo) jack, the Sleeve (sometimes ground/shield, sometimes not) on the plug contacts the Sleeve and Ring on the jack. In most cases you can just leave the Ring contact on the jack disconnected, or you can connect it to ground.
This applies only to low level signal connections like with instrument cables or effects loops.
BUT DOES NOT ALWAYS APPLY TO SPEAKER CONNECTIONS.

You need to be more careful with speaker connections because not all Sleeves are at ground potential.
On some amps they carry voltages above ground that can be a shock hazard.
 
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