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Using the monitor output my PA Mixer, Yamaha EMX66M, to a Sterling S104H headphone amp via a TRS cable, I am only getting sound in one ear. The mixer is mono, so I assume the monitor out isn't capable of a dual-mono - or maybe my cables were just messed up (need to toy some more). Assuming this behavior is expected because it is a mono output, how can I rectify this?

  • Are you sure your mixer isn't stereo? It seems to have two graphic EQs (maked GEQ) on the front and two 'Master' knobs. Which output are you connecting to? – Schizomorph Jan 2 '18 at 16:06
  • manualowl.com/m/Yamaha/EMX66M/Manual/153058 mono output needs mono jack & mono receiver or bridge. a TRS will feed only one side of a stereo amp. – Tetsujin Jan 2 '18 at 16:22
  • @Tetsujin - worth posting that as an answer, I reckon – Rory Alsop Jan 2 '18 at 17:55
  • @RoryAlsop - had a quick attempt, not seeing any easy 'amazon' type links for a quick adaptor solution... maybe my terminology doesn't match 'consumer', but idk what else to call a bridge to mono ;) – Tetsujin Jan 2 '18 at 18:04
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It's a mono output jack, so needs a mono jack, or preferably TRS with bridge, if you're going to a stereo headphone amp.

A regular TRS > TRS will arrive at the headphone amp as one side of a 'stereo' feed, so will need bridging to provide dual mono. You can buy jack converters that will do this, or with a soldering iron, connect left & right, leaving ground as is.

Ref: https://www.manualowl.com/m/Yamaha/EMX66M/Manual/153058

Additional ref - Stereo and mono cables and jacks? What happens when you cross them?

  • Great, that's what I was thinking. Would you mind linking such a bridge product? I am unfamiliar and don't want to buy the wrong thing haha. – Kerry Ritter Jan 2 '18 at 18:51
  • I'd really be tempted to say, go to your local Maplins/Radio Shack & tell them what you need. Googling 'stereo to mono jack' doesn't guarantee it will bridge properly. Your headphone amp will have a true stereo TRS socket & I'm not certain it will bridge correctly if you insert a regular mono jack; I'm betting it would connect Right to Ground, not Left to Right. – Tetsujin Jan 2 '18 at 18:59

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