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mtrack 1\4 trs balanced inputs

hello. maybe someone knows...
''M-track'' has two 1/4 trs balanced inputs - what means ,as i understand it, that they intended for balanced mono TRS(not stereo TRS) or unbalanced mono TS plugs \cables.
When i connect a stereo source (e.g. music player: jack 3.5---jack 6.3 ) through unbalanced STEREO TRS cable into one of the "mtrack" 1/4 trs balanced mono inputs- i hear both channels, left and right...but I'd have to hear only one channel ...right? because balanced TRS and stereo TRS have different scheme....
How does it works?)
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  • Hi,
    There are indeed 2 inputs, both mono, one each for input 1 and 2.
    Balanced means there are 3 connections instead of the unbalanced 2. The main purpose is to eliminate noise by providing a reverse phase copy of the signal to be processed at the receiving end.

    Unalanced (regular RCA for HiFi / consumer electronics as well as TS for pro applications):
    Signal
    Ground/Shield

    Balanced (pro audio for mics / (powered)speaker connections, line cable):
    Signal +
    Signal -
    Ground/Shield

    When you connect a stereo unbalanced connection using a TRS connector (signal L, signal R, ground/shield) you are reversing the phase of one of the channels. I would have thought that because of any differences between the two, the sound would be nasty and fully of phasing artefacts. Either way, I wouldn't recommend it.

    Why not buy a cable like this and use it properly to record true stereo unbalanced.

    If you had the mono/stereo switch on the M-Track switched, you would hear the same thing in both outputs which might make you think it's true stereo, but really isn't. It should all come out of the left if it's input 1, or right if input 2.

    I really wouldn't get used to doing this kind of thing, plugging stereo unbalanced into mono balanced, or any other configurations when balanced and unbalanced are crossed. If you plugged an unbalanced 6.35 TS connector into a stereo unbalanced headphone socket, you could damage the headphone amp quite easily!

    Kind regards

    Foot note:
    Check out the wiki for more info, or do a search for balanced vs unbalanced to gain a better understanding of how it works.
    http://en.wikipedia.org/wiki/Balanced...
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  • My Korg micro-x has two 1/4 unbalanced outputs L/MONO & R. Don't I need a TS cable into a balun (http://en.wikipedia.org/wiki/Balun) to connect them to the balanced inputs on the M-Track?

    Thanks,

    -Peter
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  • If you wanted to connect the unbalanced keyboard outputs to the balanced inputs (XLR socket) then yeah, you'll need a converter of some sort. But why not just use the guitar/line inputs, which are unbalanced and use the TS connector type. I've yet to see a normal guitar output that is balanced!
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  • I am using the 1/4" inputs on the M-Track. Those are balanced according to the manual (http://www.m-audio.com/images/global/...) and this product description (http://m-audio.com/products/en_us/MTr...) which states: "Each channel offers an XLR input and a balanced 1/4" input."

    So I'm connecting a 1/4" unbalanced out from my Korg to a Balanced 1/4" in. The impedance on the Korg is 550ohms.

    I think i should use a TS cable coming out of the Korg and run it through something before going into the M-Track....?

    Thanks again,

    -Peter
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