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Re: Decklink Studio, Mixer, Y cable?? PLEASE..

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Nick Stephens
Re: Decklink Studio, Mixer, Y cable?? PLEASE..
on Dec 14, 2011 at 6:57:20 am

Hello Tony,

The distortion you are experiencing is because you are only getting half the waveform (the positive half with respect to ground). The other half effectively becomes a square wave (which never sound nice).

A balanced signal consists of 3 wires:
1 - Ground (Sleeve on TRS)
2 - Positive signal with respect to ground (Tip on TRS)
3 - Negative signal with respect to ground (Ring on TRS)

If you plug a balanced signal into an unbalanced input you will often only be terminating the Tip and the Sleeve (Ground & Positive with respect to ground).

What you need to do is connect a short link wire between the Ring and the Sleeve, effectively combining the negative signal with respect to ground, to ground.

Some unbalanced 1/4" sockets mechanically connect Ring and Sleeve, but not all, sound like yours do not.

Bear in mind that this effectively "unbalances" your entire input cable so you lose all the common-mode rejection advantages of a balanced signal. Depending on the signal level, length of your cables and environment, this could be a real problem.

I suggest you get a better mixer that helps you keep everything balanced. A good quality, low cost mixer is the Allen & Heath Zed 14 which also has an internal USB audio interface. Great for getting audio in and out of your PC!

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