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One of the most asked questions we get is... Is there a difference between XLR and DMX cables? Can I use a DMX on an XLR product and vice versa?

The sinple answer is yes there is a difference although at a pinch you could use one for the other but we definitely wouldn't recomend it!

Whereas the USITT requires a 5 conductor cable, 3 is common. There are substantial differences, critical even, between digital DMX cable (RS-485) and standard audio mic cable. The two critical differences are in the impedance of the cable and the sheilding.

DMX cable is 110 or 120 ohm whereas standard audio cable is 70 ohm. Also, because it is a balanced digital cable (where pin one is NOT tied to the sheild and connector housing) you will typically find the data conductors (pins 2 & 3) twisted, just like in an ethernet cable. This is done to provide common mode rejection where noise reaches both conductors equally but in opposite phase and is therefore cancelled. There is also a "drain" conductor, then typically some outer sheilding (foil, braid or both).

You can use a standard audio cable, and it will work (sometimes), but it is CLEARLY not recommended. The noise inducted, or interference acquired by inadequate cable can permanently damage fixtures, particulary the demuxer chips. I have seen this too many times to recount. Further, the impedance issue causes data reflections, which at best case are annoying because your fixtures do weird things and at worst again cause fixture failure.

It's NOT worth it. Don't drink your Starbucks the day of the gig, use the savings to buy the right cable from London Speaker Shop

Miking Up Instruments and Bands

To mic up a Rhythm section click here.

Equalisation & Feedback

To read an interesting article on equalisation and feedback click here.

 

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