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Originally Posted by Mike H I was under the impression that 110-ohm digital cable (specifically Canare DA-206) for line level analog service is not only adequate but preferable, based on comments here and elsewhere: http://gearslutz.com/board/showthrea...=digital+cable
Is that incorrect?
In service from the mic to the preamp, I mispoke. I actually have Gotham GAC-3 mic cable. However, for my information, I would be interested in understanding a little more about why the digital cable would not work here, also. Could you please explain the problem that's created with 110-ohm cable carrying a mic level signal?
Thanks,
Mike |
I'm 100% sure this is incorrect!
110-ohm digital cable, is for that, carrying signals that require 110-ohm. There is also 75-ohm digital cable for signals that require that.
The issue is that mic preamps are designed to be very at high impedence seeing a very low load. In the case of professional microphones usual impedence is normally a nominal 150-ohm load. Now here is the simple bit, you use 110-ohm cable you now have an impedence of 260-ohms. Hi impedence mics are around 600-ohms so you can see how far you have come.
One of the disadvatages is that HF roll off will happen much earlier. Usually HF roll off isn't a problem in cables up to 300 metres. The higher impedence also will affect the performance of the mic amp as it is designed to be optimum with a 150-ohm load. You need to get an electrical engineer in here to explain all the possible problems and tell you the calculations that back this up, its been several years since this was explained to me.
Long and short, you have microphones, then use decent quality microphone cable, thats what it is designed for, 110-ohm digital cable is for digital signals. There is plenty of amateur crap talked in these forums, trust that a manufacturer knows what he's doing when he describes what his product is optimized for!
Regards
Roland