Unofficial Mackie User Forums > DL1608/DL806/DL32R/ProDX Mixers
channel crosstalk
WK154:
--- Quote from: RoadRanger on January 03, 2015, 11:33:24 PM ---The crosstalk between a used channel and one that has nothing plugged into it can be quite high and this is normal. Having a proper impedance device plugged in lowers the crosstalk from other channels bigtime.
--- End quote ---
I'm well aware of that hence my question about what's plugged in an of course Mackie doesn't state their test conditions.
paulfrench:
So, I've done some tests with a mic plugged in. The signal showing on the unused channel registers from -80 to about -60, and happens on most of the pairs, but not all. Also, the signal is visible, but I can't hear it. I listened with the unused channel soloed, and also muted the plugged in channel (even muted the plugged in channel was passing visible signal to the meters), and turned the plugged in channel down while cranking the unused channel. No sound from the unused channel showing "ghost" signal. Weird. It's showing on the meter, but it's not audible. So, I guess if it can't be heard, it isn't there, right? Maybe this is like the old tale "if a tree falls in the woods......." or "Currently residing in the WTF file." Hmmm.
Other than this weirdness, the mixer has been really great through 50 gigs this year.
WK154:
Let's approach this another way. You stated that you did about 50 gigs with the DL and it never was noticed before? Or you are now experiencing this recently? Without going into a rigorous test setup what have you found over your years 50 gigs that changed?
paulfrench:
Somewhere in the middle of the summer, I noticed this happening during setup. My first thought was that it was the vibrations from the keyboard player hitting his keys and the sound transferring through his vocal mic mounted on the keyboard stand. After unplugging the vocal mic, the meters were still showing low level reaction to his playing. So, I'd say I first noticed this after 20 gigs. Nothing in the setup changed in that time, other than the ideas I tried as possible solutions. ( trying new cables, shock mount for the vocal mic)
Tonight is the first time I've taken the time to explore this further. It's very odd that it shows up on the meters, but can't be heard, at least in the headphone output. I'm next going to try monitoring through the main xlr outs. I didn't have time to set that up tonight.
paulfrench:
RoadRanger, I will try again tomorrow using balanced inputs on the adjacent channels and see if that changes anything. Thanks.
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