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Post by Johnkenn on Jul 16, 2015 12:14:49 GMT -6
Shouldn't I be able to plug my 84 into a patch then come out of that on the patchbay and into a pre...and then still run phantom power?
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Post by 79sg on Jul 16, 2015 13:05:01 GMT -6
Yes, you would definitely want to make sure that phantom power is turned off when patching, I would use an XLR patchbay and be sure to never plug in a line level device into that patch with phantom power. SOS wrote an article about this: www.soundonsound.com/sos/dec99/articles/patchbay.htm |
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Post by Johnkenn on Jul 16, 2015 13:10:49 GMT -6
Weird...can't seem to get it to work.
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Post by 79sg on Jul 16, 2015 13:16:06 GMT -6
what type of patchbay are you using? Is it normalled (full normal)?
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ericn
Temp
Balance Engineer
Posts: 16,107 
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Post by ericn on Jul 16, 2015 14:44:21 GMT -6
Shouldn't I be able to plug my 84 into a patch then come out of that on the patchbay and into a pre...and then still run phantom power? Your still using a Generic 1/4TRS , right ? Then no don't ! |
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Post by Johnkenn on Jul 16, 2015 16:28:33 GMT -6
Ah...That explains it. Man, I just don't want to spend $500 on a patchbay.
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Post by svart on Jul 16, 2015 16:52:26 GMT -6
You should have no problem with a full normal trs patchbay. 1/4 trs doesn't keep it from working at all. Every decent design has current limiting resistors on the phantom on each channel of preamp which keep the phantom from completely shorting and dying when being patched. Many old consoles had their preamps patched through 1/4 or bantam bays.
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Post by svart on Jul 16, 2015 16:54:05 GMT -6
I also bought all my bantam patchbays used on eBay. Didn't pay more than 50$ for any of them, including a 144 point switchcraft.
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Post by Johnkenn on Jul 16, 2015 17:18:22 GMT -6
I'll have to look at how I set it up...Maybe I have it in half normal. I don't thing the way I have it set up is the "proper" way...I go mic straight in the to the back of the patchbay, then out of the front into the patchbay/pre I want to use...
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ericn
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Balance Engineer
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Post by ericn on Jul 16, 2015 17:24:50 GMT -6
You should have no problem with a full normal trs patchbay. 1/4 trs doesn't keep it from working at all. Every decent design has current limiting resistors on the phantom on each channel of preamp which keep the phantom from completely shorting and dying when being patched. Many old consoles had their preamps patched through 1/4 or bantam bays. No but the grounding in those Cheap Generic Made in China bays is the problem! It can be done but it is beyond what JK would feel comfortable with as Far as DIY! Yes a real bay would make it easy but we have been here before, John would need somebody else to wire it up! eBay is a great place to buy cheap bays if you know how to trouble shoot and have basic solder Skils ! |
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Post by 79sg on Jul 16, 2015 18:09:33 GMT -6
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Post by jimwilliams on Jul 17, 2015 9:40:55 GMT -6
Don't do that. I found out the hard way in the early 1980's. Contact corrosion and poor mating causes noises and grit from patch points as the signal is a measly 5~20 mv. It's not line level folks.
If you patch with phantom on you will also get sparks, those could damage the mic or the preamp. Yes, someone will forget and do that.
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Post by Pueblo Audio on Jul 17, 2015 10:12:06 GMT -6
It is possible to run phantom through patch bays. Actually it is alarmingly common in established studios and stages.
But there is no valid technical arguement that can be made in favor of such a practice. There is everything to loose and nothing to gain.
Especially in a project studio environment there is no reason NOT to choose the best interconnection: mic -> a homerun mic cable -> preamp. That will harvest the best signal quality while avoiding the possiblity of permanent damage/ alteration to equipment performance. Pueblo preamp inputs are designed to shrug off an infinite number of phantom power casualties but most audio equipment I know will not. One may not realize the hits they took. Equipment may still continue to function, but beacuse of a phantom "injury" they may no longer operate to factory specs.
Avoid patch bays for mic level work. Just use a single xlr cable and be done. Simple, cheap and just plain mo' better.
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Post by Johnkenn on Jul 17, 2015 10:57:21 GMT -6
It is possible to run phantom through patch bays. Actually it is alarmingly common in established studios and stages. But there is no valid technical arguement that can be made in favor of such a practice. There is everything to loose and nothing to gain. Especially in a project studio environment there is no reason NOT to choose the best interconnection: mic -> a homerun mic cable -> preamp. That will harvest the best signal quality while avoiding the possiblity of permanent damage/ alteration to equipment performance. Pueblo preamp inputs are designed to shrug off an infinite number of phantom power casualties but most audio equipment I know will not. One may not realize the hits they took. Equipment may still continue to function, but beacuse of a phantom "injury" they may no longer operate to factory specs. Avoid patch bays for mic level work. Just use a single xlr cable and be done. Simple, cheap and just plain mo' better. Thanks! Great to have you here, Pueblo Audio. I've heard your preamps are fantastic. Feel free to start a post introducing them to all of us! |
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