balanced XLR patchbay with phase-reverse switches and ground lift - Page 2 - diyAudio
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Old 17th November 2011, 10:32 PM   #11
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Quote:
Originally Posted by simon7000 View Post

I can't look from work, but I sure will when I get home. Thanks.
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Old 17th November 2011, 10:44 PM   #12
JoelS is offline JoelS  United States
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Are you looking for something like this? http://www.rolls.com/pdf/M_PT102.pdf

sometimes when I do recordings with many microphones I will use something like this to check the phase of all the mics. especially when using mics that somebody else is bringing to the party, you never know if a mic is wired pin 2 hot or pin 3 hot

-Joel
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Old 18th November 2011, 02:56 AM   #13
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JoelS,
Yeah, that's the ticket!
or this:
Galaxy Audio CRICKET Polarity/Continuity Tester | eBay
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Old 18th November 2011, 03:16 AM   #14
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Unfortunately they don't make the PT102 any more.
Galaxy Audio Cricket Polarity Tester might be the only commercial product?

Last edited by cyclecamper; 18th November 2011 at 03:27 AM.
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Old 18th November 2011, 03:28 AM   #15
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http://www.youtube.com/watch?v=xZf5VkkcXQ0
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Old 23rd January 2012, 03:29 PM   #16
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What type of application would this be used in. I would assume a fixed type of installation. I would not go to the trouble of the ground lifts and phase switches on a patch bay. If it's a splitter feeding a monitor board maybe the ground lifts could be handy, having said that my hardwired split snake has ground lifts on the monitor split and I rarely have ever needed to use any of them. The only thing I ever need to ground / pin 1 lift is the occasional direct box input and I do that on the DI with it's switch. If you would ground lift anything at your patch bay you would not be able to use phantom power on that channel.
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Old 24th January 2012, 12:47 AM   #17
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I definitely agree with Mike.
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Old 25th January 2012, 01:42 AM   #18
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Yes, ground lift and polarity reverse aren't needed much except when you're interfacing with someone else's stuff. Still, often a switch makes the sonic differences so much easier to compare than using your sonic memory in a noisy environment while you rewire. It's just practical to use the optomitrist's approach: "better like this or better like this?" "again, better like this or better like this?"

This isn't for permanent installations; it's for making the best of what you've got on the spot.

You'd be surprised how many times I've gone into a high-end showroom and found channels not in correct relative polarity. Worse when live shows are using a mix of owned, borrowed and rented equipment.
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Old 25th January 2012, 01:48 AM   #19
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It's more about , the patch bay hard wiring is not the place to solve problems.
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Old 25th January 2012, 01:54 AM   #20
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What board do you carry, 50 plus percent have polarity invert switches.
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