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Post by dlaunde on Aug 13, 2020 9:53:34 GMT -5
What is the stance/implementation of pin 1 on the XLR pinout for amplifier builds? How does Emotiva handle it?
From reading around the Internet, it seems like pin 1 is supposed to be connected to the chassis and not to the circuitry of the amplifier module. In my case, I am using Hypex modules. But the pre-made cable harness I got connects XLR pin 1 to the Hypex circuit board. So what is the right method? What does Emotiva do with pin 1?
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Post by repeetavx on Aug 13, 2020 10:31:03 GMT -5
We don't use locking XLR connectors on our XLR compatible amplifiers because they (locking XLRs) tie into the amp's audio ground, which can cause or induce ground loop hum. Our XLR outputs are isolated from the amplifier's audio ground, thus minimizing one area where ground loop hum could become an issue. Oh my.. I don't believe this was an actual response from Emotiva.  Pin Function 1 Chassis ground (cable shield) 2 Positive polarity terminal for balanced audio circuits (aka "hot") 3 Negative polarity terminal for balanced circuits (aka "cold")[15] The grounding pin (1) DOES NOT INTERFERE with the locking tab. Each pin is isolated.  Emotiva is essentially saying audio amp manufactures like Crown, Crest, QSC, Lap Gruppen and Highend AV manufactures like Mark Levinson have been selling inferior amplifiers to consumers for years because they use locking XLR. According to Andrews replay "(locking XLRs) tie into the amp's audio ground, which can cause or induce ground loop hum", the amps from the companies I mentioned should be humming and buzzing away like crazy.   Hi I didn't necessarily see the answers to all of these in the other thread so will ask here so we can get a definitive baseline? - Are all the XPA-? Gen 3 amps wired the same wrt XLR ins ie Pin 3 is hot? - Which pin is hot on XSP-1 Gen 2 XLR ins and outs? Is it pin 2 or 3? - Which pin is hot on RMC-1 XLR ins and outs? Is it pin 2 or 3? - Others? Thanks —Confirmed by Emotiva, ALL Emotiva amps of any generation have their XLR inputs wired with Pin #3+ ( the signal’s phase will be reversed by the amp) —Confirmed by Emotiva, ALL Emotiva preamps and processors have their XLR outputs wired Pin #2+ ( the signal’s phase will not be altered) —Confirmed by Emotiva, ALL Emotiva preamps and processor have their XLR inputs wired Pin #2+ ( the signal’s phase will not be altered) — Confirmed by Emotiva, ALL Emotiva products are non-inverting through the RCA connections ( the signal’s phase will not be altered) I believe this now answers the phase questions regarding the balanced/XLR inputs and outputs on all Emotiva devices (and now RCA). |
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Post by dlaunde on Aug 13, 2020 10:43:22 GMT -5
Thanks, so that would confirm the correct wiring is to connect pin 1 on my XLR chassis connectors directly to the chassis to ground it? |
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Post by dlaunde on Aug 13, 2020 10:46:26 GMT -5
This is the Neutrik connector I am using. Can I simply jumped pin 1 to the metal tab on the connector as shown? My understanding is the tab is there for easy grounding....or should I hook pin 1 directly to chassis just to be sure?
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DYohn
Emo VIPs 
Posts: 18,348
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Post by DYohn on Aug 13, 2020 10:50:16 GMT -5
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Post by repeetavx on Aug 13, 2020 10:52:59 GMT -5
Between ground loops and cold connections, I would check to see if the chassis is really grounded. If yes, then nothing beats a purposeful direct connection.
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Post by dlaunde on Aug 13, 2020 11:23:51 GMT -5
Thanks all!
I'm putting the amplifier together now. It's a custom made case and the modules and I'm doing all the wiring so I can confirm that the chassis will be connected correctly to mains ground. I'll hook pin 1 of my XLR connectors directly to the chassis.
Thanks again!
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Post by AudioHTIT on Aug 13, 2020 11:30:56 GMT -5
This is the Neutrik connector I am using. Can I simply jumped pin 1 to the metal tab on the connector as shown? My understanding is the tab is there for easy grounding....or should I hook pin 1 directly to chassis just to be sure?
On XLR cable connectors, the ‘tab’ you refer to is for the ‘drain’ connection. Depending on whether you have braided or foil shielding in the cable, it is sometimes used. I’m being vague because if you google it you’ll find some say “connect it at one end”, “connect it at both ends”, or “don’t connect either end”. I connect one end on cables I make by jumping from pin 1 to the drain tab (I use foil shield). However if your tab connects to chassis ground, it may as you say it may be a convenient place to ground the connector to the chassis. If continuity shows that’s the case (or chassis  , it does seem useful. |
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Post by dlaunde on Aug 13, 2020 11:41:15 GMT -5
This is the Neutrik connector I am using. Can I simply jumped pin 1 to the metal tab on the connector as shown? My understanding is the tab is there for easy grounding....or should I hook pin 1 directly to chassis just to be sure?
On XLR cable connectors, the ‘tab’ you refer to is for the ‘drain’ connection. Depending on whether you have braided or foil shielding in the cable, it is sometimes used. I’m being vague because if you google it you’ll find some say “connect it at one end”, “connect it at both ends”, or “don’t connect either end”. I connect one end on cables I make by jumping from pin 1 to the drain tab (I use foil shield). However if your tab connects to chassis ground, it may as you say it may be a convenient place to ground the connector to the chassis. If continuity shows that’s the case (or chassis , it does seem useful. Ahh, that makes sense. Thanks! I just made a simple hookup to the chassis baseplate that I'll connect pin 1 to, just to be sure. Putting it all together now. Excited. Always fun doing DIY stuff |
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Post by ttocs on Aug 13, 2020 12:05:43 GMT -5
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, it does seem useful.
