Dave Potter wrote on Fri, 18 January 2008 02:32 |
XLR; pin1 screen pin2 hot pin3 opposite polarity I was recently looking at an early 80s amp which used pin3 as hot with pin 2 unconnected. As far back as I can remember (1987) pin2 was hot. A work colleague of mine mentioned that he thought that Europe had the pin2 as standard while USA was pin3 ... or it had just changed .... or something. so; When did we all agree that pin 2 is hot? |
trace knight wrote on Fri, 18 January 2008 10:42 |
I remembr back in those dayz...........some amps, i think I saw it on a carver, and a crest had a recessed switch pin 2-3 swap on the back panel, they couldn't make up thier minds I guess! tk |
John Nobile wrote on Fri, 18 January 2008 13:07 |
I'm not sure what happened at Soundcraft. I have a 500 with pin 2+ and an 8000 which came out later, with pin 3+. Any Soundcraft I've used that was newer than the 8000 was pin 2+ . Did pin 3+ become standard in England for a while? Or just Soundcraft? |
John Roberts {JR} wrote on Fri, 18 January 2008 17:39 |
I encountered customers who were extremely confused and sometimes over reacted to mixed standard situations. In some cases customers introduced a polarity reversal with their modified wiring "fix" where there wasn't a problem, thanks to the symmetrical nature of differential in and differential out interfaces. |
Lester Moran wrote on Fri, 18 January 2008 14:49 |
My KT DN 360s are "pin 3 hot". My Ramsa WRS 840 is "pin two hot", but more importantly, the individual send and return insert points on the mixes are tip=hot, ring=cold. If I present the inserted EQs with the Ramsa's hot signal to pin 2 of the EQs, I get 6 db loss, as compared to presenting the Ramsa's hot signal to the EQs at pin 3 (which introduces no loss). Do you know why this would happen?... i.e. what might be peculiar to the DN 360 balancing scheme to make it "care" whether the hot signal ran through it at pin 3 as opposed to pin 2? Thanks, Les |
John Roberts {JR} wrote on Fri, 18 January 2008 10:39 | ||
The pin hot selector switch was one way to support customers with predominantly pin 3 hot systems, while also working with pin 2 hot system. I encountered customers who were extremely confused and sometimes over reacted to mixed standard situations. In some cases customers introduced a polarity reversal with their modified wiring "fix" where there wasn't a problem, thanks to the symmetrical nature of differential in and differential out interfaces. I'm glad this is mostly behind us. JR |
Lester Moran wrote on Fri, 18 January 2008 13:49 | ||
My KT DN 360s are "pin 3 hot". My Ramsa WRS 840 is "pin two hot", but more importantly, the individual send and return insert points on the mixes are tip=hot, ring=cold. If I present the inserted EQs with the Ramsa's hot signal to pin 2 of the EQs, I get 6 db loss, as compared to presenting the Ramsa's hot signal to the EQs at pin 3 (which introduces no loss). Do you know why this would happen?... i.e. what might be peculiar to the DN 360 balancing scheme to make it "care" whether the hot signal ran through it at pin 3 as opposed to pin 2? |
Patrick Tracy wrote on Fri, 18 January 2008 17:25 |
Do I recall you saying that Peavey had settled on pin3 hot well before there was an industry standard and retained it to maintain continuity for their customers? |