2. amps-preamps
  3. 1227364883

Pin declaration of balanced input / output XLR

I need assistance in some clarification;

I tried a pair of MBL's 9008 A mono blocks in my system recently and did not like the sound. I had them hooked-up to my Audio Research Ref3 pre in balanced configuration, XLR. When I pushed the button on my remote "INVERT" I preferred the sound.

I just recently found out that MBL's XLR inputs pins are differently configured then my AR.

Pin 2 on the MBL XLR is Inverting and on my AR it is Non-inverting.

By pushing the "INVERT" button on my pre is this correcting this phase issue properly.

I asked about just swapping the cables and was told this would not work properly.

My understanding is to correct this I should just have an IC with one end which would be connected to the amp re-terminated. Swap Pin 2 which is Inverting to Pin 3 which is Inverting, is this correct.

I would assume the MBL pre-amp XLR outputs would be the same then so if connecting to any non MBL gear you would need to do this also or you run into phase issues.

dev

Showing 1 response by atmasphere

atmasphere's avatar
atmasphere
11,577 posts
 
Dev, I think you will find that the invert switch does not do what you want all the time- the reason for this is that about half of all recordings made are out of phase. There is absolutely no reason for concern about the equipment with the switch in either position.

FWIW, the industry standard for XLRs is: Pin 1 ground, pin 2 non-inverting, pin 3 inverting.
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