Hi Michael,
That's really strange. I took a look at some rear panel photos of the EMC-1, including the -UP and MkIII versions as well as the no suffix version. The XLR connectors appeared to be standard 3-pin male XLR's, as would be expected for outputs. In most cases a pin diagram for the XLR connectors was marked on the rear panel, which showed the standard convention used in the USA and many other countries of pin 1 = ground, pin 2 = +, pin 3 = -. The physical locations of the pins that were depicted in the diagrams properly corresponded to the indicated pin numbers.
The only possible explanation I can think of for why you got no sound using a standard cable is that the connectors were not wired per the diagram, but were miswired with pins 1 and 2 swapped (a mistake that's not hard to make, because those pins are symmetrically located), AND the design of the unit was (as is sometimes the case) such that the signal on pin 3 is generated by an inverter stage whose input is the signal that is applied to pin 2. In that situation both signals in the balanced signal pair could very conceivably have been forced to 0 volts (i.e., grounded) when the CDP was connected through a conventionally designed XLR cable to a preamp having pin 1 grounded per the standard pin convention.
Best,
-- Al
That's really strange. I took a look at some rear panel photos of the EMC-1, including the -UP and MkIII versions as well as the no suffix version. The XLR connectors appeared to be standard 3-pin male XLR's, as would be expected for outputs. In most cases a pin diagram for the XLR connectors was marked on the rear panel, which showed the standard convention used in the USA and many other countries of pin 1 = ground, pin 2 = +, pin 3 = -. The physical locations of the pins that were depicted in the diagrams properly corresponded to the indicated pin numbers.
The only possible explanation I can think of for why you got no sound using a standard cable is that the connectors were not wired per the diagram, but were miswired with pins 1 and 2 swapped (a mistake that's not hard to make, because those pins are symmetrically located), AND the design of the unit was (as is sometimes the case) such that the signal on pin 3 is generated by an inverter stage whose input is the signal that is applied to pin 2. In that situation both signals in the balanced signal pair could very conceivably have been forced to 0 volts (i.e., grounded) when the CDP was connected through a conventionally designed XLR cable to a preamp having pin 1 grounded per the standard pin convention.
Best,
-- Al