Systems Digital Audio Tranceiver/Mixer User's Manual

3-16 ZEPHYREXPRESS HARDWARE

ZephyrExpress XLR connectors are electronically balanced with pin 1 ground, pin 2 hot,

and pin 3 return. Line inputs are bridging, high-impedance.

Outputs are active-differential balanced, at a nominal +4dBu; an external resistive pad

may be necessary for consumer amplifiers.

All XLR Pinouts

PIN FUNCTION

1 Ground

2 Audio +

3 Audio -

· To use the line inputs with unbalanced sources, connect the signal to pin 2 and

ground to pins 1 & 3. You may need to raise the inputs’ sensitivity in the Audio menu.

· To feed the line outputs to an unbalanced device, connect pin 2 to the signal input and

pin 1 to ground. Do not connect pin 3.

CURIOSITY NOTE!

ZephyrExpress uses the “pin-2-hot” scheme shared by most modern equipment.

You can remember the pins with the mnemonic “George Washington Bridge”:

pin 1 = G = Ground; pin 2 = W = White = “+” in most cables; pin 3 = B = “-” =

Black.

Microphone Inputs

These are high-impedance inputs that’ll work with most modern microphones. Some

older transformer-coupled mics might show a high-frequency rise when unloaded; if

this is a problem bridge pins 2 and 3 with a 680W or 270W resistor, depending on the

mic’s nominal impedance.

Using Audio: microphone submenu choices, phantom power can be supplied at either or

both inputs, and nominal gain is separately adjustable to -60dBu (for ribbon

HOT TIP!

ZephyrExpress’ line outputs are at +4dBu, which may be too hot for the

unbalanced inputs on most consumer and semi-pro equipment. You’ll probably

need an attenuator, which can be as simple as a 5kΩ audio-taper potentiometer:

From Pin 2

From Pin 1

nal

Ground

ZephyrExpress Unbalanced Input5kΩ, audio