Telos ZephyrExpress - Manual (Page 57)

3-16 Z EPHYR E XPRESS 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.
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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 680
W 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
h
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
Signal
Ground
ZephyrExpress Unbalanced Input 5kΩ, audio