Telos ZephyrExpress user manual All XLR Pinouts, Microphone Inputs, Ground Audio +

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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

1Ground

2Audio +

3Audio -

∙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.

HOT TIP!

ZephyrExpressÕ line outputs are at +4dBu, which may be too hot for the unbalanced inputs on most consumer and semi-pro equipment. YouÕll probably need an attenuator, which can be as simple as a 5k½ audio-taper potentiometer:

ZephyrExpress	5k½, audio	Unbalanced Input
From Pin 2
		Signal
From Pin 1		Ground

CURIOSITY NOTE!

ZephyrExpress uses the Òpin-2-hotÓ scheme shared by most modern equipment. You can remember the pins with the mnemonic ÒGeorge Washington BridgeÓ: pin 1 = G = Ground; pin 2 = W = White = Ò+Ó in most cables; pin 3 = B = Ò-Ó = 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 680Ω or 270Ω 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

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