Telos ZephyrExpress user manual Line Inputs, Conductor Input plug, Monitor 1 XLR outputs

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microphones), -45dBu(most dynamic and condenser mics), or -30dBu(very hot condenser mics or dynamics in loud environments).

Either microphone input’s sensitivity can also be set to line, with a nominal level of +1dBu, for use as an additional line input. When line is selected, phantom power is not available.

IMPORTANT!

We donÕt recommend using unbalanced microphones.

Aside from the fact that their wiring is less immune to noise, using an unbalanced mic while phantom power is turned on can damage the mic, ZephyrExpress, or both.

Line Inputs

These jacks also accept standard 1/4" phone plugs, either balanced 3-conductor or unbalanced 2-conductor. Level is nominal -10dBuor +4 dBu, as selected in the Audio submenu. Peak input level is +19dBu.

The line input impedance is approximately 100kΩ, so it will bridge almost any source. Some transformer-coupled devices or equalized analog telephone lines may require a 680Ω resistor in parallel to prevent high-frequencies from being emphasized.

3-conductor

input plug

CONTACT	FUNCTION
Tip	Audio +
Ring	Audio -
Sleeve	Ground

2-conductor input plug

CONTACT	FUNCTION
Tip	Audio +
Sleeve	Ground

If using an unbalanced source with a 3-conductor plug, wire the ground to both the ring and the sleeve.

Monitor 1 XLR outputs

These carry the stereo signal from the Monitor 1 mixer, for use with monitor amps and public address systems. Their signal switching and volume is controlled from the front panel, and signal panning is controlled in the Audio menu.

Direct ISDN Receive outputs

These are the direct outputs of the audio decoder, with no level control or panning. Their primary use is to feed a cue-only circuit when both monitor mixers are being used for other purposes, or for when ZephyrExpress is being used as a remote receiver only.

If you want to hear the local microphones through these outputs, they have to be sent back from the distant studio (which will result in coding delays).

ZEPHYREXPRESS HARDWARE 3-17