Telos ZephyrExpress Gain, Line Routing Switch, Routing, convert the mic inputs to line-level

Line Inputs

The two line inputs can be used for a single stereo or one or two mono signals.

Line A	Gain	Routing
XLR/TRS
		Stereo (A B) /
+		Mono (A+B) / off
Ð
Line B		To Channel A
		Codec, Monitors, SEND Meter
XLR/TRS +4 / -10 select
+		To Channel B
Ð		Codec, Monitors, SEND Meter

BOLD FACE: Front Panel Hardware

NORMAL FACE: Menu-item Software Switches

+4 / -10 select

Each input jack accommodates XLR or 1/4" phone plugs, wired balanced (pin 2 or tip hot) or unbalanced (signal on pin 2 or tip; ground to pins 1 and 3 or to ring and sleeve). Standard 2-conductor phone plugs can also be used for unbalanced signals: their sleeves will contact the jack’s sleeve and ring connections.

Input impedance is approximately 100k½, to bridge any line-level source. Transformer- coupled devices and equalized analog telephone lines can show a slight high frequency rise when they’re not terminated; if this is a problem, put a 680½ resistor in parallel with the input.

There is one menu adjustment for the line input, Audio: Line sensitivity. Set it to Profess for +4dBu sources, and Consumer for -10dBu sources. The line input can handle up to +19dBu in its Profess setting without clipping.

Line Routing Switch

The front-panel LINE 1&2 routing switch controls both line inputs simultaneously. It cycles between A B , A+B, and off.

•In A B mode, Line 1 is routed to the channel A send bus and Line 2 is routed to channel B: This is the normal mode for a stereo signal.

h• In A+B mode, the two line inputs are summed to mono and then routed to both busses. This lets you use two different mono line-level sources.HOT TIP!If you want to use two line inputs with separate gain controls or more flexible

routing, convert the mic inputs to line-level.

4-6 AUDIO OPERATIONS