Telos ZephyrExpress Line Inputs, Routing Stereo (A B) / Mono (A+B) / off, Gain, Line Routing Switch

4-6 AUDIO OPERATIONS
Line Inputs
The two line inputs can be used for a single stereo or one or two mono signals.
Routing
Stereo (A B) /
Mono (A+B) / off
To Channel A
Codec, Monitors, SEND Meter
To Channel B
Codec, Monitors, SEND Meter
BOLD FACE: Front Panel Hardware
NORMAL FACE: Menu-item Software Switches
Line A
XLR/TRS
+
–
+4 / -10 select
Gain
+
–
+4 / -10 select
Line B
XLR/TRS
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 100kΩ, 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 680Ω 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.
¥ 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.
hHOT TIP! If you want to use two line inputs with separate gain controls or more flexible
routing, convert the mic inputs to line-level.