INSTALLATION | 11
♦ Analog clip point at +24 dBu
♦ Analog-to-Digital converter resolution of 24 bits
♦ Adjustable input level from -10 to +8 dBu
♦ Switchable LINE and MIC level input range
e unit can accommodate a line input level between -10 dbu and +8 dBu, adjustable with
a trim pot on the rear panel. e input level is set to +4 dBu level from the factory. A +4dBu
signal fed into the SEND IN connector should light the Yellow LED bargraph segment on the
Front Panel.
If more input gain is needed, turn the trimmer CLOCKWISE to increase the gain to match the
operating level of the hybrid.
Increasing the send level beyond a normal meter reading does not increase the level into the telco
line due to the hybrid’s AGC and limiting. You will only add distortion and degrade the hybrid’s
performance. ere is a dip switch conguration option that applies an extra 3dB gain after the AGC,
should you need more send level.
Next to the input level pot is a pushbutton switch that selects between line and mic levels.
When the pushbutton switch is in the LINE position (out), the input range of the SEND IN
signal is –10 to +8 dBu. When the switch is in the MIC position (in), the input range of the
SEND IN signal is –70 to –16 dBu.
e inputs are designed to be sourced from balanced lines. Usually shielded cables have the
shield wire connected only on one end (most often the input) to prevent ground loops. Older
equipment with a transformer output stage may need a terminating resistor across pins 2 and 3
to maintain a proper “at” frequency response; consult the manual for your equipment for how
to use it with high impedance inputs.
If you are connecting a device with an unbalanced output to your Hx, connect the shield from
the output of your device to pin 1 (ground) on the Hx input, and the “hot” lead from your
unbalanced output to pin 2 (high) on the Hx. Depending on the device, you might also want to
try connecting pin 3 of the Hx input to ground, or even “oating” the ground and using only the
high and low pins on the Hx. It’s also important that unbalanced lines be kept short to avoid
hum and noise pickup. You’ll probably need to adjust the input gain on the Hx to match the
output of your device. We also suggest that all of your audio equipment be powered from the
same AC power source or circuit to prevent ground loops due to the use of multiple grounds.
For complete information and suggested wiring and grounding techniques for your studio or
recording workstation, please visit the support page at the Telos website:
http://www.telos systems.com/support.
2.5 Output Audio Connection
e output connection, RCV OUT, has the following characteristics:
♦ XLR Pin 1 = Ground,
♦ XLR Pin 2 = High (Active Balanced, RF suppressed)
♦ XLR Pin 3 = Low (Active Balanced, RF suppressed)
♦ Output impedance, < 60 Ohms
♦ Analog clip point at +24 dBu
♦ Digital-to-Analog converter resolution of 24 bits
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