Hx1-Hx2 Manual-1.4.1 - Telos

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This arrangement is flexible, allowing the operator to place any or all sources in Utility for the
caller to hear. In our example we have the fortunate case that the console permits the Utility bus
to be fed pre-fader, letting the announcer easily use the telephone system for off-air conversations.
A recorder can be attached to the Utility and hybrid outputs to record announcer + phone
audio. This is often done as shown here, with each signal to a separate track. A drawback is the
potential for the operator to accidentally put the hybrid in Utility, in which case it is no longer a
mix-minus. To avoid this error, the signal path could be permanently disconnected by removing
the summing resistors, or some such creative operation.
If no bus is available to feed the Hx, you could use an external mixer that bridges the microphone
inputs to achieve the same effect.
The Hx2 has multiple hybrids and works best if two faders can be assigned to the telephone
system with two associated mix-minuses, one for each telephone line. This is probably not going
to be easy with an older console. But the Hx2 has an option to work with a single external mixminus
by making an internal cross-connection of the hybrids. See Section 2.3 for more on this.
Using a small mixer
Hybrid
PGM Bus
To Telco
Utility Bus
PGM Out
To Rec Ch.1
To Rec Ch.2
A small audio mixer is used to record interviews off the telephone line using a single hybrid.
The mixer’s main bus is fed to the recording device. Both the microphone and the hybrid will be
brought up on the faders so the interview can be recorded.
Most small mixers (such as those made by Mackie) have one or two Aux send busses, so we will
use these to feed the telephone system. We will turn up Aux for the microphone but we will
make sure it is turned fully off for the each channel that has the corresponding caller audio.