Hx1-Hx2 Manual-1.4.1 - Telos

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All perceptual codecs (such as the Telos Zephyr or X-Stream) or any IP codec, have too much
delay for talent at remote locations to hear themselves via a round-trip loop. Therefore, another
mix-minus is required to feed a codec.
The talent hears callers via the codec return path. As before, you feed this return with mixminus:
a mix of everything on the program bus minus the remote audio. As for the second half
of the equation, the callers hear the talent because the remote feed is added to the telephone
mix-minus bus. This is no problem if you have a set-up that permits selective assignment to the
hybrid mix-minus.
A problem with this arrangement is a result of a hybrid with too much leakage combined
with the system delay. If the hybrid isn’t doing a good job of preventing the send audio from
leaking to its output, the special remote send mix-minus is corrupted. Remember, if any of the
announcer audio from the remote site is returned via the monitor feed, it will be delayed by the
digital link, causing an echo effect. The Telos Hx really shows its stuff in this situation. Because
it has such good trans-hybrid loss, leakage is not at all likely to be a problem. And should there
ever be a problem, you can solve it by increasing the amount of ducking. See Section 4.2.
Note
The Telos Hx has the more common pin-outs used for three pin XLR inputs & outputs. You
can easily remember the correct signals when wiring connectors using the phrase “George
Washington Bridge.” Pin 1 = G = Ground, Pin 2 = W = “+” = White (typical color in mic cable, if
there is no white there will be a red conductor), and Pin 3 = B = “-” = Black.