The TH-03 is an advanced digital hybrid that comes inversions for one or two telephone lines, and either analog or AES/EBU digital inputs and outputs. Each model has built-in signal level metering for each hybrid line. Feedback is automatically mitigated by the digital hybrid, and no adjustments or calibration are required. The two-line models include a mix-minus bus for multiplex communication while on-air or on-hold in the studio: Pressing the MPX button automatically establishes a conference between the two telephone lines, so only a single audio feed to and from the hybrid to the mixing console is needed. The TH-03 takes care of simultaneously getting both in-bound calls to the console, and provides audio from the console back to each individual telephone line, with both console audio and the other caller's audio. The TH-03 also has AEQ's built-in frequency extender. When activated, it moves all frequencies 250Hz upward on the send line and 250Hz downward on the receive line. This additional 2-1/2 octaves results in enhanced bass frequencies.
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