Operation Manual
I-Tech HD Series
Power Amplifiers
page 28
I-Tech HD Series
Power Amplifiers
Operation Manual
page 29
4.8.4 Input Signal Router
Each channel of the I-Tech’s signal processing has an Input Signal Router that
lets you choose the audio signal that will be used by the channel. Choose one
of the following configurations:
•
Analog Audio:
This is the audio input from the audio connector on the
back panel of the amp. Choices for the Analog Audio input are Channel 1,
Channel 2, or a sum of Channels 1 and 2.
•
Digital Audio:
This is the audio input from the AES/EBU connector or
CobraNet connector on the back panel of the amp. It can be set up for Digital
with Analog Backup or Digital with Analog Override:
•
Digital with Analog Backup
The input takes the digital signal as its source when the digital signal (or just
the digital clock) is present. If the digital lock is lost, the input switches to the
selected Analog Source. Once that digital lock is found again, the input
switches back to the selected digital source. This works even when the digital
signal has no audio but is sending a clock signal.
•
Digital with Analog Override
The input takes the digital signal as its source. If the analog signal level is
greater than an Analog Signal Detect Threshold that the user defines, the input
switches to the analog signal. As long as the analog signal level exceeds the
threshold, or as long as its level falls below threshold for a user-defined hold
time, the input remains the analog signal.
Analog Signal Detect Threshold (-100 dB to 0 dB)
This option is not displayed unless override is selected. If the selected analog
signal exceeds the threshold level, the analog signal becomes the source for
this input rather than the selected digital input source. Use the numeric spin
box or the fader provided to set the threshold.
Hold Time (0 - 60 seconds)
This option is not displayed unless override is selected. Once an overriding
analog input signal falls below threshold, the Hold Time determines how long
the input will continue to be the selected analog input before reverting to the
selected digital input. Use the numeric spin box or the fader provided to set this
time.
The control operation will vary based on the mode that is selected.
4.8.5 Source Configuration
In this screen you can configure the levels and settings of the
analog, AES and CobraNet inputs. The input signal of each channel
can be independently muted.
The I-Tech HD amplifier can be set to work as a fixed gain amplifier:
any input signal is given a fixed amount of gain, either 26dB or
32dB. In addition, you can set the input sensitivity to determine how
much gain is provided. See Section 4.8.20 for more details.
4.8.6 CobraNet Advanced Settings
In the CobraNet Advanced Settings screen you can set the
parameters shown here. Indicators that are green can’t be
modified.
The latency on this screen is the CorbaNet transport latency or
buffering. This latency must be set to the same latency as the
source CobraNet device.
The Foldback control panel lets you select the items to
transmit via CobraNet. Selections available are the Analog
Inputs, Amplifier Outputs or AES input signal. The audio can
be routed out through only one bundle.
4 Advanced Operation
4 Advanced Operation
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