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Operation Manual
I-Tech HD Series Power Amplifi ers
page 18
Input Sources: For each channel, turn the Encoder to select ana log, digital,
or automatic backup source. Options are:
Analog
Digital
Digital with analog backup <Digital A-Backup>
Digital with analog override <Digital A-Ovride>
Digital with analog backup: The I-Tech HD is being fed a digital signal and an
analog signal. The input is currently switched to the digital signal. If it fails, the
I-Tech HD switches instantly to the analog signal.
Digital with analog override: The input is switched to the digital sig nal, and no
analog signal is applied. If an analog signal is sent, the I-Tech HD switches
instantly to the analog signal. If the analog signal fails, the I-Tech HD switches
to the digital signal after a delay set by the Hold Time slider in the Input Section
of the System Architect page.
Maximum Analog Input: Turn an Encoder to select the maximum input level
to the amplifi er: +21 dBu or +15 dBu. Press the knob to confi rm your selection.
Note: Changing this value changes the range of sensitivities available to the
amplifi er.
For more information see Figure 4.4 and the I-Tech Sensitivity Charts in the
Appendix of the I-Tech Application Guide. It is available online at www.
crownaudio.com/itech/pdf/137327.pdf.
4 Advanced Operation
Attenuator Limits: You can set the maximum attenuation from 0 dB to
–100 dB. This feature allows you to set a limit on the attenua tors. Once set,
attenuation cannot be adjusted beyond this level. The attenuator limit appears
as a line in the attenuator bar meter.
NOTE: The attenuator setting must be below the attenuator limit that you are
trying to set. For example, if the attenuator is set at –3 dB, you cannot set the
attenuator limit below –3 dB unless you decrease the attenuator level.
0.0
Attenuator Limits
Attenuator Limits
dB
dB
0.0
Attenuator Link You can set the attenudators to be independent or linked.
Turn an Encoder knob to choose one of those options, then press the knob to
save your choice.
INDEPENDENT
Attenuator Link
Attenuator Link
Turn to Set-Press to Save
Turn to Set-Press to Save
<Analog> <Digital>
Input Sources
Input Sources
Analog Source Select: Turn the left Encoder knob to select Analog 1,
Analog 2, or Analog 1+2 signals for Channel 1. The right Encoder does the
same for Channel 2. Press the knob to confi rm your selection.
Analog 1 is Analog input Channel 1.
Anolog 2 is Analog input Channel 2.
Analog 1 +2 is Analog input Channels 1 and 2.
Analog Analog
Analog Source Select
Analog Source Select
1 2
+15dBu
Maximum Analog Input
Maximum Analog Input
Turn to Set-Press to Save
Turn to Set-Press to Save
Digital Source Select: Turn the left Encoder knob to select the digital source
for Channel 1: AES or Cobranet. The right Encoder does the same for Channel
2. Press the knob to confi rm your choice.
Digital Source Select
Digital Source Select
AES
<Cobra
net>
AES Source Select: Turn the left Encoder knob to select the digital source for
Channel 1: AES1, AES2, or AES1+2. The right Encoder does the same for
Channel 2. Press the knob to confi rm your choice.
AES 1 is AES input Channel 1.
AES 2 is AES input Channel 2.
AES 1 +2 is AES input Channels 1 and 2.
AES
AES Source Select
AES Source Select
AES
1
2
AES Input Trim: Turn the left Encoder knob to vary the gain of the AES digital
signal for Channel 1: -100.0 dB to +20 dB. The right Encoder does the same for
Channel 2. See Figure 4.4 for more information.
0.0
AES Input Trim
AES Input Trim
0.0
dB
AES Input Status: “Lock” indicates that an AES cable is plugged in and the
amplifi er is receiving (and locking to) the AES clock pulse. “No Lock” means
that the amplifi er is not receiving, or is not locking to the AES clock pulse.
No Lock
AES Input Status
AES Input Status
CobraNet Source Select: Turn the left Encoder knob to select the CobraNet
source for Channel 1: Cnet1, Cnet2, or Cnet 1+2. The right Encoder does the
same for Channel 2. Press the knob to confi rm your choice.
Cnet1 is Bundle A.
Cnet2 is Bundle B.
Cnet 1+2 is Bundles A+B.
Cnet 1
Cobranet Source Select
Cobranet Source Select
Cnet 2
CobraNet Input Trim: Turn the left Encoder knob to vary the gain of the
CobraNet digital signal for Channel 1: -100.0 dB to +20 dB. The right Encoder
does the same for Channel 2. See Figure 4.4 for more information.
0.0
Cobranet Input Trim
Cobranet Input Trim
0.0
dB