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4 Advanced Operation
Attenuator Limits: You can set the maximum attenuation from 0 dB to
Analog Source Select: Turn the left Encoder knob to select Analog 1,
–100 dB. This feature allows you to set a limit on the attenua tors. Once set,
Analog 2, or Analog 1+2 signals for Channel 1. The right Encoder does the
attenuation cannot be adjusted beyond this level. The attenuator limit appears
same for Channel 2. Press the knob to confirm your selection.
as a line in the attenuator bar meter.
Analog 1 is Analog input Channel 1.
Anolog 2 is Analog input Channel 2.
NOTE: The attenuator setting must be below the attenuator limit that you are
Analog 1 +2 is Analog input Channels 1 and 2.
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.
Attenuator Limits
0.0
0.0
dB
Maximum Analog Input: Turn an Encoder to select the maximum input level
to the amplifier: +21 dBu or +15 dBu. Press the knob to confirm your selection.
Attenuator Link You can set the attenudators to be independent or linked.
Note: Changing this value changes the range of sensitivities available to the
Turn an Encoder knob to choose one of those options, then press the knob to
amplifier.
save your choice.
For more information see Figure 4.4 and the I-Tech Sensitivity Charts in the
Attenuator Link
Appendix of the I-Tech Application Guide. It is available online at www.
INDEPENDENT
crownaudio.com/itech/pdf/137327.pdf.
Turn to Set-Press to Save
Input Sources: For each channel, turn the Encoder to select ana log, digital,
or automatic backup source. Options are:
Analog
Digital
Digital Source Select: Turn the left Encoder knob to select the digital source
Digital with analog backup <Digital A-Backup>
for Channel 1: AES or Cobranet. The right Encoder does the same for Channel
Digital with analog override <Digital A-Ovride>
2. Press the knob to confirm your choice.
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
AES Source Select: Turn the left Encoder knob to select the digital source for
to the digital signal after a delay set by the Hold Time slider in the Input Section
Channel 1: AES1, AES2, or AES1+2. The right Encoder does the same for
of the System Architect page.
Channel 2. Press the knob to confirm your choice.
AES 1 is AES input Channel 1.
Input Sources
AES 2 is AES input Channel 2.
<Analog>
<Digital>
AES 1 +2 is AES input Channels 1 and 2.
page 18
I-Tech HD Series Power Amplifiers
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.
AES Input Trim
0.0
dB
Analog Source Select
Analog
Analog
1
2
AES Input Status: "Lock" indicates that an AES cable is plugged in and the
amplifier is receiving (and locking to) the AES clock pulse. "No Lock" means
that the amplifier is not receiving, or is not locking to the AES clock pulse.
AES Input Status
No Lock
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
Maximum Analog Input
same for Channel 2. Press the knob to confirm your choice.
+ 15 dBu
Cnet1 is Bundle A.
Cnet2 is Bundle B.
Turn to Set-Press to Save
Cnet 1+2 is Bundles A+B.
Cobranet Source Select
Cnet 1
Digital Source Select
<Cobra
CobraNet Input Trim: Turn the left Encoder knob to vary the gain of the
AES
net>
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.
Cobranet Input Trim
0.0
AES Source Select
AES
AES
1
2
I-Tech HD Series Power Amplifiers
4 Advanced Operation
Bandpass gain: In each channel of the I-Tech HD's DSP, just before the
output limiter and after the preceding filter, is a gain block (not shown on the
Signal Path block diagram). Bandpass Gain adjusts the gain of this block
between -24 dB and +24 dB.
Adjusting the bandpass gain in the LCD screen makes it easy to vary the level of
0.0
subwoofers, midrange drivers and high-frequency driv ers.
Bandpass Gain
0.0
Output Polarity: Press each channel's Encoder knob to toggle the output
signal polarity between + and –.
Output Polarity
+
Press enc to toggle
Input Delay: Sets the input signal delay in each channel. Turn each channel's
Encoder knob to vary the delay. The delay step size is speed sensitive. Pressing
the encoder enables or disables the Delay.
Below each channel's delay setting is the equivalent distance in feet and meters.
For example, 10 ms is the signal delay of sound traveling 11.3 feet or 3.4 m.
Cnet 2
Input Delay
0.0000
0.0/0.0
Output Delay: Sets the output signal delay in each channel. Turn each
channel's Encoder knob to vary the delay. The delay step size is speed sensitive.
Pressing the encoder enables or disables the Delay.
0.0
dB
Below each channel's delay setting is the equivalent distance in feet and meters.
For example, 10 ms is the signal delay of sound traveling 11.3 feet or 3.4 m.
Speaker Delay
0.0000
0.0/0.0
Operation Manual
Operation Manual
LED Meter Display Type : Here you can set the LCD bar meters to display
average or peak levels. Turn an Encoder knob to select the option, then press
the knob to confirm your selection.
LED Meter Display Type
AVERAGE
Turn to Set-Press to Save
0.0
Bar Meter Display Type: You can select what the bar meters will display in
dB
the Attenuator Screen. Press an Encoder knob to select Attenuation, Input
Levels, Output Levels, or Thermal %. Attenuation is displayed as the length of
the bar meters in the Atten uation screen that appears on startup. The meters
display average input levels and output levels.
Bar Meter Display Type
ATTENUTATION
Turn to Set-Press to Save
+
LevelMax - Clip Limiter: Limits the peak output voltage to just below
clipping for each channel. Press an Encoder knob to turn it OFF or ON.
Clip Limiter
OFF
OFF
LevelMax- Peak Voltage Limiter: Limits the peak output voltage to a level
that you set, either OFF or 1 to 500 volts, for each channel. Press an Encoder to
turn on the Limiter. Once it's on, turn the Encoder to set the voltage. Additional
0.0000
ms
controls, such as attack and release, are available through System Architect.
ft/m
0.0/0.0
Peak Voltage Limiter
OFF
OFF
v
LevelMax - RMS Voltage Limiter: Limits the output rms voltage to an
amount that you set, either OFF or 1 to 500 volts, for each channel. Press the
Encoder to turn on the Limiter. Once it's on, turn the Encoder to set the voltage.
Additional controls, such as attack, and release, are available through Sys tem
Architect.
0.0000
RMS Voltage Limiter
ms
0.0/0.0
OFF
OFF
ft/m
v
Pink Noise generator: Press an Encoder knob to turn on the generator. Its
level will read –100 dB. Adjust the noise level from –100 dB to +20 dB in 0.5 dB
steps by turning Encoder 1 or 2. To turn off the generator, press an Encoder knob
or go to another menu item.
Pink Noise Generator
OFF
OFF
dB
Front Panel Blackout: This screen lets you black out the front panel display
unless you press a front-panel button or turn an Encoder. This feature turns
off the LCD backlight and all front panel LEDs except for the fault LEDs and
power-switch green LED. After blackout is enabled, an Encoder press/turn
will "reactivate" the display. If no button is pressed/turned for 5 seconds, the
display will return to blackout mode.
Front Panel Blackout
OFF
Exit: To exit the Advanced Menu and go to the Attenuation screen, press Menu/
Exit once.
page 19
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