Crown Audio I-T9000 HD Advanced Operation, I-TechHD Series Power Amplifiers, page, Average

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 fi lter, 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 subwoofers, midrange drivers and high-frequency drivers.

Bandpass Gain

0.0dB 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.

Input Delay

0.0000 ms 0.0000

0.0/0.0 ft/m 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.

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 ms 0.0000

0.0/0.0 ft/m 0.0/0.0

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 confi rm your selection.

LED Meter Display Type

AVERAGE

Turn to Set-Press to Save

Bar Meter Display Type: You can select what the bar meters will display in 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 Attenuation 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 controls, such as attack and release, are available through System Architect.

Peak Voltage Limiter

OFF v OFF

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.

RMS Voltage Limiter

OFF v OFF

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 dB OFF

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.

Operation Manual page 19