I-Tech Series
Power Amplifiers
Operation Manual
page 31
control. When the memory backup is disabled, the amplifier stops storing
changes made to its settings. When the next power-up occurs the amplifier
uses the settings that were active when the backup feature was disabled.
CAUTION:
Care should be taken to backup “safe” levels for the input
attenuator controls. It is possible for the memory backup feature to be dis-
abled with “unsafe” levels stored. This may result in significantly greater
system gain the next time power is reapplied to the amplifier.
4.6.21 Input Signal Router
Each channel of the I-Tech’s signal processing has an Input Signal Router
that allows the choice of audio signal that will be used by the channel. The
user may 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 on
the back panel of the amp.
4.6.22 Filters
Each audio channel has five separate places where filters can be placed in
the system. Up to 64 filters can be placed anywhere within the system. In
addition to filtering, each possesses up to +/-24dB of gain. The following
filters are available:
•
Lowpass: Bessel 2-4, Butterworth1-4, and Linkwitz-Riley 4
•
Highpass: Bessel 2-4, Butterworth1-4, and Linkwitz-Riley 4
•
Lowshelf: Low-frequency shelving EQ
•
Highshelf: High-frequency shelving EQ
•
Lowpass EQ: Variable Q from 0.1 to 35
•
Highpass EQ: Variable Q from 0.1 to 35
•
Parametric EQ: Variable Q from 0.1 to 35
•
All Pass: 1st and 2nd order
All Pass filters provide no gain change to the output, but provide a phase
change at the selected frequency. This corrects the phase relationship of
the output without a gain reduction, such as is found in other filters.
4.6.23 Delay (Latency)
Due to the nature of DSP processing, there is some inherent delay or
latency within the I-Tech’s DSP. These delays are:
• 1.13mS analog
• 2.36mS digital (44.1 kHz)
4.6.24 Noise Generator
Each channel has an independent uncorrected noise generator that allows
noise to be mixed into the audio signal. This is useful for noise masking
applications and testing. Each channel has the following controls:
•
Noise On/Off:
The channel’s noise generator can be independently
turned on.
•
Noise Type:
Full spectrum white noise or pink noise.
•
Noise Level:
A fader to allow the noise level to be controlled.
4.6.25 Sine-wave Generator
A sine-wave signal generator allows the mixing of a single tone into the
audio signal. Typical applications can be for the injection of a high fre-
quency tone (19kHz) into the signal in paging type system to continually
drive the speaker, allowing continuous monitoring of the speaker load. The
following controls exist:
•
Sine On/Off:
The sine-wave signal generator’s function.
•
Sine Frequency:
Controllable from 20Hz to 20kHz.
•
Sine Level:
Each channel’s sine-wave signal level can be indepen-
dently controlled.
4 Advanced Operation
Summary of Contents for I-Tech I-T4000
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