Appendix 29
Amplifi er Application Guide
Q. I don’t want to use your DSP. Can I buy I-Tech without DSP?
A. No. The DSP is an integral part of the I-Tech, not just bolt-on signal processing. By integrating the DSP into
I-Tech, Crown engineers have been able to dramatically improve signal-to-noise, and use this integration to allow
intelligent control of amplifi er operation.
Benefi ts of integrated DSP:
• Greatly improved signal-to-noise, even when compared to amplifi ers without dsp.
• Gain staging is optimized and no longer a potential for operator error
• DSP has real-time knowledge of the amplifi er’s operation, which allows I-Tech to offer:
• Output voltage limiting
• Load monitoring
• Average output power limiting
Q. What kind of fi lters are available in I-Tech’s DSP?
A. There are 64 fi lters total within the I-Tech DSP and they can be placed anywhere within the system. In addition
to fi ltering,each possesses up to +/-24dB of gain.
The following fi lters 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 fi lters 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 fi lters.
Q. How many fi lters are available in I-Tech’s DSP?
A. There 64 fi lters available in I-Techs DSP.
Q. How much delay is available in I-Tech’s DSP?
A. I-Tech has over 2 full seconds of delay available on each channel, adjustable in 20 microsecond increments.
Q. What are the adjustment increments for I-Tech’s delay setting?
A. One 48,000th of a second, or 0.02083 millisecond, or approximately 1/4” or about 1 centimeter.
Q. Will other signal processors work with I-Tech? I don’t want to use the on board DSP.
A. Yes, any outboard signal processing can be used with I-Tech. You must remember that all DSP has its own
inherent latency and this must be considered when confi guring delays.
Note: As in all cases with any amplifi er, make sure you re-check the EQ for the room every time the system is
setup in a different location.
Q. Is post-processed audio available on the analog audio XLR outputs/loop through?
A. No. Since all I-Tech amplifi ers have DSP as standard, post-processed outputs are not necessary.
Q. What is an attenuator limiter?
A. An attenuator limiter is a control set via the front panel display or through IQwic software that places a limit or
lock on the attenuator at a user defi ned level keeping curious hands from turning the input attenuator beyond your
desired level.
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