Crown Audio I-T9000 HD User Manual

Optimized system gain structure maximizes signal to noise within the sys tem. 
Adjusting your amplifi er to fi t within an optimized system gain struc ture is 
accomplished by properly setting both the sensitivity and attenuation controls 
within the amplifi er. I-Tech amplifi ers offer 149 sensi tivity and gain settings 
allowing very fi ne adjustment of the amplifi er’s gain and voltage sensitivity. 
The Appendix section of the I-Tech Application guide (online at www.
crownaudio.com) provides charts with sensitivity in volts and gain in dB for 
each sensitivity/gain setting.

With other amplifi ers, it is often necessary to apply attenuation in order to 
achieve the desired sound pressure level. Large amounts of attenuation are not 
necessary with I-Tech amplifi ers and can, in fact, degrade performance. The 
attenuation adjustment should only be used for small (3 dB) or tempo rary 
adjustments in amplifi er gain. Instead, set the sensitivity/gain of your I-Tech 
amplifi er so that you can achieve the desired output with the attenu ators at or 
near 0 dB.

Example: Suppose that you are using an I-T9000HD with the sensitivity/gain 
set at 1.4V/37.1 dB. After optimizing the gain structure of the rest of your 
system you fi nd that attenuating the amplifi er by 10 dB produces the desired 
loudness. The same output level, with improved signal-to-noise ratio and 
headroom, can be achieved by using 0 dB of attenuation and by setting the 
amplifi er sensitivity/gain to 5.81V/27.0 dB (37 dB – 10 dB =  27 dB).

Note: as indicated in the online appendix, the list of possible sensitivity 
settings is different for each position of the max input setting. If, while 
adjusting sensitivity/gain in your amplifi er, you do not fi nd the setting you 
need, try changing the status of the max input setting and search again.