Precision Power E.DZ User Manual

The CD Gain Selector will increase or decrease the input sensitivity of the CD input. We

 

suggest if your source unit's pre-amp voltage is 4V or greater, set

 the sensitivity switch to 

HI.  If your source unit's pre-amp voltage is 2V-4V,

 set the sensitivity switch to MID. If your 

source unit's pre-amp voltage is less than 2V,

 set the sensitivity switch to LOW.

The Subwoofer Frequency Selector is a built-in low-pass filter for the Subwoofer Output. 
Generally, the low-pass filter can be set to 128Hz, then the subwoofer amplifier's low-pass 
filter is fine tuned for the desired response.