that i dont know bud.iv never had a chance to play with that model.
but in my bass settings i have some kind of defeat setting that can be turned on and off.seems to work smiler to a loudness button.

 

i'll have to check

 

I think I have measured that model before. I believe it only has 4v out of the sub output. The one I measured had just under 5v with the sub level at 15 and deck at 25, bass at flat and no mx or loudness on. You might have a fubard deck if you can't get more than 1v out of the sub output?

 

I am pretty sure that to get any power out of the deck on the sub output I had to turn the subwoofer up to the max...I never tried the other outputs but I know I have my bass cranked, treble cranked and sub cranked and that is the loudest

 

To add, I also have to turn the 'sub woofer' option to max. Then adjust the fader to rear to get my bass where I want it to with treble.

 

This is my deck BTW. If it helps.
Alpine Electronics of America, Inc. - CDE-9873