New Subwoofer

If you read the manual the gain isn't the setting where you select 0db, 3db, 6db, etc.. I KNOW there is a seperate setting that lets you adjust it better. I have read the manual for other people that havn't or couldn't find it because Alpine didn't really indicate how to adjust the gain in it. 

Adjusting the input level:

1. Press the mode button until input is displayed

2. Press enter

3. Press the left or right button until input level is displayed

4.Press enter

5. Use the left and right mode buttons to adjust the level (.1-2V/.5-8V)

One last thing, making your amp clip and blowing a sub or speaker by doing so is overpowering it. It's not just because of the clipped signal it's because of the higher power the amp is putting out when clipping severely. I can't explain it that well but Stephen Kephart and others on here have had some good posts about it. Do a search.