It will help voltage drop but if you are clipping heavily it will still overheat your sub. Turn the gain down, with 4V preouts you should probably not have to go more then 1/2 way up. Probably not even that far really. You need to download a test tone. You can even find them on Itunes. example......Search (Bass Mekanik, King of Bass) on Itunes and download the whole disc. It has test tones on it. Or find one somewhere else. Rough guideline for setting gain by ear. 1..Turn gain on amp all the way down. Bass boost on amp off completely 2.. Put a 50hz tone preferably (or loudest song you have in your playlist) and Turn volume up to the highest you will go to. (roughly 75-80%) Also go ahead and set the EQ the way you want for the bass portion on head unit. 3. start turning the gain up until you hear the bass change to a unwanted sound, back the gain back down until that goes away. If its a test tone it will be easier to hear the change from a clean signal to clipping unless you can turn your mids and highs completely off if playing a song. T