If you're looking to keep your sub in good condition, leave "Bass" on the headunit at 0 and turn down bass boost on the amp to 0. Also, set your gains with an oscilloscope (or at least a digital multimeter)
If it's not loud enough for you when set properly, then you've caught the disease and will have to upgrade equipment. Don't worry, it happens to all of us
lol aw man i guess i need to get a couple of 12w7s then lol this setup i love for listening to everyday on music but when i want to blast it it aint as loud as i want but i reckon i just need to go ahead and buy another sub and amp and be done with it lol
how much did you spend on that 12w7?
200, got it from a guy who needed the money, like new, i got lucky on that deal