yeah i jus talked to car place an found that out... an i guess the box was built custom by a local company g force an was built to spec for a l7 15 ported... as for another amp naw... i am gunna sell this sub in like 3 months an buy 2 fosgate t1's an run em mono for 1000w.. but its all brand new an i didn't have the money for the nasty amp, an i got the sub an box for 400 brand new so it was a deal in comparison to buying new for 450(sub) an 150-250 for the box... its louder than my 2 p1's an my 10 in kicker freeair in a bandpass sooooo..... like it ****in pounds i jus wanna get the most out of it before i sell it.....