opinions needed and wanted

[Simek4life 10+ year member]

Right now i have a 12" MTX7500 in the pre fab sledgehammer box. I have about 425 RMS watts to work with. and around $500. What are some subs that would be an upgrade to this?

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[smd4life 5,000+ posts]

i would upgrade to more power AND a bigger sub\box for that price

 

[Simek4life 10+ year member]

yeah i rele dont wanna get a 2nd amp.... right now i am bridging the back two channels off of the amp in the sig..... do u think it would be worth buying a new sub and building a box with only 425 watts to work with?