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go to Fi technical and click on BL enclosure recommendations it will explain

i need to keep it under $900 here are a few of my options well here are sum of the amps i have in mind MTX Thunder Elite TE1501D Kicker 04SX1250.1 Rockford Fosgate T1500-1bd Autotek MM 2000.1D, Autotek MM 3000.1D, Autotek MM 4000.1D JL Audio 1000/1 Kicker 06ZX2500.1

im looking to purchase either 2 BL 18's or 2 MTX T9515-44 15's im not sure what amp to get, iwas thinkin on going with autotek but ive heard people say they aint very stable, if not one of those, what would be a good amp to run those subs?

im gettin just 1 dual 2 ohm 18" BL sub (im on a budget) then try to find somebody to build me a box, and what ever amp i can find for bout $500 to $600 that will push it. any suggestions?

so lets say i had an amp that runs down to 1 ohm and i only get one 18" sub,, iwould have to get a dual 2 ohm right? to drop to 1 ohm? and i would have to have two dual 1 ohms to run at 1 ohm? and does the universal option hurt the sub any, performance wise? sorry im just startin to learn.

im ordering a 18" bl series sub with coling, flatwind, and for daily. what would be the pros and cons of gettin a 1 ohm or 2 ohm or universal sub?