aluminum coils are good for a lighter moving assembly which helps sensitivity and some ppl say its not that good for sound quality but ive never heard an aluminum voice coil. i just installed an 18 in an explorer, its an re audio sx 18 d2 on a hifonics zues five channel amp, i clamped it and due to his lack of electrical its only running 700 watts(i clamped it at 690 something a month ago) but it flexes pretty good for only 700 watts. im more partial to an 18, more cone area, and it just looks baddass lol. a brz 1200 would run that bl nicely at one ohm or run a brz 1700 to have that extra power if you can check it with an oscope or dd-1