Which sub would you buy for the best sound quality? I am probably going for a 12" but may go 15", single, in a sealed box. The Brahma, Shiva, Perfect 12.1, Alpine type R, jlW3, IDmax12, ACI sv 12, ads 312rs, Alumapro Alchemy, Audiomobile Mass 2012 or something else? I am going to buy the JBL...