JBL 4641, for those with a means to properly manage and power it, realizes what most folks seek from a sub. The actual speaker (2241H), less the enclosure, is usually associated with custom home installations. With enclosure, this sub is marketed by JBL Professional for cinema installations. So, for this thread, let us consider just the speaker itself not to disqualify it LOL. BTW, at one time JBL did market this speaker with a beautifully sculptured walnut veneer ported enclosure as the B460. The idea was to extend the low end of the JBL L100 Century. I could not afford this sub, but I did get the baby version of it, the B380. As I understand it I got the last one. As I recall, I purchased it back in 1987 from a audio store in Pikeville, Ky.