Who are some of elite sub woofers?

When I was shopping around for subs for a 2 channel system I narrowed it down to JL and REL.

I went with the REL as I found them to be more naturally revealing and yes they do enhance the entire musical spectrum. 

I like that REL is able to seamlessly integrate their sub bass systems   into existing speaker systems with their Swiss-made Neutrik SpeakOn connectors.

There are other cable companies that offer the cables if you are looking for an upgrade as well.