Sub recommendation to augment Klipsch La Scala's ???

I have Klipsch La Scala's Heritage Series and love them.  But am looking for a musical sub to augment them in the lower registers.  Must be musical, fast, and dynamic to keep up and give me the visceral kick drums I'm looking for.  I listen mostly to Jaz / Blues / Classic Rock. 

I'm thinking ported in Liew of sealed configurations.  I tried my Revel B15 sub pair and it was OK bot even with significant xover work didn't really integrate well with the speed and dynamics of the La Scala's.

Thanks in advance.

Mark