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I run this to my K2's and they sound decent http://www.woofersetc.com/p4287/LRX-2250--Audison-2-Ch-420-Watt-Amplifier.htm had a PDX on them before...
A couple of sub suggestions: http://www.audioque.com/aq/?page_id=24...
Ported, tuned @33-35 hz, the L7's are ment for spl not really an sq sub. Will get loud though!
I guess it is all subjective based on what you have been exposed to, but if you were looking for a budget setup,something like this...