...are they designed for them? I have two DB104's in a vented box being pushed by a 200w x 2 Kicker amp...and they sound kinda distorted. Overall they sound well, but whenever they play a kick drum they produce a "thud" sound instead of the traditional "boom." Bass notes sound well, just the kick drums sound crappy. At first I was thinking they might needed to be broken in, but it's been almost 3 weeks with them being played every day at least a hour...so I don't know. Are they really made for sealed enclosures, or am I not running a strong enough sub/amp for the vented box? Thanks in advance!