+++ If you really don't want to spend time and $$ to set things up, then check if the passive has a tweeter attenuation switch. Else see if you can turn down the mids and highs from your hu. That will give you better balance for now. A couple of weeks down the road, you may find yourself turning up the mids/highs a touch. That said the tweets on the db series are a little bright. But nothing that can't be tamed.
If you're willing to spend some time and $$, I would go with an 8" sub in a small .3-.4 sealed box and a 4 ch amp over a powered bass tube. You'd find the lower end much cleaner with a sub. Plus you'd get more out of your speakers.