i am running an svt4pro head w/svt410hlf cab. i'd like a little more low end and was thinking of the hartke vx215 cab. the ohms and wattage are perfect but i can't find anything about db's. 1. does any one have any input on the vx215? 2. should i even worry about the db's? 3. any crossover frequency suggestions? i would appreciate the help.