Don't forget that speakers need to be "run in" before they sound their best. Cranking up the volume is not the best thing to do really. If your really unhappy with them take them back.
As for testing speakers, using just one type of music is not the best way to go about it. Use 3 or 4 different types of music. Make sure its varied, something heavy, vocal, piano, dance should give the speakers a good workout.
Oh and if it was me. I'd save up for some B&W's
