I got my audio system installed. I'm using a Memphis 6-ch line out converter to JL 450/4 and JL 500/1. Subs are two 10w3 and speakers are Focal 6.5 K2P upgrade (fronts) and Focal 6x9 A1 (rear). The tweeters sounds muffle and the highs are not very clear. The 6x9 and 450/4 are fine and I checked by swapping the channels. The crossovers settings are set to "High", "Mid Flat", and Tweeter adjustment is at 0db. However, if I try changing the tweeter volume, nothing happens. Do you guys think my crossovers are bad?

EDIT: Problem fixed. Stupid installers were sloppy and feeding the line out with mid range only.