I might have an issue with my system. It consists of an Alpine 9815 HU with JL XR650CSi components up front. I seem to be getting high treble and not enough mid-bass. I've tried to treak the EQ, but to no avail. Does anyone have any tips for getting more mid-bass? I swear I heard these speakers play better in the store. I have them powered by an amp (85W x 2). I turned the crossover on the amp to full and used 80Hz as the crossover from the fronts on the HU. Is that the right setup?

 

Cut the HU x-over off, and see if it sounds better. The HU x-over affects rca's as well as deck power.

 

Sounds like a phase problem to me.
make sure you don't have the mids out of phase. Maybe they were wired wrong from the factory. It happens sometimes.

 

What do you mean a phase problem? Can you elaborate? What steps can I take to find out if this is an issue or not. Should I take it to a professional?

 

I haven't had the chance to replace the factory head unit yet, but I changed the door speakers to Infinity kappa's 3way. There is definitely a drop in the mid-range. I'm still convinced it is the crappy head unit from Nissan, but I was reading in previous posts about others having issues with mid-range. I wonder if the Z has weird accoustics....

Tim