Since the Fix 82 is so closely tied with OEM integration, this review is going to contain a lot of car specific data (hence the title).
I recently picked up a Lexus IS and started taking it apart. I haven't had a new car for a while, so channel summing/eq'ing was all new to me. I decided not to try and grab the signal before the amp, as I would then lose my ability to control the volume from the steering wheel/stock deck. I was then left with doing a high-low conversion.
One thing that I've learned from past installs is to not skimp on gear. The time wasted troubleshooting stuff is well worth paying a bit extra cash for reliable gear. JL has saved my butt several times with their amps, so I was delighted to see an update to their high/low converters with the Fix82.
Here are the measurements of my stock speakers taken directly from the stock amplifier using a Minidsp C6x8 as a high-low converter. Green measurement is reference amplifier:
I decided that these were good enough to pass to the Fix82, and left the rears alone. I figured that I would just run the system faded to the front, and in the rare occasion that I had backseat passengers, I could fade to the rear and use the stock system.
Here is the results from the Fix82 after calibration.
Seems like it did a pretty good job. Only complaint is a small +5db bump at 2kz. I may try and recalibrate as I move along to see if I can get better results. It failed several times at calibrating before I realized it was due to a ground loop (I was using an external PSU for testing purposes/ended up simply running temporary wiring directly to battery). I was hoping to use the "signal sense" turn-on feature of the unit, but that totally didn't work
Consider this an ongoing review as I move forward with my install. Please let me know if you have any questions, as I haven't seen any reviews of this unit yet.