JL Fix82 - Lexus IS (3rd gen) - Car Audio | DiyMobileAudio.com | Car Stereo Forum

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Old 03-26-2016   #1
 
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Default JL Fix82 - Lexus IS (3rd gen)

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:
FRONT DOORS:


FRONT DASH:


SUBWOOFER:


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.
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Old 03-26-2016   #2
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Default Re: JL Fix82 - Lexus IS (3rd gen)

That bumps probably the car
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Old 03-26-2016   #3
 
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Default Re: JL Fix82 - Lexus IS (3rd gen)

Quote:
Originally Posted by DDfusion View Post
That bumps probably the car
This is measured from the line out of the Fix82, not speakers. Car acoustics aren't playing a factor in that measurement.
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Old 03-27-2016   #4
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Default Re: JL Fix82 - Lexus IS (3rd gen)

This is some really great information, I'm currently considering getting a 3rd gen IS350 in the future and was debating on the best manner of factory integration.

I may attempt to open up a factory amp and having a poke around to see if there is any chance of hijacking the signal at some point after volume control (and possibly dobly prologic) is applied, but before amplification/eq is done. I'm guessing not, but engineers aren't having fun unless they are attempting to find potentially more optimal solutions to already solved problems.
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