appreciate the inputFyi... I scoped the factory Bose HU and at max volume I had 3.5V and zero distortion.
I also was able to use the pre amp signal wires straight into the Helix. I just spliced RCA's onto the front right/left pre amp wires in the trunk. So if you ever wanted to ditch the JL Fix you can.
My car is a 2013 G37S sedan w/ Bose NAV and 10 speakers. A pillar tweets, center channel, 4" mids and 10" midbass in the doors, two rear door speakers and a 10" sub in the rear deck. I'm pretty confident it is the same exact system in the Q's.
Just passing info along if you want to let your tuner know....