Has anybody tested what frequencies the rear deck signals are going to the factory 6x9's??? I am using the signal to feed my JL amp for the sub channels and finally got around to run some sine wave's at different frequencies thru it. I noticed the sub volume drops fast at about 65-70HZ and above. Almost like the rear deck signal is crossed over at the factory amp around 60-70HZ? I figured it was higher than this, maybe in the low 100's since the signal was for the factory 6x9's. I checked my amps crossover, its set at 80 and I even tried putting all the way to 100 to see if helped, no difference. Any one else ever check this or notice a drop off in bass in the 60-80HZ area in their subs??

 

I never measured it. SOmetime in the next few weeks we get an 05 in for Bluetooth, and I will check it then.