I wanted to share my experience with the JL Audio Stealthbox upgrade on the Jeep Grand Cherokee with 506 Watt 9 speaker (Alpine inspired) sound system. As many have said the factory 8" sub in plastic enclosure leaves much to be desired. I decided to do the sub upgrade first as its the more expensive and invasive upgrade, then follow that with improvements on the door and satellite speakers following the direction of many members here.
My theory was that by adding a more powerful / higher quality sub, it would allow me to lower the bass level on the head unit EQ, resulting in a reduction of low frequency workload on the door speakers. With less stress on these speakers I hoped it would allow some improvement in overall mid and high level clarity and overall sound quality. Once I got the new sub installed and got everything tuned, I turned the bass level of the EQ down to 0 and in some cases as low as -2. The results were remarkable and proved my theory to be true. I'm certainly not advocating that adding a sub will make the factory speakers suddenly come to life, but it certainly improved their sound quality to the best they can be considering their inferior design and low cost construction. My other goal was to add a significant amount of powerful tight bass to the sound field without reduction of cargo space and keeping with the factory esthetics. The Steathbox by JL Audio delivered on all fronts.
JL Audio Stealthbox with 10W3 (500 Watt sub)
JL Audio XD600 Mono block Amp (600 Watt X 1 @ 2ohm)
LC2i Signal processor
JL Audio Sub level control knob
Dynamat sound isolation
Post Removal of factory sub and enclosure
Application of Dynamat
Stealthbox mounted and panel returned to original position
Amp and signal processor installed
Spare returned (note the passenger side tire storage bin removed)
Finished look of installation
A little later I will provide a photo of the bass control knob installed at the driver position. Please feel free to post any questions or feedback.
*My understanding is this steathbox is compatible with 2011-2015 GC
Overall the bass output of this single 10 rocks!!