Do you have the premium system? If yes you can't remove the amp due to the Can Bus. Pretty sure you would need a NavTV Zen A2B interface and plug it into the factory radio. There are many options and compact sub amps like the Audio Control ACM1.300, it gives you 300 watts rms @ 2ohms and oy measures 9-1/2"W x 1-13/16"H x 3-9/16"D, problem with the existing location is you may not have enough air space the subwoofer would require. Look into a shallow mounted sub like the JL Audio 10TW series, they only need .5 a cubic foot of airspace to sound good. Good luck!!!
Hi guys,
I'm at a desperate point right now, haven't been able to install the zen unit and any local shop has experience. From reading your comments, I can see you have experience using it.
1. I have it connected and working(can lo to white/green, can hi to blue/green.
2. My SYNC 3 doesn't detect any audio if I don't connect back the factory can Hi and Lo to the amp. Doesn't even let me choose the audio menu.
3. Haven't been able to get any signal from the zen unit.
4. Can I have both factory amp and zen unit connected?
I'm on a explorer 2021 ST with B&O, with zen unit updated yesterday.