I have the Alpine system, and I did an amp install for better bass over the last few days, and am temporarily using my old subwoofer box out of my 2011 ram. It 3/4 fits under the seats until I decide what I want to do for a new one... It sounds great. I used an Audiocontrol LC1.800 amplifier, and cut the plug off of the factory sub and wired the two outer channel voice coil wires directly into the amplifier speaker level l/r inputs, and left the middle voice coil channel unused., as it says that it can accept a 3-40 volt rms input. The unit also turn itself on and off, although it gives the odd turn on/off thump. In doing my install there are a few things I noticed.....
1. Any aftermarket sub is probably going to cause issues with the Active Noise Cancellation. I was getting whoop whoop whoop noise and rpm fluctuations through the subs, which I think can also be attributed to them firing upward, instead of from behind the seat, which makes them out of phase from the factory sub. This led me to unpin the positive wires from the 4 microphones at the factory amp connector, effectively disabling the system.
2. Thus far the factory amp has not complained about no load resistor on the subwoofer wires, or shut down the output, and seems to play just fine into the aftermarket amplifier's Hi Level inputs. Although it has only been 3 Days.
3. I replaced all 3 of my Dash Speakers with JBL GX302's, and never had factory wire adapters, as they are lost in the mail somewhere, so I desoldered the plugs off of the factory speakers, trimmed them a bit and mounted them onto the gx302's making sure the polarity was correct. See pics below...
4. Yesterday my JBL gx692 6x9's showed up that came with the Metra adapters. I pulled the factory speakers from the rear doors, and replaced the 6x9's. they did not sound right. Upon inspection and testing, I found that the Metra adapters are wired backwards with the positive and negatives reversed. I swapped the pins on the metra cables to make them correct, and re-installed the rear speakers. They sound great. I still have to do the front doors, although I don't know if the aftermarket speakers will make much difference there, as they are not full range, and I also have a set of tweeters that I may install in the top headliner.
Overall the system sounds 100 percent better. Now if only RAM can get their asses in gear and fix the plethora of intermittent issues with this 8.4 uconnect.
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