Finished installing the new speakers, amp, and chromecast to the AppRadio. Haven't set up my phone to work with it yet, but the radio is looking for a sync and sees the chromecast signal as valid, so high hopes.
Man, these new speakers are a lot better than the old Infinities! No distortion even at volumes that make the door panels move (which is way, way, WAY too loud).
Was in a bit of a panic as all I heard once I hooked it up was static. Playing around with the antenna connection lead me to the conclusion that the adapter was bad, it looks like the end had slid down on the wire and it no longer made a good connection. I was bummed out, as that meant I was going to need to buy another part... then I remembered the strange extra antenna adapter I received in my box from Sonic Electronix. Yep, it fit! Reception is great now! Disaster averted!
Sadly I couldn't finish hooking up my 12v to USB adapters (I'm replacing the cigarette lighter with a dual USB port and am hard-wiring my dash cam) as I ran out of solder. Will need to pick up more of that... and a new soldering gun, mine is shot.