So I haven't seen many builds that put a stereo system into an Equinox, but I did get some good advice here on information removing door panels, and on electronics, so I wanted to give some info back to the community.
The install is on a Granite Black 2012 LTZ, 3.0 (upgraded alternator)
The intent is to keep the system as low profile as possible, retaining as much room and stock function as possible. The interior was removed for sound deadening additions, and replaced to retain stock look.
With this in mind, the factory headunit was retained, and speaker level outs were used to provide sound to the processor, which then fed the amps at an RCA level out.
The equipment was mostly recovered from my 1997 Tahoe, only the capacitor, Punch Pro tweeters and midranges are new:
Rockford Fosgate 360.2 sound processor (this takes the speaker levels and turns them to RCA levels and provides a remote turn on switch for the amps, plus having significant time delay and level setting capability for each channel)
Rockford Fosgate 1501BD monoblock amp
Rockford Fosgate 851x 4 channel amp
Rockford Fosgate T600.2 2 channel amp
Eclipse SW9152 15" subwoofer
2 Rockford Fosgate Punch Pro 5" tweeters
2 Rockford Fosgate Punch Pro 6.6 midrange
2 Rockford Fosgate Punch Pro 8" midranges
Rockford Fosgate 40 Farad Capacitor
The overall build has the tweeters built into the kick panels near the feet of the driver and passenger, this required some modification. These will be amplified by 2 channels of the 851x, crossed highpass at 4k. The 6.5's replace the stock speakers in the front door, they are baffled to protect from moisture, and the door sound deadened, powered by the 3rd and 4th channels of the 851x, crossed 4kHz, and 400hz. The 8" midranges are in the stock rear door speakers after resizing the holes, replacing the 6" wizzer coned stock speaker, with significant door sound deadening, powered by the T600.2, crossed at 400hz and 70hz. The sub handles 70hz and below.
The subwoofer is being built into a fiberglass box that sits in the spare tire well, centered. The tire mount bracket was drilled at the spot rivets and then folded down to the floor. The sub will fire up at the ceiling and the sub amp and 4 channel amp and sub amp (matching silver) will go in a row behind the seat. The capacitor is mounted to the right of the sub along the rear wheel cover where the original sub was. The sound processor and T600 amp are mounted in the stock sub area. A false floor will cover the subs and amps, raising the level of the back deck about 4-5 inches, losing a little room for transport, but still allowing bikes to be thrown in the back, dogs to walk on it, and the transport of a spare tire if needed (I just use AAA).
A few notes, the stock sub area has a lot of room. The driver side contains electronics and pumps for the rear washer, which prevented any installation on that side. On the stock sub side, we were suprised to find the wheel sat out closer to the center of the car than the driver side well. This is due to an extra metal plate that covers over the gas intake , which makes the sub area quite deep. We had to fabricate a mounting bracket using the sub connections as a template, but we were able to fit an amp and processor in the area, as well as significant wiring.
The tweeters are massive, and have 3" mounting depth. Even after building two 3/4 inch MDF rings to lift them off the kick panels, there was still not enough room on the passenger side to accomodate the depth. The stock panel has a clip right in the center where the speaker hole is being cut, where it mounts on to a raised metal panel. That panel is being beaten into submission to get about a half inch of depth necessary to fit the tweeter's magnet.
The install should be done today or tomorrow,and I should have some pics of the build, though it won't seem to let me post. Lighting is still coming, but some of the finishing details require some planning, and that will be added after the sound is complete.
Edit: Trying for pics: