A keen eye will notice that, along with the gray carpet and interior, that I also replaced the stereo head unit.
I got a Pioneer DEH-80PRS. It's sort of their entry level audiophile unit. 16 band stereo EQ, Burr-Brown D/A converters, automatic speaker time alignment, automatic EQ settings. It has bluetooth audio and phone capability (I still need to plug in the mic). It can also be set up as a low/mid/high "network" setup, which I didn't do.
But why I really bought it was for the Automatic Sound Levelizer capability. It can automatically increase the volume to compensate for road noise, which is invaluable in this truck. Constantly changing the volume was driving me nuts. It looks great, and sounds great. Very happy with it.
DEH-80PRS - CD Receiver with 3-Way Active Crossover Network, Auto EQ, and Auto Time Alignment | Pioneer Electronics USA
I backed it up with one of Pioneer's slimline GM-D1004 amplifiers. It's exactly as wide as the head unit, and outputs 45w RMS per channel. 4 channels. I did the fronts and rears with this amp. It's very small. I used some 3M Dual Lock (industrial velcro) to tape it to the back/bottom of the DEH-80PRS. It BARELY squeezed in the front stereo slot width-wise.
I had to reroute the original Toyota wiring harness that is behind the radio up higher a bit in order to get the head unit to fit depth-wise. It really was a squeeze, but it can be done if you work on the wiring harness. Basically everything leading to the automatic ECT box and all of the lighting wiring for the shifter unit had to be moved up and out of the way. With the stereo out, before being moved, the Toyota harness looked like a T going across. The bottom line of the T going down was for the automatic/ECT stuff. I rolled it up. I also had to pull out the top line of the T and lift it up above some white plastic on the left side to make room for the head unit.
Then after relocating the harness and screwing the head unit and amp combo into place (the original Toyota mounting brackets fit, BTW), you have to squeeze the input and output plugs into the GM-D1004 amp blindly (easier than it looks). It's all very tight, but fits. You won't be able to plug it all in first. You can get the wires in the back of the head unit, but not the ones too the amp.
The entire head unit/amp combo can be powered off of the original Toyota stereo harness. I got the correct Toyota adapter to start with, and soldered the Pioneer harnesses to it.
GM-D1004 - Compact Class FD 4-Channel Amplifier | Pioneer Electronics USA
The sub, however, was a bit of a different story. I used a Pioneer TS-WH500A subwoofer. For the head unit, I used the regular plug wires from the head unit to the amp, and then to the speakers. For the subwoofer, I used RCA adapters to feed the signal to the self-powered subwoofer unit. I placed the subwoofer and controls under my seat. I had to use longer rear bolts and ~3/4" metal sleeves to raise the rear of the seat up just a bit to clear the subwoofer's height.
I finally have some bass in the truck. Wow. It's not earth shattering, but compared to some 6x9s way in the back of the bed, having this under my butt is a different world. Nothing to write home about, but solid sound, IMO.
I ran the power wire and in-line fuse up through the hood pop grommet in the firewall, into the headlight harness across the front behind the radiator, and directly to the battery. It's mostly hidden. So power comes directly from the battery, audio and on/off signal from the DEH-80PRS.
TS-WH500A - 8 ¼" HVT Sealed Active Subwoofer | Pioneer Electronics USA
I used Pioneer TS-D1002R 4" speakers up front. I put some XTC shallow foam baffles behind them.
TS-D1002R - 4" 2-Way Speaker | Pioneer Electronics USA
XTC 4" Speaker Baffles (Slim-line: 2-5/8" depth) Protect your speakers at Crutchfield.com
I used Pioneer TS-D1302R 5 1/4" speakers in the rear. I plan to put some XTC shallow foam baffles behind them, too. Haven't gotten around to that just yet.
TS-D1302R - 5¼" 2-Way Speaker | Pioneer Electronics USA
XTC 5-1/4" Speaker Baffles (Slim-line: 2-1/2" depth) Protect your speakers at Crutchfield.com
The speakers have integrated tweeters, built in crossovers, and they sound great for their size.
The other thing I did was relocate the 5 1/4" speakers to the rear seat pockets so I can hear them better. A bit of work, but I'm super happy with the results.
Just some blah wood I had lying around, cut to size. It's a tight fit to leave enough to both hold the speaker, and have clearance for it to rock into place. I ended up putting a couple more washers behind the top screws to get the angle of the speakers to go straight up and down correctly.
Back side. I cut a slit in the wood to fit the divider in the cup. I also drilled a wire access hole in the back. In hindsight I would have made this a bit lower as it wants to interfere with rocking into place at this height.
A couple layers of 1/4" plywood stacked to clear the front of the speaker.
Velcro to attach the front grille I made. I ended up stapling it to both the enclosure and grille so they'd stick and not peel off.
Test fit of the grille wood after painting. 1/4" plywood.
And covered! I used some 3M spray glue to glue on some aluminum sheet to protect the hole. Then I painted it gray and used spray glue and staples to cover the grilles with fabric to make them "hidden" when installed.
And installed!
The DEH-80PRS also has auto-eq and time alignment. Seemed like a goofy unnecessary feature, but it really helped clarify and focus the sound for me. You place a mic they give you on the headrest, let it do its thing for about 5 minutes (clicks, hums, etc.), then your speakers are time aligned for how far they are from you, and it does a rough EQ. The time alignment really makes a difference. I adjusted the EQ a bit to get it punchy, but it wasn't crazy far off.
Very happy with this system.