Avalon Amplifier and Headunit install photos

5-channel amplifier install: 
I ran the power cable through the driver's (USA) side firewall near the brakes , being careful to not let the cord interfere with the break pedal operation even under worst care scenarios.  


I used the drivers side as the battery is on the driver's side and it is a fairly short run back. 

I later did the 5-channel amp, and it was a lot of work. More than expected perhaps 5 or 6 hours over two days, an hour or two taking everything out that I have to.  
Both kick panels utilize a plastic nut to fasten them.  Taking off the sides is a crucial first step to fishing cords from headunit to trunk. 
Another hour or less to fish the power cable up to the battery which I ran on the drivers side to try to shorten the length of cable in the engine compartment.

Then bringing that power cable back to the trunk via door sills.  I snapped the sills out and the pillar partially out.

Front door sills have a bit of room for the power cable. 

The rear sills come out as a set 

Rear sills out and wire can be run to the trunk without removing seat back or bottom. Best to have two people and fish it through. 

Wires behind an aftermarket headunit in 2016 Toyota Avalon
Very intimidating like this.  But I used Maestro's wiring diagrams and it helped me get through it.

The next step was running the 6 channel RCA cables to the trunk (as well as a remote power lead) and 4 speaker wires that splice with the stock wiring. I did a really basic install for the first several days just to tune the system in. The infinity 4555a amp didn't need any increase of the gain on the 4 channel side of the amp, but on the subwoofer side, it did need need quite a bit of increase until I turned up the "sub eq" dial which seemed to attenuate the signal at minimal settings.  



Infinity Reference 4555a 5-Channel Amplifier in rear sear of Avalon, next to dashboard piece for size comparison.





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