The PDX-5 is good since it has no adjustments necessary on the amp, itself. The head unit controls everything, to include subwoofer level. Bottom line, on the PDX-5, there are no control knobs.
I didn't have to bend the kick plate on the back of the seat at all. My amp sits in the the cavity between the front seat base and the rear foam bit. I only raised the amp for air flow and to clear those overly-large home-use RCA plugs. The crossrods underneath the seat that simultaneously unlatch each seat adjustment ratchet clears the four pegs at the corners of the amp top by about 5mm. Those plugs can be removed, though, as they are for stacking multiple Alpine amps of the same design on top of each other. Having those plugs on just finishes the look on the top, but also adds about 1cm to the overall height of the amp.
These minuscule clearance measurements were only accomplished through trial and error, constantly removing and placing the seat back into position (a good upper-body workout), to ensure no issues. I spent about 14 hours on it Saturday (to include about 3 hours just running the power through the firewall, I used the little square opening just a few inches below where the throttle cable, itself, goes through the firewall), 5 hours Sunday, and just 1 hour yesterday to install the front door speakers. It took much longer as I am living in a dorm set-up right now, which included too many back and forths between the VX and my room.
As for the NAV voice turn-by-turns, I can set it for Front Right, Front Left, or both Front Left and Right. All three settings stops all music, now (remember my front and rear are powered off the same RCA set). One would think that by selecting just Front Left, the music would continue through the left channels...no, that would be too easy. For whatever reason, it cuts off all music, now, to include to the subwoofer...go figure. I think I'll just turn off the voice and leave on the Tone that proceeds the voice. For whatever reason, the Tone, itself, doesn't interrupt the music. Odd.
Thanks for the suggestions and comments.
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