I had to smile GSS61, when I read about your mobile applications of "voicing" audio systems..
Oh, BTW. NEVER,EVER attempt to voice a mobile sound system while it`s parked in a garage/building !!
As soon as you drive out all the important LF tuning/voicing GOES straight into the crapper, and you don`t have to ask me how I KNOW/LEARNED this little LF wave length tidbit !!
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I have, but have not re-installed in my recently restored 1987 Chevy Astro cargo van a 5 way tri-amp`d system with L/R 31 band Peavey rack mount Pro-sound 1 RU equalizers that are powered by a 100 watt + and - 25 DC volt output 12. v in SMPS removed from a late seventies Fosgate PR2100 4 channel mobile power amp.
And of course I built a well mounted open frame oak rack for all the gear to be mounted in..
And carefully voiced with my Ivey IE 30A RTA in 1988.
With big Orion mono configured power amps feeding Cerwin Vega home down firing subwoofers cabinets with high performance Infinity badass replacement 4 ohm 12" drivers installed.
I even installed high up in the rear corners of the back (2) RS Minimus 7 speakers each fed by the only non Orion power amp(100 watt Alphasonic) in the system for a early seventies Quad surround sound via a small EV home H-Fi accessory box (also modified to be fed from the same SMPS) matrix quad decoder/synthesizer for a very cool rear ambient sound stage that flipped out my guitar/bass player customer/friends. They said it was like being on a great sounding stage..
And that made me feel good, because I knew they had better ears in that area than me.
And if I might add, that sound system had/has no hearable electrical noise, via careful attention to low impedance star grounding & single source 12 volt power feed...
Yea, went down that mobile sonic road.
A lot of people who heard that very sonically clear and balanced mobile sound system told me that I should enter it in car audio shows, but I wasn`t interested, and only did it for my own demented HQ sonic pleasure and didn`t care about anything else.
Thanks for your interest and input Sir. Damn !! I`m a long winded son of a gun !!
Sorry about that..
Kind regards, OKB