Thanks for the suggestions.
I spent part of Monday to install my subs, pretty much following the "how to add a subwoofer" directions. The only issue I had was that I needed a metric nut (for connecting power to the distribution block), and had to go to a couple of stores to find that. Else everything went pretty smooth, which is saying a lot for an amateur installer (those afraid to try- there is hope, if I can do it LOL).
BTW- Peripheral Electronics has a new LOC (SVENR) that integrates an auto turn on wire. So I didn't have to tap a 12 volt switched line. You do have to supply it with 12v. I needed a LOC anyway (my amp doesn't have speaker level inputs), and the turn on line was a nice to have bonus
. It appears to only come on when there is audio present, but I need to look at it's operation a little more. It was like $20.
Had to toy with the LOC gain settings, my amplifier gain setting, and equalizer settings (both the in dash unit and the mp3 player I have attached to it via the aux input). Basically had to turn the gains pretty low, and set the equalizer/tone setting to the lower bass settings, since the subs, with about 70 W RMS powering each of two 8"ers, dominated the sound. But now the sound "fits" together and I can "control" the subs to some degree with the bass tone control. I may invest in an amp with a remote bass level control, I strongly suggest getting one of these if you are buying a new amp for a similar project.
I wonder if I might have had more control had I tapped some other lines that are influenced by the fader (fading doesn't seem to effect the bass level, that was the setup I had in my previous vehicle, which was quite nice). But probably the other lines are crossed over such that they don't contain the needed frequencies. It anyway sounds quite good!
I mounted the amp vertically right on the outside of the cover panel where the nav, etc are located (my amp has a footprint about the size of a sheet of paper, so it fits on there pretty well). The subs are both sitting to the back of the cargo area (not a stealth install at all), so I still have a much of my cargo room. I can re-arrange later, or even move to a more 'tailored/stelath' sub box. That will be easy with all the wiring already done. Thanks again
