Has anyone put a switch on this so the stock configuration or altered configuration could be toggled in and out? Seems like that would solve the problem of low-level sound lacking some mid-range bass. I guess it would be like a loudness switch - problem being it would be easiest to install in doors making the passenger side one a little hard to reach...

Thinking some more I came up with a DPDT rocker switch configuration that would wire to the amp side of the terminals and run a single lead to a rocker on the console. Seems this would provide flexibility and make the mod complete. The switch would have to be of the type "ON-ON" so that the two-position switch would toggle between the two modes. Here's a switch that fits the technical requirement though I have not evaluated it for fit:

McMaster-Carr number 7194K32

(search on number above to see details)