My install is double DIN in my Volvo, but it was brilliantly simple and fit perfectly (damn installers still charged me mucho though it was so simple).

Here's a link to the original thread. The MPSS-4 source switcher is great for an empeg/CD-radio setup. When the empeg is the primary, it remains powered on when you put it in suspend mode to activate the CD-radio. And it wakes up instantly on any button press, cutting the power to the CD-radio. Well, that is, if you use an external amp for the setup.

Here's one of my very first posts, talking about the setup of the switcher.