Hot Rodding Magnaplaners

Here is a good starting point.
http://www.integracoustics.com/MUG/MUG/tweaks/index.html

audio asylum has more information than you will ever require on the planers

I am in the process of hot rodding my 3.6's, new crossovers(replacing both internal and external with one external), internally rewired, no more fuses or tweeter attenuator bypass, custom frame/stands and the best part NO more horribly factory magnepan binding posts! I will have pictures posted soon, and in the mean time there is a lot of information over at audio asylum as the others have suggested.