Here's a new review of this xover mod by Tone Audio:
http://www.tonepublications.com/gear/get-more-life-from-your-magnepan-1-6s/
http://www.tonepublications.com/gear/get-more-life-from-your-magnepan-1-6s/
Skiing Ninja Magnepan 1.6 xover upgrade
Any Maggie owners here given these a try?
http://www.skiingninja.com/Magnepan-1-6-Ninja-Noble-p/mag16nn.htm
http://www.skiingninja.com/Magnepan-1-6-Ninja-Noble-p/mag16nn.htm