Minirig Summed Low Pass Bridge Mode Adapter for Subs

Been playing around with a couple of new SiliconChip kits.  The Multi-Function Active Filter KC4580 and the Bridge Adapter for Stereo Amps KC4569.
bridge mode adapter

After a friend mentioned that he wanted to run his subs using his amps in bridge mode I thought I would try it myself. This is what I built (click pic).