I understand bypassing the fuse/attenuator does nothing to the frequency response, sorry if my comments were unclear. I'm bypassing for the same reason others do, to clean up the treble.
As far as the crossover, I was planning on trying a 25uF cap (already have some on hand) for the tweeter instead of bringing the bass panel up. I've read that some 2.5R came that way from the factory, presumably a design tweak before the 2.6R redesign.
So far I think I've managed to bypass the fuse, am I correct? How can I bypass the attenuator?