I got a few of those "fuses" and put a new one in.
I called my local Music Shop, Main Drag Music:
http://www.maindragmusic.com/
The guy I spoke to, describing how the cab sounds, he said without hesitation, "The speakers are trash". But I'm not sure I believed him. He said the L-pads in those GII's are very robust, he's never seen one blown (although there is a first time for everything).
So I decided to do more tinkering. I tried each speaker individually with the existing L-pad. Each speaker has the same distortion.
Removed the L-pad and hooked up an old Carvin L-pad that I have. Same distortion.
I took an ohm reading of each speaker. each one reads 4.5 ohms
The horn reads 7.4 ohms
When I press down on the cone, my ohm meter flips out and started jumping around all over the place; as high as 112 ohms even.
I'm starting to think that the guy I spoke to is right. I'd have to belive that the speakers are trashed....
And that's OK because I wanted to replace them all anyway and make it a 4 ohm cab.
The guy at the store suggested Eminence Delta 10's (standard, Non-NEO...he doesn't like how NEO's sound)) to a good meat & potatoes speaker. For more abusive situations, he'd suggest Kappa's.
What do y'all think?