[quote name='pete.young' timestamp='1423681170' post='2687919']
I think you can now get DI boxes which work off a speaker output, though I've never used one.
[/quote]
I did a studio recording last week using a Countryman 85 DI from the "ex. speaker" out of a fender bassman 100 silverface and it sounded great. The engineer was pleased with the results. Have not tried it live yet but will soon.