[quote name='omikin' timestamp='1389436750' post='2334086']
This might be a really stupid question, but am I right in thinking that if I run my Fender Bassman 100 into my Barefaced Super 12 then I can pretty much turn the amp as loud as I like without fear of damaging the cab?
As in will my hearing be destroyed before the cab is, or do I still need to listen out for tell-tale farting noises or something?
[/quote]
Are you talking the Bassman 100 valve head, or the SS Combo?
If it's the valve head, you'll be absolutely fine putting it through the Super 12, as it can take a silly amounts of power.
If it's the solid state combo, you will not be able to add the Super 12. The minimum impedance for that amp is 4ohms, and it's already paired with a 4ohm speaker. Adding the Super 12 would make 2ohms, which would be a bad thing.
If, however, you could bypass the internal combo speaker, and plug into the Super 12 instead, you should be fine. And loud.