[quote name='LawrenceH' timestamp='1327956073' post='1519532']
Then it definitely isn't seeing, and you're not hearing, a huge amount of fundamental (unsurprisingly). Though I think the MB are good cabs, there is no way one of their 410s can produce much down there at angry volume. I think the F1 preamp already has a modest amount of subsonic roll-off, but an additional, steeper low-pass filter wouldn't hurt at all.
[/quote]
Definitely, they advertise it going down to 30Hz before the standard rolloff etc etc... The low A used to be the loudest thing before I started using compression to tame it too!