http://www.mediafire.com/?ac7dxibioq08yjj
The test rig is an 18w Marshall which is played clean and dirty through various cabs to demonstrate how speakers/cabs shape the sound. This isn't a totally exhaustive comparison that would also include different amps, settings, guitars etc... but it is definitely a really useful collection for comparing the general differences IMHO.
The cabs/speakers used include an Orange PPC412 with the standard V30s. One of the most interesting differences for me was between the Orange 4x12 and Mesa 4x12 with V30s - you can hear that cab construction does actually make quite a difference to the final tone, even when close micing.
Again, to be clear, I did not record these myself!
Hope someone finds this useful
