THE BLEEDING..looking at the catalogs..it would appear that it was up to the owner of the amp...you could match the head with any cab that you wanted to plug into to..it was mix and match...your call...and, it was what your ears was looking for....one cab? ten cabs? it was up to you...any of you model t owners out there in sunn land will tell probably the same thing....it was up to what type of guitar you were playing thru it and how much boom you wanted to create..hope this helps...smiles BOB from mass