B 'base' or 'straight' cabinets offer some sonic differences to the familar angled cabs. The additional size of the straight cab gives it a lower resonant frequency for more bottom-end and with all speakers facing the same direction, a more focused sound. Many players prefer to use only the B cabs, even when they are on stage with a full stack. Zakk Wylde (Ozzy's guitarist) uses only the B cabs because of the tighter low end and because (believe it or not) he values his hearing and the sound from the B cab doesn't hit him directly in the head.