The 1960B cabinet has a straight front. This means that all four speakers face out in the same direction, which gives the 300 Watt 1960B a more focused sound. Because the 1960B isn’t angled, it has a larger cabinet which has a lower resonant frequency. The effect of this is that the 1960B produces a slightly thicker sound.
The focused sound and enhanced lower mids of the 1960B make it a favourite of many professional players. Together, the 1960A and the 1960B make the revolutionary and iconic Marshall stack.