I'm playing two 1971 Marshall full stacks at the same time (Daisy chaining), using a 1971 and a 1973 Marshall JMP Super Lead. One stack has two model no 1960 Cabs (G12M25 75Hz) and one has two model no 1982 Cabs (G12H30 55Hz). We're comparing both full stacks to each other and to the resulting Wall!