Can I plug my 16 ohm Marshall cabinet into my Fender Twin Reverb instead of using the Twins 2x12s?
For short term use it is generally not a problem, but, if this is to be your permanent set up I would advise to rewire the cabinet to 4 ohms. To do this wire all the speakers in parallel (all positive terminals together to the jack tip and all negative terminals to ground). When using mismatched impedances between the amp and speakers there is a greater strain on the output stage. Total output power to the speakers is reduced, the tonal balance changes, and part of the output signal is reflected back to the amp. This reflected signal can exceed the voltage ratings of your output tubes and cause them to arc or short out – even worse the output transformer can be damaged. Try to keep the output below maximum, this will prevent possible problems.
