Hendog said:
Good luck finding anyone who has A/Bed this. The problem is, to do a successful comparison you must have 2 identical cabs loaded with identical speakers. One must be 8ohm and one must be 16ohm. No one has that.
The tone is said to be darker when running a 16ohm cab out of a 8ohm amp out. A slight power loss is also said to occur.
This would be easy to a/b. Use the same cab and try it in the 8 ohm jack and then the 4 ohm jack. You will hear the difference. Perhaps darker, but the volume will be the biggest difference. To run the numerically higher load at the same volume, you would have to turn up the amp. Obviously with the output higher the power tubes will have more influence on the tone, and you will definately hear that. Problem is that the amp is working twice as hard for half the power, roughly. It's considered a safe mismatch when the speakers have a numerically higher resistance value, but the amp does work harder.
I have two 16 ohm Mesa V30's that I have yet to find a home for. Just holding on to them for safe keeping until I come up with something. The speakers that replaced them are definalely staying in the cab they are in.