Since I deal with real speaker cabs every day, I always measure the speaker impedance. It's rare that an 8 ohm speaker reads exactly at 8 ohms or a 16 ohm speaker reads at 16 ohms. The current parameter can offset the actual impedance, but it would be great for the parameter to read in ohms rather than the current 0.250 - 4.00 range. For instance, I just measured a 16 ohm 4x12 cab that read at 14.5 ohms. If the default impedance was set at 8 ohms, I could raise the value to 14.5 ohms and get a more accurate impedance interaction rather than guessing where 14.5 ohms would be on the 0.250 - 4.00 scale.
It would also make it easier to accurately match models with cabs. A Mesa 4x12 is an 8 ohm cab. So choose your amp model and set the Speaker Impedance control to 8 ohms with a Mesa IR and you have a closer match to the real world amp/cab interaction.
It would also make it easier to accurately match models with cabs. A Mesa 4x12 is an 8 ohm cab. So choose your amp model and set the Speaker Impedance control to 8 ohms with a Mesa IR and you have a closer match to the real world amp/cab interaction.