I either just had an epiphany or an incredibly stupid thought, you decide. The premise is the reason which sparked the thought so read that for understanding first. Premise: When running a tube head into a cab, the speaker wattages must ADD UP to at least the output RMS wattage of the head itself. So at this point we can see that there is some kind of summing factor where it is not the individual speakers that matters but the combined total. And this may also mean that each individual speaker is somehow affected by the ones around it in a passive way. Question: If you had a 4x12 cab loaded with Vintage 30 speakers, would the individual speakers sound or respond differently than if you had the same 4x12 cab with two Vintage 30's and two of a different kind of speaker? Say for example the G12T75, which is a 75 watt speaker with a different frequency response curve.