mistermikev
Experienced
well I sure hope someone like @Admin M@ or other will answer that. I don't know. My gut is that it doesn't matter - at least not in the sense that you can "overpower" a speaker like a real speaker because an ir is really just a very detailed eq curve. impedence curve is a measure of resistance at freq if I understand it correctly. iow the ir doesn't really have an impedence but it will have a dif "resistance" to dif freq.It is also what i did but i ve tried tons of irs and i was asking to myself if in general there is also more to know without waste time... Example the wattage of the amp and the cab resistance how does it works in the axe?
save time: well... in general there is a lot of info in the (yek?) writeup about amps and what their default speaker should be... and generally speaking you will get the most out of an amp by sticking to speakers similar to the original factory speakers... but in practice I find that lots of unexpected combos sound great. For example I love to put a 4x10 with a twin or other fender... sure the 2x12 is better for really clean things but a 4x10 can sound great. hope something there is usefull.