speaker matching question

[slowpokerhino]

If I were to put 1 25 watt speaker & 1 75 watt speaker in a 2x12 cab would it be safe to use with my 100 watt head?

[MKB]

If both speakers are the same impedance, that would split the total power between the two, thus they would get 50W each. That might be a bit much for the 25W speaker.

[lowenzz]

If I were to put 1 25 watt speaker & 1 75 watt speaker in a 2x12 cab would it be safe to use with my 100 watt head?

no, your cab would be considered a 25 watt cab at that point.

[SteveD]

It would actually be considered a 50 watt (handling) cab as the load is shared between the two drivers equally if they have the same impedance.