How To Calculate Wattage With Mismatched Speakers

[hardys]

Can someone please provide the formula to calculate the total wattage when combining 2 speakers in parallel of different watts? I'm thinking of pairing an EVM12L with a Celestion G12H30, but don't want to blow the g12h with my 50 watt Fuchs.

[Old Tele man]

...are they both the same impedance? or, is one Z greater than the other?

...need to know Z & Pwr for each speaker.

[hardys]

...are they both the same impedance? or, is one Z greater than the other?

...need to know Z & Pwr for each speaker.

Both speakers are 8 Ohms. EV is 200 watts, G12H is 30 watts.

[Old Tele man]

...since both have same Z, as soon as your amplifier output power exceeds about 60W, the G12H will be "overloaded".

...beyond about 60W output, the EV is OK, but the G12H isn't. With equal Z's, the power is equally distributed (usually), but can vary by ±20% due to speaker to speaker differences.

...of course, while playing you won't exactly know what wattage the amp is cranking.

[Adwex]

Very simple. The weakest speaker (lowest power handling capability) determines the max power handling for the whole cab. If all speakers are the same impedance, the power will be distributed equally amongs the speakers, so....

Max. power handling for cab =
(max power of weakest speaker) X (number of speakers)