The not-so-simple way would be to measure them.
You would need a signal generator with amplifier, a multi-meter, and an SPL meter.
You can use your PC as a signal generator; there are many free programs that will generate arbitrary sine waves. I assume that you have an amplifier already. You just need to adjust your output sine wave to be 2.83 volts peak-to-peak, then measure the SPL at one meter. This will tell you the sensitivity.
If you want to know efficiency, then adjust the voltage such that your speaker is dissipating one watt.
You would need a signal generator with amplifier, a multi-meter, and an SPL meter.
You can use your PC as a signal generator; there are many free programs that will generate arbitrary sine waves. I assume that you have an amplifier already. You just need to adjust your output sine wave to be 2.83 volts peak-to-peak, then measure the SPL at one meter. This will tell you the sensitivity.
If you want to know efficiency, then adjust the voltage such that your speaker is dissipating one watt.
I agree with sreten. Put them up against a known set and do an A/B comparison. While it won't give you a number, it will tell you if they are more or less efficient/sensitive.
joe carrow said:
He will also need to measure at many different frequencies to average out the effect of the room.
Dan
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