I've built an adjustable sized speaker and I want to get frequency response curves for it.
My setup to test it is a sine wave generator connected to a power amplifier connected to the speaker which plays into a microphone. The voltage going into the speaker is pretty much constant aside from at low frequencies where it drops off (due to the amplifier).
I have measurements of the voltage going into the speaker as well as the measured voltage in the microphone. I also have the microphones sensitivity.
-39dB re 1V/Pa @ 1kHz (12mV/Pa @ 94dB SPL) ±2dB @ 1kHz
I looked it up but I can't figure out how to convert this to an SPL scale and also how to include the differing input voltage. How do I convert this to SPL and do I need to take any other measurements to do so? I also have the amplifiers specs.