As a quick and dirty test:
- Set up the undamaged monitor in a quiet environment.
- Reset all settings to default, if applicable.
- Point any microphone of reasonable quality on-axis to the tweeter, maybe placed 2ft away.
- It’s fine if this isn’t a measurement mic; we only care about differences, not absolute data.
- Using your analysis software of choice, take a transfer function measurement of the known-good speaker and save it.
- Dual-FFT ala Smaart/OpenSoundMeter is ordinarily my preference for expedient work.
- However, Room EQ Wizard (like other swept-sine analyzers) is likely the better tool here as you can also measure distortion/waterfall plots. Which I would do. 🙂
- With the data saved, remove the good monitor and replace it with the suspect monitor. Re-measure and save.
- Same position, same angle, same settings, etc. Minimize other variables.
Compare the two sets of data, particularly in the tweeter’s passband, allowing some margin for error. Check for deviations in frequency response, increased harmonic distortion, etc.