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I recently bought a measurement mic and have been experimenting with looking at speaker frequency response. I am surprised at how even a small difference in the measured response across the band can make a big difference in the sound of the tonal balance.

For example even a 3 dB tilt across the spectrum changes the sound from "warm" to "cold".

The measurements seem useful for determining the extent of the response ie down to 30 Hz vs 60 Hz or up to 15 kHz vs 10 kHz but not very useful for overall tonal balance.

Mark