Room frequency response measurement: unweighted or C weighted

To measure the room frequency response using a digital SPL meter (one of the AudioTools app on iPad), should I use flat/unweighted or C-weighted SPL option? Thanks

Use a flat response. The weighted ones are for loudness / sound pressure measurements.

(Are you going to use the internal microphone?)

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I bought a DaytonAudio iMM-6 calibrated measurement microphone.

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