Hey Bob,
The only thing wrong is that the level is WAY too low. The bulk if the reading should be running through the middle of the 75 dB Target.
Other than that it looks normal. All the raggedness is comb filtering, caused by reflections in the room. Only a ton of treatments would do away with it. Fortunately, our ears are very forgiving. Mics don’t “hear” the way our ears do.
Use 1/3 or 1/6-octave smoothing to get an idea of what the underlying trend in response is.
Regards,
Wayne
