Guess How Big My Speakers Are

what do you account the two large dips at 150 and lesser at 250 Hz in your room? I’m guessing you used a white noise sweep as your source tone?

That and the peak at 30 Hz is all room/speaker/microphone location related.  Some of this would probably get smoothed out if I used multiple locations for the mic and averaged them out.

OmniMic uses swept sine waves, not really noise for these measurements.

it is impossible that you are actually getting as much output at 20Hz as you are in the midband.

@herman In an anechoic room you’d be correct. The room however bedevils those expectations, and that’s the point of the posting. Without these measurements I could do sooooo many things wrong in attempting to improve the quality of the bass.

At some point over the holidays I'll take measurements at different volumes, I am pretty sure that we won't be able to maintain the bass output, so it will be fun to see how it cuts out as the power goes up.

Your what?

@erik_squires , different mike places and volumes would be interesting in themselves, but the averages would be an education. ;)

Have a pleasant Xmas.

I guessed the closest. SF Grand Piano uses 6.5" woofs