Put your mic at 1m from the speaker, at tweeter level.
Put your speaker in the middle of your room and elevate it so it's exactly midway between your floor and ceiling.
For measuring make sure you use gated measurements. It will let you get the true response of the speaker without the room reflections affecting what you see. This will likely cut off the response at around 200hz so you won't see what the bass is doing.
To measure bass, go outside & put the speaker on a tall ladder & measure there. Or in an anechoic chamber if there's one nearby.
Lastly, don't just measure on axis (directly in front of the speaker). Make sure to measure off axis as well. 5, 10, 15, 20 degrees should all get individual measurements. Measuring the vertical response is also useful.