SPL meter: FR tests: Can it show me anything useful?

[mondogenerator]

Now im aware SPL meters arent up to alot now a days, with ARTA and the like, but I am wondering if an SPL meter can actually show me anything useful about the speaker in my room.

Im aware I cannot separate the room resp from the driver response, but is there anything at all of use that a SPL plot using a meter can show me?

[Mooly]

Maybe... First, you might be surprised at the actual SPL levels you use. You might also find spots in the room where the level drops away due to reflections. I can certainly observe that with a meter and a test tone.

[mondogenerator]

To start i ran a plot up to around 2k using a mobile app. Its certainly not very accurate, but i can borrow a good pro SPL meter, this was a dry run. Speaker and meter placement would greatly impact the result id imagine, and reflections and room modes would be in the jumble of a result too, at a guess. Seeing swings of 20db makes me believe the room is the greater part of what im seeing. Thanks Mooly.