If you have not seen it already, the spinorama database (
https://www.spinorama.org/scores.html) is good for looking at the performance of loudspeakers measured here and reliable measurements from elsewhere. Would suggest reading the brief help section and the cited material if you're keen on learning more if these things are new to you.
There are very competent calibrated mics even the $80 usb umik-1 from minidsp is a great option many people love here, there are guides on both here and youtube on how measure and do everything with REW/peq, which is enough to see what kinds of benefits you could get with your current speakers. Worth giving it a try with even just a PC as a source to test if it's not your regular source. The mic will always be useful to reuse if you rearrange the room, change speakers and so on. Definitely the best value/$ anyone can ever spend on a system if you are willing to take a little bit of time to learn and measure. Definitely a great way to also spend another <$100 bucks.