Hello Dustin,
As Mojo notes, I'm sure you mean the woofers of the M22s, not the ports.
I suspect you might be overloading the bass drivers of the in-wall M22s by perhaps using the bass boost control on your receiver to boost bass output, or over-driving the system at loudness levels that are beyond the output capabilities of the M22s. I have stand-alone M22s in a room a bit larger than yours, and I run them with an Axiom EP500 subwoofer to handle the bass energy below 80 Hz. Together, they'll play louder than I ever want in my living room.
Are you using a subwoofer? If you like lots of bass, a subwoofer is essential with the M22s. Used without a sub, the M22s have decent bass output to about 40 Hz, and they'll play quite loud, but if you boost the bass output using the bass control on your receiver, it's easy to overdrive the woofers at high volumes.
Regards,
Alan
