I've had the IWOW M22 and listened for a short time leaning up against the wall, before sending them back for the OW M22 (Had problems in wall that caused me not to be able to install them.) I think that the IWOW had a slightly better bass extension, but memory may not serve me well here and they were not mounted in the wall.

https://docs.google.com/spreadsheet/ccc?...amp;usp=sharing