Imo this loudspeaker has been designed as a wall speaker and it definitely needs a back wall to boost the lower part of the spectrum and compensate the even but too flat pir response, as well as poor sensitivity. On axis response is weird, as a result of shallow slopes of the xover and woofer beaming, but after all the on axis is not necessarily the most relevant one and btw overall frequency responses average quite good (listening window, reflections, pir...). Btw, and because of the smooth overall response, I do not think that applying precise EQ to flatten the on axis response will do any good, because most of the problems on axis are acoustical ones ( beaming and lobbing effects), and obviously any EQ apllied with make the good and even PIR response worse.