JBL Xtreme 4 - sound analysis (Patreon)

The Xtreme 4 has a strongly sculpted response, which is definitely more colored than from the Xtreme 2 or 3 (unfortunately I have no Xtreme 2 measurement by hand). 

The bass reaches slightly deeper on the Xtreme 4 compared to the 3 with more boost overall, but lacks mid and upper bass. This may have been decided to make the bass stand out more while avoid boominess. It works well and makes the speaker really kick especially with electronic music but it sounds quite weird with normal music and jazz, where single bass notes will always be softer while others louder. Also treble is boosted more than on the Xtreme 3, which simply has the more balanced sound overall. The Xtreme 4 already loses bass a lot above 60% volume and starts sounding a bit harsh at levels close to maximum.

Below the measurement of all EQ presets, unfortunately none of them manages to fix the bass hole in the 100-200hz region.