So JBL’s new Partybox 320 and 120 are surprisingly portable cause the 120 is relatively small, and the 320’s built in wheels just makes it super easy to roll this speaker around. However, if you’re looking for something even more portable, then you’ll might want to look at the JBL Boombox 3. Now yeah, the JBL Boombox 3 is more portable and durable… but it costs almost as much as the Partybox 320. So naturally, how does the boombox 3 sound when compared to either the Partybox 320 or Partybox 120.