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My JBL 305p MKii's sell sheet telling this ↓ What does it mean?

Hi. I'm trying to buy my new pairs monitors. I'm looking something under 180USD / Specially between 130 to 150. I'm going to produce Electronic Music and Mix, speacially Techno, Dub Techno. My alternative buying choices are JBL 305P Mkii (2nd Gen) Eris Presonus e5 Xt Mackie MR524 If you hava...