If you are wondering XB stands for Extra Bass, and these three new headphones are tailored just for that! These new earphones includes the MDR-XB30EX (4,935 Yen) which comes with plastic housing and a 13.5mm driver unit, the MDR-XB60EX (8,715 Yen) also comes with a 13.5mm driver unit but is made of ABS Plastic while finally the MDR-XB90EX (12,390 Yen) comes with a 16mm driver unit and is made of ABS and Aluminum alloy.
All models features Sony’s Advanced Direct Vibe Structure with for the MDR-XB90EX a 106dB/mW sensitivity at 16Ω.

I got this, one of my favorite. :) excellent Bass
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Thanks for your nice review. Sony MDR-XB90EX In-Ear Extra Bass Earbuds are great for music lovers
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