This dizzying array might seem like overkill, but Sony's premium "Experience Balanced Armature" (XBA) 'phones are carefully targeted at different price points and types of listener. You've got the entry-level XBA-1 containing a single full-range driver. Add a woofer for bigger bass and you get the XBA-2. The XBA-3 also squeezes in a tweeter for high-freq perkiness, while the XBA-4 rounds it all off with a super woofer. Each pair also has a smartphone twin with inline controls, denoted by the iP suffix.
Engadget, Sony releases XBA balanced armature headphones, eleven times over
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