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Freak, you're completely wrong about the 7506's being a cheaper version of the 7509's. The 7506's are actually a much older design, dating back to 1985, when the now-classic MDR-V6's (not to be confused with the newer MDR-V600's) were first introduced (and during a time long ago when Sony actually cared about quality and performance). But these days, Sony's expensive new headphones are a sizable step down from their predecessors in both quality and performance -- in other words, Sony's newer expensive headphones are just as disposable as their really cheap models. (Like, the MDR-V600's were intended to replace the MDR-V6's back in 1992 -- but they sound much, much worse than their MDR-V6 predecessor! But Sony has kept the MDR-V600's in the line for so long, because they either haven't come up with a suitable replacement or their North American distributors had stockpiled so many pairs of those 'phones which Sony's official American/Canadian distributors couldn't get rid of quickly enough.
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