When I listened to the 701s they sounded very detailed and yet quite anemic. All upper mids and treble with lack of natural lower mids and bass. Nowhere near as much accuracy to my ears vs the 7520. As for the MDR-1, just a good middle of the pack HP. Suffers from lack of detail and resolution in the mids with a bit of an accent on upper bass and lower mids. Not bad but the 7520s bring excitement, dynamics, cleaner low bass and clarity to the table vs the MDR-1. That being said I could still live with the MDR-1s.
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