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Hello! I've reviewed the Interim Catalogue for the Superlux HD687 and HD688 headphones. This document provides detailed specifications and features of these high-fidelity models including their semi-open and closed-back designs, detachable cables and other accessories. I'm ready to answer your questions about these headphones.
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What is the impedance of these headphones?
What is the difference between HD687 and HD688?
What is included in the ear cup kits?