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The black FiiO F9 are a pair of high-resolution in-ear monitors that utilize a hybrid driver design with a single 9.2mm dynamic driver and two balanced-armature drivers, which combine to provide a frequency response of 15 Hz to 40 kHz. The F9 employ MMCX connectors and feature two interchangeable cables. The 3.5mm single-ended cable has in-line controls for playing/pausing songs, switching tracks, and volume adjustment, and there is an integrated high-quality microphone. The balanced 2.5mm cable is made from silver-plated copper wire for a balanced sound signature and a high level of detail with broad channel separation. The F9 ship with a waterproof carrying case and six pairs of ear tips.