The AlphaTheta HDJ-F9 brings ultra-low-latency wireless monitoring to a professional on-ear DJ headphone. AlphaTheta's SonicLink wireless technology keeps latency as low as about 9 ms, so cueing, beatmatching, and even scratching feel as immediate as a cable, with a range of roughly 15 m in open space. Touch the HDJ-F9 to a SonicLink-equipped mixer such as the DJM-V5 to pair, or add the separately sold HP-TX01 transmitter to go wireless with gear that doesn't have SonicLink built in.

Away from the booth, Bluetooth 5.3 handles everyday listening with SBC and AAC codecs, multipoint pairing for two devices at once, and one-touch Google Fast Pair and Windows Swift Pair. Battery life runs about 9 hours over SonicLink or about 25 hours over Bluetooth with the status LED off, a full charge takes about 2.5 hours over USB-C, and a 30-minute top-up gives roughly 2.5 hours of play. A 1.2 m coiled cable with an L-shaped plug is included for wired monitoring.

Inside each closed housing, a 40 mm dome driver with a PEEK-PU-PEEK composite diaphragm and a bass-reflex chamber delivers tight sub-bass and balanced mids and highs with minimal distortion, across a 5 Hz to 30 kHz response. The optimized internal structure isolates better than typical on-ear designs, so you can monitor comfortably at lower volume.

Swivel-mounted hangers and a flexible silicone headband make one-ear monitoring natural, a die-cast aluminum slider stands up to nightly use, and the whole headphone weighs just 285 g without… read more the cable. The HEADPHONES CONNECT app lets you set the status LED color, rename the headphones, configure auto power-off, locate them with Find My Headphones, and install firmware updates. A built-in microphone handles hands-free calls.

Features:

- SonicLink wireless with approx. 9 ms latency and approx. 15 m range
- Bluetooth 5.3 with multipoint, Google Fast Pair, and Windows Swift Pair
- Up to approx. 9 hours (SonicLink) or approx. 25 hours (Bluetooth) of playback
- USB-C charging: approx. 2.5 hours to full, 30-minute charge for approx. 2.5 hours of use
- 40 mm dome drivers with PEEK-PU-PEEK composite diaphragm and bass-reflex chamber
- 5 Hz - 30 kHz frequency response, 32-ohm impedance
- Swivel hangers, flexible silicone headband, and die-cast aluminum slider
- Built-in microphone for hands-free calls
- HEADPHONES CONNECT app for LED color, naming, auto power-off, and firmware updates
- Includes 1.2 m coiled cable, 6.3 mm plug adapter, USB-C charging cable, and carrying pouch

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