AlphaTheta HDJ-F9

The AlphaTheta HDJ-F9 are professional DJ headphones that go wireless with no noticeable delay thanks to SonicLink, AlphaTheta's ultra-low-latency wireless connection: just 9 ms, compared with the 200-300 ms typical of Bluetooth with standard codecs. Cue and mix accurately while moving freely around the booth.

To pair them, simply bring them close to a SonicLink-compatible device such as the DJM-V5 mixer. With any other mixer, use the HP-TX01 transmitter (sold separately). Away from the booth they work as Bluetooth 5.3 headphones (SBC/AAC) with a built-in microphone for calls.

The new 40 mm driver uses a PEEK-PU-PEEK composite diaphragm, and the closed housing combines passive isolation with a bass-reflex chamber for tight, controlled low end even at high club volumes.

Built for daily use: a swivel mechanism and flexible headband for one-ear or two-ear monitoring, die-cast aluminium sliders and a detachable cable with a bayonet lock so it never pulls out mid-set. The HEADPHONES CONNECT app lets you customise (or switch off) the LED and locate them with Find My Headphones.

• Type: dynamic, closed-back, on-ear
• Driver: 40 mm, PEEK-PU-PEEK diaphragm
• Frequency response: 5 Hz - 30 kHz
• Impedance: 32 ohms
• Sensitivity: 106 dB
• Weight: 285 g
• SonicLink: 9 ms latency, approx. 15 m range (2.4 GHz)
• Bluetooth: 5.3, SBC/AAC codecs, A2DP/AVRCP/HSP/HFP profiles, approx. 10 m range
• Battery life: up to 9 h with SonicLink and 25 h with Bluetooth (LED off); full charge in approx. 2.5 h
• Microphone: omnidirectional electret condenser
• Wired connection: 3.5 mm stereo mini plug, detachable cable with bayonet lock
• Polyurethane leather-style ear pads and silicone head cushion
• Power: DC 5 V charging, built-in 3.7 V lithium-polymer battery

If you also need active noise cancelling and a bundled transmitter, the step-up model is the AlphaTheta HDJ-F10.