HDJ-F9

AlphaTheta HDJ-F9 Wireless DJ Headphones with SonicLink and Bluetooth

Take your DJ monitoring beyond the cable with the AlphaTheta HDJ-F9 Wireless DJ Headphones. Featuring AlphaTheta's SonicLink wireless technology, ultra-low latency, and powerful, detailed sound, the HDJ-F9 is designed for DJs who need precise monitoring and freedom of movement in the booth. With latency as low as 9 ms, these headphones let you monitor mixes and scratch wirelessly while staying focused on your performance. Combining professional DJ monitoring features with Bluetooth connectivity, durable construction, and customizable settings, the HDJ-F9 adapts to your workflow whether you're performing live, preparing tracks, or listening between gigs.

SonicLink Wireless Monitoring with Touch Pairing

AlphaTheta's proprietary SonicLink wireless technology delivers high-quality sound, powerful output, and ultra-low latency for responsive DJ monitoring without a traditional headphone cable. Latency as low as 9 ms helps keep what you hear closely aligned with your performance. The added SonicLink touch pairing feature makes connecting to compatible DJ equipment simple. Touch the headphones to supported gear, such as the DJM-V5, for convenient pairing. Touch Pairing requires compatible equipment with the latest firmware. The separately sold HP-TX01 SonicLink Transmitter expands connectivity to a wider range of devices.

Powerful Bass and Clear, Detailed Sound

Developed for the demanding environment of a DJ booth, the HDJ-F9 features newly developed 40 mm drivers that reproduce powerful low frequencies extending into the sub-bass range. A bass-reflex chamber in each housing helps deliver the defined attack of basslines and kick drums, while the PEEK-PU-PEEK composite-film diaphragm helps suppress unwanted vibration for balanced mids and highs with minimal distortion. The closed-back design and optimized internal structure provide effective sound isolation compared with other on-ear models, helping you monitor music in loud environments without unnecessarily increasing volume.

• 40 mm dynamic drivers: Powerful, full-bodied sound for DJ monitoring.
• 5 Hz–30 kHz frequency response: Broad frequency coverage for detailed listening.
• Bass-reflex chambers: Help reproduce tight, clearly defined low frequencies.
• Closed-back construction: Helps isolate your monitoring from surrounding sound.

Comfort and Durability for Professional DJs

The HDJ-F9 is designed to accommodate different monitoring styles. Swivel-mounted hangers and a flexible silicone headband support one-ear monitoring and shoulder-resting positions, giving DJs the freedom to work the way they prefer. A durable die-cast aluminum adjustment slider adds strength for regular use, and the headphones have passed international durability tests designed to assess professional reliability.

Customize Your Headphones with HEADPHONES CONNECT

The dedicated HEADPHONES CONNECT app lets you personalize settings and manage useful headphone functions from your smartphone.

• Customizable Status LED: Adjust the LED color and brightness to suit your preferences.
• Personalized settings: Rename your headphones and configure automatic power-off and voice assistant settings.
• Find My Headphones: Play a sound to help locate misplaced headphones; Android devices also support Find Hub compatibility.
• Firmware updates and support: Access updates, tips, and additional support functions through the app.

Bluetooth Multipoint and Extended Listening

Beyond DJ monitoring, the HDJ-F9 offers Bluetooth 5.3 connectivity for everyday wireless listening and calls. Multipoint Bluetooth allows the headphones to connect to two devices simultaneously, such as a smartphone and computer, for convenient switching between sources. Google Fast Pair and Windows Swift Pair support simplified pairing with compatible Android and Windows devices. The built-in microphone also supports hands-free calls. Battery life varies by connection type and Status LED setting:

• SonicLink: Approximately 7 hours with the Status LED on or 9 hours with it off.
• Bluetooth: Approximately 13 hours with the Status LED on or 25 hours with it off.
• Charging time: Approximately 2.5 hours for a full charge.
• Quick charging: Approximately 30 minutes of charging provides around 2.5 hours of use.

Key Features

• SonicLink wireless technology: Ultra-low-latency DJ monitoring as low as 9 ms.
• SonicLink touch pairing: Convenient pairing with compatible DJ equipment.
• 40 mm dynamic drivers: Powerful bass and detailed audio reproduction.
• Effective sound isolation: Closed-back design optimized for DJ monitoring.
• Bluetooth 5.3: Wireless listening and hands-free calling.
• Bluetooth multipoint: Connect to two devices simultaneously.
• HEADPHONES CONNECT app: Customization, device-finding functions, and firmware updates.
• Durable construction: Die-cast aluminum adjustment slider and flexible monitoring design.
• Detachable coiled cable: Supports traditional wired monitoring.
• USB-C charging: Convenient rechargeable battery.

Specifications

• Model: AlphaTheta HDJ-F9
• Headphone Type: Closed, dynamic
• Driver Size: 40 mm dome type
• Frequency Response: 5 Hz–30 kHz
• Impedance: 32 Ω
• Output Sound Pressure Level: 106 dB
• SonicLink Transmission Range: Approximately 15 m in unobstructed locations
• Bluetooth Version: 5.3
• Bluetooth Transmission Range: Approximately 10 m in unobstructed locations
• Bluetooth Profiles: A2DP, AVRCP, HSP, HFP
• Bluetooth Codecs: SBC, AAC
• Charging Connector: USB Type-C
• Weight: 285 g without cable
• Warranty: 2 years

What's Included

• AlphaTheta HDJ-F9 wireless DJ headphones
• 1.2 m coiled cable, extendable to approximately 3 m
• 6.3 mm stereo standard screw-on plug adapter
• 0.5 m USB Type-C to USB Type-C charging cable
• Carrying pouch
• Quick Start Guide
• Precautions for Use documentation

Wireless Freedom. Professional DJ Performance.

From ultra-low-latency SonicLink monitoring to detailed bass response, flexible wearing positions, and multipoint Bluetooth connectivity, the AlphaTheta HDJ-F9 brings together the features modern DJs need in one versatile headphone. Move freely, monitor confidently, and stay connected from preparation to performance. Shop NLFX Professional for DJ headphones built to keep up with your workflow.