AlphaTheta HDJ-F9

The AlphaTheta HDJ-F9 is a professional wireless DJ headphone designed specifically for DJs who want to perform without audio cables, without compromising on sound quality, monitoring, and timing. Thanks to AlphaTheta’s SonicLink technology with an ultra-low latency of just 9 milliseconds, you can mix, cue, and scratch wirelessly while maintaining full control over your music. The HDJ-F9 combines three listening modes: wireless via SonicLink, wireless via Bluetooth 5.3, and wired via the included audio cable. This makes these headphones suitable for professional DJ sets, live performances, studio use, and everyday music listening.

The on-ear design with 40 mm drivers delivers a direct sound with powerful bass, clear mids, and detailed highs. Thanks to effective sound isolation, you can monitor accurately even in a noisy DJ booth. The adjustable construction, featuring die-cast aluminum parts, swivel ear cups, and a flexible silicone headband, is designed for intensive use. With Bluetooth Multipoint, a built-in microphone, customizable LED lighting, and the AlphaTheta HEADPHONES CONNECT app, the HDJ-F9 also offers features that come in handy outside the DJ booth.

Wireless DJing with SonicLink and just 9 ms latency
The HDJ-F9 is equipped with SonicLink, AlphaTheta’s wireless audio technology developed specifically for DJ applications. While traditional Bluetooth connections can cause noticeable delays, SonicLink offers latency as low as 9 milliseconds. This ensures that audio playback remains virtually instantaneous in response to your actions on the DJ controller, media player, or mixer. You can accurately beatmatch tracks, control cue points, and scratch without an audio cable restricting your freedom of movement. SonicLink also delivers high output volume and a stable wireless audio connection. The maximum transmission range is approximately 15 meters in unobstructed conditions. This makes the HDJ-F9 an attractive option for DJs who want to move freely during a performance, stay in contact with the audience, or regularly switch between their equipment and other areas on stage.

SonicLink Touch Pairing and Direct Integration with DJ Equipment
SonicLink Touch Pairing makes it easier to connect the HDJ-F9 to compatible AlphaTheta DJ equipment. Simply hold the headphones against the designated area of a compatible device, and the wireless connection is established automatically. The AlphaTheta DJM-V5 supports this Touch Pairing technology. This means you don’t have to manually navigate through the pairing settings every time you want to connect the headphones to the mixer. The HDJ-F9 can also be used with equipment that already has a built-in SonicLink transmitter, including the AlphaTheta XDJ-AZ and XDJ-AN. With these devices, pairing is done via the SonicLink pairing function. Are you using a different DJ mixer, DJ controller, or audio source? In that case, you can connect the separately available AlphaTheta HP-TX01 SonicLink transmitter to the headphone output of your equipment. This allows you to establish a SonicLink connection without needing an entirely new DJ setup.

The HP-TX01 is not included with the HDJ-F9 as standard.

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40 mm drivers with powerful bass response and precise monitoring
AlphaTheta has developed new 40 mm drivers for the HDJ-F9 that are tailored to the demands of professional DJ monitoring. The headphones deliver full, controlled bass reproduction that extends all the way down to the sub-bass range. This ensures that kick drums and basslines remain distinct, which is essential for beatmatching and assessing transitions between tracks. A bass reflex chamber is integrated into the housing, which helps accurately reproduce the attack of kick drums and basslines. The result is a tight low-end response in which individual rhythmic elements remain clearly distinguishable. The drivers utilize a PEEK-PU-PEEK composite diaphragm. This multilayer construction suppresses unwanted vibrations and helps minimize distortion. As a result, the mid and high frequencies also remain clear and balanced. With a frequency range of 5 Hz to 30 kHz, an impedance of 32 ohms, and a sound pressure level of 106 dB, the HDJ-F9 is designed for monitoring in a variety of DJ environments.

Effective sound isolation in an on-ear design
The AlphaTheta HDJ-F9 features a closed-back on-ear design. Unlike over-ear headphones, where the ear cups wrap around the ears, the HDJ-F9’s ear pads rest on the ears. This compact design aligns with the monitoring style many DJs are accustomed to from models such as the HDJ-CX. AlphaTheta has optimized the internal construction of the HDJ-F9 to achieve a high degree of passive sound isolation. This reduces ambient noise, allowing you to better focus on the music you’re monitoring. Even in a DJ booth with high noise levels, important details in the mix remain discernible. Since less ambient noise gets through, you don’t have to turn up the volume unnecessarily to follow the music. The HDJ-F9 thus combines the snug fit of on-ear headphones with sound isolation tailored for professional DJ use.

Designed for various monitoring techniques
Every DJ has their own way of monitoring. Some DJs wear their headphones over both ears, while others prefer to keep one ear free to continue hearing the sound from the dance floor. The AlphaTheta HDJ-F9 is designed to support these different working styles. The swivel-mounted ear cups can be adjusted to your listening position. This allows you to monitor with one ear or temporarily rest the headphones on your shoulders. The flexible silicone headband conforms to the shape of your head and enhances comfort. The adjustable headband lets you customize the fit to your preference. The height adjustment mechanism is made of die-cast aluminum. This construction provides durability in areas that are frequently subjected to stress in DJ headphones. The HDJ-F9 has also passed international durability tests. Weighing 285 grams, excluding the cable, the headphones remain suitable for longer DJ sets and daily use.

Bluetooth 5.3 for music, smartphones, and computers
In addition to SonicLink, the HDJ-F9 features Bluetooth 5.3. This allows you to use the headphones to listen to music wirelessly from your smartphone, tablet, or computer. The Bluetooth connection supports the SBC and AAC audio codecs and the A2DP, AVRCP, HSP, and HFP profiles. Bluetooth is a practical choice for listening to music, watching videos, and making phone calls. For DJ monitoring, AlphaTheta recommends SonicLink, as this technology was specifically developed to minimize wireless audio latency. The maximum Bluetooth transmission range is approximately 10 meters in unobstructed conditions. Bluetooth Multipoint: Connect to Two Devices at Once With Bluetooth Multipoint, you can connect the HDJ-F9 to two Bluetooth devices simultaneously. For example, you can listen to music from your laptop while your smartphone remains connected to the headphones as well. When you want to switch between the two devices, you don’t have to re-establish a Bluetooth connection each time. In addition, the HDJ-F9 supports Google Fast Pair and Windows Swift Pair. This allows you to pair with compatible Android and Windows devices via an on-screen notification. The built-in microphone allows you to make hands-free phone calls. This makes the HDJ-F9 not only a DJ headset but also suitable for everyday use on the go, at home, or at your computer.

HEADPHONES CONNECT app: Customize the HDJ-F9 to your liking
The AlphaTheta HEADPHONES CONNECT app gives you access to additional settings and features of the HDJ-F9. One standout feature is the ability to customize the LED lighting on the headphones. You can adjust both the color and brightness of the status LED. This lets you tailor the lighting to your personal preferences or the look of your DJ setup, for example. You can also rename the headphones, check the battery status, and configure the auto-off function.

The HEADPHONES CONNECT app offers the following features, among others:
- adjust the color and brightness of the status LED
- change the headphones’ Bluetooth name
- check the remaining battery capacity
- enable or disable the auto-off feature
- configure Siri or Google Assistant controls
- use the Find My Headphones feature
- install firmware updates
- view information and support for the headphones

With Find My Headphones, you can make the headphones play a sound to help you find them more easily. The app communicates with the HDJ-F9 via Bluetooth. While using SonicLink, you cannot change the settings directly through the app. However, settings previously saved via Bluetooth will remain in effect while using SonicLink. When installing, make sure you’re using the correct AlphaTheta HEADPHONES CONNECT app. To do this, scan the QR code from the product documentation.

Up to 25 hours of wireless listening via Bluetooth
The AlphaTheta HDJ-F9 has a built-in rechargeable battery. Battery life depends on the selected wireless connection and the status LED setting. When using SonicLink, the maximum playback time is approximately 7 hours with the LED lighting turned on. If you turn off the status LED, the battery life can extend to approximately 9 hours. Via Bluetooth, the playback time is approximately 13 hours with the status LED on. Without the LED lighting, the maximum battery life increases to approximately 25 hours. The battery fully charges in about 2.5 hours via the USB-C port. If you have less time available, a 30-minute charge will give you about 2.5 hours of battery life. This allows you to recharge the headphones between performances or during a short break. Actual battery life depends on factors such as listening volume, the audio signal, and usage conditions.

Can also be used with the included coiled cable
Although wireless use is the focus of the HDJ-F9, you can also connect the headphones the traditional way. The included coiled cable is 1.2 meters long and can be extended to approximately 3 meters. This gives you plenty of freedom of movement when standing close to your DJ equipment. The cable features an angled connector and comes with a screw-on 6.35 mm stereo jack adapter. This allows you to connect the headphones to DJ mixers, controllers, audio interfaces, and other equipment with a compatible headphone output. The wired connection is also convenient when you don’t want to use wireless audio or when the battery is dead.

Compact for travel and optional protection
The HDJ-F9 features a compact design that allows the ear cups to fold flat. This makes the headphones take up less space during transport. A storage pouch is included as standard to keep the headphones and accessories together. For DJs who regularly transport their equipment, the AlphaTheta DJC-F CASE is also available. This optional carrying case is designed to provide the HDJ-F9 with extra protection during transport. The DJC-F CASE is sold separately and is not included as standard.

AlphaTheta HDJ-F9 features:

• professional wireless DJ headphones
• closed-back, dynamic on-ear design
• SonicLink wireless audio technology
• Ultra-low SonicLink latency starting at 9 milliseconds
• SonicLink Touch Pairing with compatible DJ equipment
• SonicLink connection with built-in transmitters in devices such as the DJM-V5, XDJ-AZ, and XDJ-AN
• Compatible with the optional HP-TX01 SonicLink transmitter
• Bluetooth 5.3 for wireless listening
• Bluetooth Multipoint for simultaneous connection to two devices
• Support for Google Fast Pair and Windows Swift Pair
• Built-in microphone for hands-free calling
• Newly developed 40 mm dome-type drivers
• Bass reflex chambers for controlled bass reproduction
• PEEK-PU-PEEK composite diaphragms
• Frequency response from 5 Hz to 30 kHz
• impedance of 32 ohms
• Sound pressure level of 106 dB
• Bluetooth audio codecs SBC and AAC (Bluetooth profiles A2DP, AVRCP, HSP, and HFP)
• Maximum SonicLink transmission range of approximately 15 meters without obstacles
• Maximum Bluetooth transmission range of approximately 10 meters without obstacles
• Battery life via SonicLink up to 7 hours with the status LED on
• Battery life via SonicLink: up to 9 hours with the status LED turned off
• Battery life via Bluetooth: up to 13 hours with the status LED on
• Battery life via Bluetooth: up to 25 hours with the status LED turned off
• Full charge time of approximately 2.5 hours
• Rechargeable lithium battery
• USB-C port for charging
• Adjustable headband with flexible silicone construction
• Swivel ear cups for single-ear monitoring
• Controls for volume and multifunction operation
• SonicLink and Bluetooth switch
• Battery status indicator
• Adjustable status LED
• Compatible with the AlphaTheta HEADPHONES CONNECT app
• Customizable LED colors and brightness
• Adjustable auto-off
• Support for Siri and Google Assistant
• Find My Headphones feature
• Support for firmware updates
• wired connection via included audio cable
• Included 1.2-meter coiled cable, extendable to approximately 3 meters
• Included 6.35 mm stereo jack adapter with screw-on attachment
• Weight of 285 grams without cable

The AlphaTheta HDJ-F9 comes with:

• AlphaTheta HDJ-F9 wireless DJ headphones
• 1.2-meter coiled cable, extendable to approximately 3 meters
• 6.35 mm stereo jack adapter with screw-on attachment
• 0.5-meter USB-C to USB-C charging cable
• carrying case
• Quick Start Guide
• Safety and operating instructions

OptionalThe optional DJC-F CASE carrying case and HP-TX01 SonicLink transmitter are sold separately