AlphaTheta HDJ-F9
(AlphaTheta HDJF9)
Wireless DJ Headphones with Ultralow-Latency Monitoring
The AlphaTheta HDJ-F9 professional wireless DJ headphones combine SonicLink ultralow-latency technology, Bluetooth 5.3 connectivity, and newly developed 40mm dynamic drivers for accurate monitoring and everyday music listening. With wireless latency as low as 9ms through SonicLink, these closed-back on-ear headphones allow DJs to beatmatch, mix, and scratch without a traditional headphone cable. Their bass-reflex chambers, sound-isolating construction, flexible headband, and durable aluminum components provide detailed audio reproduction and comfortable operation in demanding DJ environments.
AlphaTheta HDJ-F9 Competitive Differences
- 9ms SonicLink Wireless Monitoring: AlphaTheta's proprietary ultralow-latency technology provides responsive wireless audio for accurate DJ mixing and scratching.
- SonicLink Touch Pairing: Connect directly with compatible DJ equipment through touch pairing, or use the separately available HP-TX01 transmitter with equipment lacking built-in SonicLink support.
- Newly Developed 40mm Drivers: Dynamic drivers with PEEK-PU-PEEK composite diaphragms deliver rich bass, detailed midrange, and balanced high-frequency reproduction.
- Bass-Reflex Chamber Design: Integrated air chambers improve low-frequency response for clearly defined kick drums and basslines.
- Effective Passive Sound Isolation: Optimized housing and earpad construction reduces external noise for precise monitoring in loud DJ booths.
- Bluetooth 5.3 Multipoint Connectivity: Connect to two Bluetooth devices simultaneously for convenient switching between a smartphone, computer, or other compatible sources.
- Extended Wireless Battery Life: Provides up to 9 hours of SonicLink playback or 25 hours of Bluetooth playback with the Status LED turned off.
- Customizable Status LED: The HEADPHONES CONNECT app allows adjustment of LED color and brightness, headphone settings, and firmware updates.
- Flexible DJ Monitoring Design: Swivel-mounted hangers and a flexible silicone headband support single-ear monitoring and over-the-shoulder positioning.
- Durable Aluminum Construction: Die-cast aluminum adjustable sliders and a secure locking cable connection provide durability during regular DJ use.
AlphaTheta HDJ-F9 Description
The AlphaTheta HDJ-F9 brings wireless freedom to professional DJ monitoring without sacrificing the responsiveness needed for live mixing. Equipped with AlphaTheta's SonicLink wireless technology, the headphones achieve latency as low as 9 milliseconds, allowing DJs to monitor tracks and perform precise beatmatching without the delay commonly associated with conventional Bluetooth audio. SonicLink Touch Pairing enables convenient connection with compatible DJ equipment, while the separately available HP-TX01 transmitter extends SonicLink functionality to audio equipment without integrated support.
Audio performance is driven by newly developed 40mm dynamic drivers with PEEK-PU-PEEK composite film diaphragms. This design reduces unwanted diaphragm vibration while maintaining detailed midrange and high-frequency reproduction. Built-in bass-reflex chambers enhance low-frequency response, helping DJs clearly identify kick drum transients and basslines during performances. With a frequency response of 5 Hz to 30 kHz, 32-ohm impedance, and 106dB sensitivity, the headphones provide powerful, detailed sound for monitoring, music preparation, and everyday listening.
Designed for demanding DJ environments, the HDJ-F9 features optimized closed-back housings and earpads that provide effective passive sound isolation. The on-ear design helps reduce interference from surrounding sound systems, allowing more comfortable monitoring in noisy venues. Swivel-mounted hangers support flexible listening positions, while the silicone headband and durable die-cast aluminum sliders provide comfortable handling and dependable construction. A secure bayonet-style locking connection helps prevent accidental disconnection when using the included coiled audio cable.
For everyday wireless listening, Bluetooth 5.3 connectivity supports AAC and SBC audio codecs, multipoint pairing with two devices, Google Fast Pair, and Windows Swift Pair. The built-in microphone enables hands-free calls, while the dedicated HEADPHONES CONNECT app allows users to customize the Status LED, manage automatic power-off settings, configure voice assistant controls, and access headphone-finding functions. The app also provides firmware updates and additional device settings.
The rechargeable battery provides approximately 7 hours of SonicLink operation or 13 hours of Bluetooth playback with the Status LED illuminated. Turning the LED off extends the specified operating time to approximately 9 hours with SonicLink or 25 hours with Bluetooth. A full charge takes approximately 2.5 hours, while a 30-minute quick charge provides about 2.5 hours of SonicLink playback. The included 1.2-meter coiled audio cable extends to approximately 3 meters for wired monitoring, making the HDJ-F9 suitable for professional DJ booths, mobile performances, studio sessions, and personal listening.
HDJ-F9 Features
- Professional closed-back on-ear wireless DJ headphones
- AlphaTheta SonicLink ultralow-latency wireless technology
- Wireless monitoring latency as low as 9ms
- SonicLink Touch Pairing with compatible DJ equipment
- Compatible with separately available HP-TX01 SonicLink transmitter
- Bluetooth 5.3 wireless connectivity
- Bluetooth multipoint connection for two devices simultaneously
- AAC and SBC Bluetooth audio codec support
- Google Fast Pair and Windows Swift Pair compatibility
- Newly developed 40mm dynamic headphone drivers
- PEEK-PU-PEEK composite film diaphragms
- Integrated bass-reflex chambers for enhanced low-frequency reproduction
- Wide 5 Hz - 30 kHz frequency response
- Optimized housing design for effective passive sound isolation
- Closed-back stereo headphone construction
- Flexible silicone headband for comfortable monitoring
- Swivel-mounted hangers for single-ear and dual-ear listening
- Durable die-cast aluminum adjustable sliders
- Bayonet-style locking audio cable connection
- Customizable Status LED color and brightness
- HEADPHONES CONNECT app for device settings and firmware updates
- Find My Headphones function through the companion app
- Built-in omnidirectional microphone for hands-free calls
- Voice assistant control configuration
- Up to 9 hours of SonicLink battery life with Status LED off
- Up to 25 hours of Bluetooth battery life with Status LED off
- Approximately 2.5-hour full charging time
- 30-minute quick charge provides approximately 2.5 hours of SonicLink playback
- USB-C rechargeable battery
- Detachable 1.2-meter coiled audio cable extending to approximately 3 meters
- Secure wired monitoring option for DJ equipment
- Black finish with minimalist styling
- Lightweight 10.1 oz (285 g) construction without cable
HDJ-F9 Specifications
- Product Type: Professional Wireless DJ Headphones
- Model: HDJ-F9
- Color: Black
- Headphone Design: Closed-Back, On-Ear
- Driver Type: Dynamic
- Driver Size: 1.57 in (40 mm)
- Driver Diaphragm: PEEK-PU-PEEK Composite Film
- Frequency Response: 5 Hz - 30 kHz
- Impedance: 32 Ohms
- Sensitivity: 106dB
- Sound Field: Stereo
- Acoustic Design: Bass-Reflex Chamber
- Noise Isolation: Passive Sound Isolation
- Wireless Technologies: SonicLink and Bluetooth
- SonicLink Latency: As Low As 9ms
- SonicLink Frequency Band: 2.4 GHz
- SonicLink Maximum Range: Approximately 49.2 ft (15 m), Unobstructed
- SonicLink Pairing: Touch Pairing with Compatible Devices
- Optional SonicLink Transmitter: HP-TX01 (Sold Separately)
- Bluetooth Version: 5.3
- Bluetooth Frequency Band: 2.4 GHz
- Bluetooth Maximum Range: Approximately 32.8 ft (10 m), Unobstructed
- Bluetooth Codecs: SBC, AAC
- Bluetooth Profiles: A2DP, AVRCP, HSP, HFP
- Bluetooth Multipoint: Two Simultaneously Connected Devices
- Quick Pairing: Google Fast Pair, Windows Swift Pair
- Built-In Microphone: Yes
- Microphone Type: Electret Condenser
- Microphone Pickup Pattern: Omnidirectional
- Microphone Frequency Response: 100 Hz - 4 kHz
- Audio Connector: 1/8 in (3.5 mm) Stereo Mini Plug
- Included Audio Adapter: 1/4 in (6.35 mm) Stereo Screw-Type Adapter
- Audio Cable: 3.9 ft (1.2 m) Coiled, Extends to Approximately 9.8 ft (3 m)
- Cable Connection: Bayonet Locking Mechanism
- Mobile App: HEADPHONES CONNECT
- App Functions: LED Customization, Device Settings, Headphone Finder, Firmware Updates
- Battery Type: Built-In Rechargeable Lithium Polymer
- Battery Voltage: DC 3.7V
- Charging Input: DC 5V via USB-C
- SonicLink Battery Life (LED On): Approximately 7 Hours
- SonicLink Battery Life (LED Off): Approximately 9 Hours
- Bluetooth Battery Life (LED On): Approximately 13 Hours
- Bluetooth Battery Life (LED Off): Approximately 25 Hours
- Full Charging Time: Approximately 2.5 Hours
- Quick Charge: 30 Minutes for Approximately 2.5 Hours of SonicLink Playback
- Recommended Charging Temperature: 50°F - 95°F (10°C - 35°C)
- Operating Temperature: 32°F - 104°F (0°C - 40°C)
- Operating Humidity: 35% - 80% RH, Non-Condensing
- Headband Cushion: Silicone
- Earpad Material: Polyurethane, Leather-Style Finish
- Slider Construction: Die-Cast Aluminum
- Weight: 10.1 oz (285 g), Without Cable
What's In The Box
- AlphaTheta HDJ-F9 Wireless DJ Headphones
- 3.9 ft (1.2 m) Coiled Audio Cable, Extendable to Approximately 9.8 ft (3 m)
- 1/4 in (6.35 mm) Stereo Screw-Type Plug Adapter
- USB-C to USB-C Charging Cable, 1.6 ft (0.5 m)
- Carrying Pouch
- Quick Start Guide
- Precautions for Use Documentation
