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AlphaTheta HDJ-F9 are on-ear wireless DJ headphones with SonicLink monitoring as low as 9 ms and multipoint Bluetooth 5.3. They pair by touch with SonicLink gear such as the DJM-V5, use a 40 mm PEEK-PU-PEEK driver, swivel for one-ear monitoring, and run up to 9 hours on SonicLink and 25 on Bluetooth.
On-ear SonicLink headphones that pair with a touch.
The HDJ-F9 bring SonicLink to an on-ear design. Latency is as low as 9 ms, against roughly 200 to 300 ms for Bluetooth with standard codecs by AlphaTheta's figure. SonicLink Touch Pairing connects them by touching the headphones to compatible gear such as the DJM-V5 on current firmware, and the HP-TX01 transmitter, sold separately, connects them to any other mixer.
A newly developed 40 mm driver with a PEEK-PU-PEEK composite diaphragm sits in a housing with a bass-reflex chamber at the top. The swivel mechanism and flexible silicone headband allow one-ear, two-ear or on-shoulder monitoring, the slider is die-cast aluminum, and a bayonet lock keeps the 1.2 m coiled cable from pulling out when used wired.
Bluetooth 5.3 is multipoint, connected to two devices at once, with Google Fast Pair and Windows Swift Pair. A customizable status LED and Find My Headphones run through the HEADPHONES CONNECT app. Battery runs about 9 hours on SonicLink and 25 on Bluetooth with the LED off, and a 30-minute charge gives about 2.5 hours of SonicLink.
At a Glance
| Type | On-ear wireless DJ headphones |
| SonicLink latency | As low as 9 ms |
| Pairing | Touch Pairing with DJM-V5, or HP-TX01 |
| Bluetooth | 5.3 multipoint, two devices |
| Battery | About 9 hours SonicLink, 25 hours Bluetooth, LED off |
| Driver | 40 mm, PEEK-PU-PEEK |
| Weight | 285 g |
| Warranty | Full AlphaTheta manufacturer warranty. Call 844-687-4208 for the current term |
How Do the HDJ-F9 Connect to a Mixer?
By SonicLink Touch Pairing with compatible gear such as the DJM-V5, by the HP-TX01 transmitter on any mixer with a PHONE or 3.5 mm output, or wired with the included coiled cable.
Who Are the HDJ-F9 For?
DJs who prefer on-ear headphones for one-ear monitoring, DJs on the DJM-V5 who want touch pairing, and anyone who wants wireless booth monitoring with long Bluetooth battery life for everyday use.
How Are They Different From the HDJ-F10?
The HDJ-F9 are on-ear, pair by touch with the DJM-V5, and have multipoint Bluetooth 5.3. AlphaTheta does not list noise cancelling for the HDJ-F9, and spare earpads are not included.
What Comes in the Box?
- 1.2 m coiled cable, about 3.0 m extended
- 6.3 mm screw-on stereo adapter
- USB Type-C charging cable, 0.5 m
- Carrying pouch
- Quick Start Guide
- Precautions for Use
Connections
| Wireless | SonicLink and multipoint Bluetooth 5.3 |
| Wired | 3.5 mm plug, bayonet-locking cable |
| Charging | USB Type-C |
| NFC | For SonicLink Touch Pairing |
Specifications
| Type | Closed, dynamic, on-ear |
| Driver | 40 mm dome, PEEK-PU-PEEK composite diaphragm |
| Frequency response | 5 Hz to 30 kHz |
| Impedance | 32 ohms |
| Sensitivity | 106 dB |
| SonicLink latency | As low as 9 ms |
| SonicLink range | About 15 m unobstructed |
| Bluetooth | 5.3, SBC and AAC, about 10 m |
| SonicLink playback | About 9 hours LED off, 7 hours LED on |
| Bluetooth playback | About 25 hours LED off, 13 hours LED on |
| Charge time | About 2.5 hours |
| Weight | 285 g without cable |
Why AlphaTheta?
AlphaTheta is the parent company behind Pioneer DJ, and it also releases products under its own name. The engineering and the rekordbox ecosystem are shared, so AlphaTheta gear integrates with a Pioneer DJ setup rather than sitting alongside it.
Frequently Asked Questions
Is this a genuine AlphaTheta product?
Yes. Victory is a veteran owned dealer in Miami and units ship new in original packaging with full manufacturer support.
Is a transmitter included with the HDJ-F9?
No. They pair directly with SonicLink gear such as the DJM-V5. For other mixers, use the HP-TX01 transmitter, sold separately.
Can they connect to two Bluetooth devices?
Yes. Bluetooth 5.3 is multipoint, so they stay connected to two devices at once.