Promotion ended. The offer of free Hi-X55 headphones with the purchase of an OC818 Studio Set is no longer valid. We are keeping this post for historical information; the described free gift is not part of the current purchase terms.
The campaign offered free Hi-X55 headphones with the purchase of an OC818 Studio Set microphone, in its original or Black version. The announcement set the end date as June 30 and excluded demo and B-Stock units.
These terms correspond to the ended campaign and are included solely for historical reference.
OC818 Black Studio Set
The OC818 Studio Set, in its original or Black version, was the microphone included in this campaign.
Hi-X55
The Hi-X55 headphones were the free gift associated with the now-ended promotion.
View the current Austrian Audio range
If you are looking for microphones, headphones, or accessories from the brand, check the current product pages to see features, prices, and availability before purchasing.
Headphone cables are that detail no one chooses, but everyone suffers from: they get tangled in the booth, limit how far you can get from the table, and force you to keep an eye on them in the middle of a session. The new wireless DJ headphones AlphaTheta HDJ-F9, introduced on October 15, 2026, want to eliminate that hassle without sacrificing what really matters when monitoring: hearing in real time.
The key is SonicLink, AlphaTheta's proprietary wireless technology. According to the manufacturer, it offers a latency of 9 ms, enough to mix tracks and even scratch without noticing any delay.
What does SonicLink offer compared to standard Bluetooth?
Conventional Bluetooth is designed for listening to music, not for live monitoring. That is why the HDJ-F9 combine two connections:
SonicLink for DJing: low latency, high volume, and a range of up to 15 m in unobstructed spaces.
Multipoint Bluetooth 5.3 for the rest of the day: simultaneous connection to two devices (for example, a phone and a computer), with compatibility with Google Fast Pair and Windows Swift Pair.
The new feature is SonicLink Touch Pairing: you touch the mixer with the headphones and they pair. For now, the compatible equipment listed by AlphaTheta is the AlphaTheta DJM-V5, which needs its firmware updated to the latest version. To connect them to other mixers or controllers, you need the AlphaTheta HP-TX01 transmitter, which is sold separately.
Sound and isolation designed for the booth
Although they are compact, AlphaTheta has designed them for monitoring in noisy booths:
40 mm drivers with a PEEK-PU-PEEK diaphragm and a bass-reflex chamber in each housing to define bass and kicks.
Isolation that, according to the manufacturer, is high for an on-ear model, allowing you not to turn up the volume as much and reducing listening fatigue.
Silicone headband and swiveling supports for listening with one ear or wearing them around your neck, and a die-cast aluminum slider.
They also include a 1.2 m coiled cable (about 3 m extended) for wired use, a microphone for calls, and the HEADPHONES CONNECT app, which allows you to change the color of the status LED, set up automatic shut-off, or locate the headphones.
Who they make sense for (and who they don't)
They are a good fit if you DJ frequently, move around the booth, and want headphones that also work outside of it with Bluetooth. If you already have or are going to get a DJM-V5, touch pairing simplifies setup.
It is worth thinking about in these cases:
If your equipment is not compatible with Touch Pairing, you will have to add the HP-TX01 transmitter to use SonicLink.
Battery life: with SonicLink, about 7 hours with the LED on and 9 hours off (13 and 25 hours via Bluetooth). For long sessions, it is best to charge beforehand; 30 minutes of charging gives about 2.5 hours of use.
On-ear format: they rest on the ear. If you prefer headphones that completely cover it, try them before deciding.
iOS app: AlphaTheta indicates that the iPhone version will arrive later.
Frequently asked questions
Can I use the HDJ-F9 wired? Yes. They include a coiled cable with an L-shaped connector and a 6.3 mm adapter.
Do they work wirelessly with any mixer? With SonicLink, directly only with compatible equipment such as the DJM-V5. With the rest, through the HP-TX01 transmitter, which is sold separately.
I have a DJ controller, not a mixer. Are they suitable for me? Yes. Wired, they work with any equipment that has a headphone output, using the coiled cable and the 6.3 mm adapter if needed. To use them wirelessly with your controller, you need the HP-TX01 transmitter.
Can I use them with my iPhone? Yes, via Bluetooth, to listen to music or make calls. What is not yet available is the HEADPHONES CONNECT app for iOS: AlphaTheta indicates that it will arrive later, so for now, LED customization and settings are done from Android.
How much do they weigh? 285 g without the cable, according to the manufacturer.
What warranty do they have? Two years.
RØDE's historic May and June 2024 promotion, now ended: free NTH-100 headphones with the RØDECaster Pro II or Duo. Check the current product pages to buy this equipment online.
Discover Austrian Audio at microFusa: OC818 microphones, PG16 headphones, and accessories. Check specifications, prices, and availability, and buy online.
We compare eight studio headphones for recording, producing, and mixing: open, closed, and wireless options, along with their advantages and limitations to help you choose.
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