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DJ Tech Reviews

AlphaTheta HDJ-F9

Lighter on-ear SonicLink headphones with no noticeable delay; pricey with the transmitter, no noise cancelling.

AlphaTheta HDJ-F9 headphones at an angle

Photos: AlphaTheta Corporation

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Only 2 professional reviews so far, 2 recommending it

See reviews

An early read

This page rests on 2 professional reviews and no owner reviews, too few to be sure. It is recompiled as more reviews appear.

Best for
DJs whose mixer or all-in-one already has SonicLink built in.
Skip it if
You want noise cancelling, over-ear cups, or wireless without buying a transmitter.

The Internet’s Opinion

From 2 professional reviews: not much evidence yet.

Both professional reviews found recommend it, for SonicLink monitoring with no noticeable delay, good sound, and Bluetooth plus a cable for everything else. The reservations are the price, higher with the separate transmitter, and a SonicLink battery that cannot be topped up while in use; no owner reviews were found yet.

2 recommend0 mixed0 avoid

What people praise

  • SonicLink latency goes unnoticed while mixing
  • Bluetooth for everyday listening and a cable for passive wired use
  • Good sound for DJ monitoring

What to know first

  • Expensive, more so with the separate HP-TX01 transmitter for gear without SonicLink
  • Will not charge while switched on, so no topping up mid-set
  • Seven to nine hours on SonicLink may not cover a long rehearsal and set
See the 2 reviews behind this

2 professional reviews (2 recommend, 0 mixed, 0 avoid); 0 owner reviews read: Guitar Center lists the headphones with no reviews yet, and Thomann does not list the productCompiled 2026-11-09How this is compiled

Video reviews

  • Digital DJ TipsOct 2026

    AlphaTheta HDJ-F9 Review: On-Ear SonicLink Headphones Tested

    AlphaTheta HDJ-F9 Review: On-Ear SonicLink Headphones Tested

    Digital DJ TipsOct 2026

Plays from YouTube when you press play. Picked from the reviews counted above, including one that disagrees where there is one.

Prices

Before you buy

Released
October 2026
Status
Current

Works with

  • AlphaTheta DJM-V5Touch pairing

    The DJM-V5 mixer has a built-in SonicLink transmitter and pairs by a button press or by touching the headphones to it; touch pairing needs the latest DJM-V5 firmware Manufacturer spec sheet (AlphaTheta), checked 2026-11-09

  • AlphaTheta XDJ-AZBuilt-in SonicLink

    The XDJ-AZ has an integrated SonicLink transmitter and pairs with SonicLink headphones at the press of a button Manufacturer spec sheet (AlphaTheta), checked 2026-11-09

  • AlphaTheta XDJ-ANBuilt-in SonicLink

    The XDJ-AN has SonicLink built in for compatible headphones, with a range of about 5 m unobstructed on that unit Manufacturer spec sheet (AlphaTheta), checked 2026-11-09

  • Any DJ mixer, via the HP-TX01Transmitter needed

    The HP-TX01 transmitter, sold separately, plugs into the headphone jack of a DJ device with its supplied straight cable and sends SonicLink audio to the HDJ-F9 User manual (AlphaTheta (HDJ-F9 manual)), checked 2026-11-09

  • Phones and computers over BluetoothBluetooth 5.3

    SBC and AAC codecs, multipoint for two devices at once, Google Fast Pair and Windows Swift Pair, and a microphone for phone calls; AlphaTheta gives Bluetooth latency as about 200 to 300 ms Manufacturer spec sheet (AlphaTheta), checked 2026-11-09

  • Wired useCable included

    The headphones play through the supplied coiled cable without power; they do not switch on while a cable is connected. Cables from the HDJ-CX, HDJ-S7 and HDJ-F10 fit the same plug User manual (AlphaTheta (HDJ-F9 manual)), checked 2026-11-09

You’ll also need

  • HP-TX01 transmitterNot in the box

    The box has no transmitter; SonicLink with a mixer or player that lacks it built in needs the HP-TX01, sold separately User manual (AlphaTheta (HDJ-F9 manual)), checked 2026-11-09

  • USB power adapterNot in the box

    The headphones charge over the supplied USB-C cable from a 5 V USB power adapter of at least 1.5 A, sold separately User manual (AlphaTheta (HDJ-F9 manual)), checked 2026-11-09

Key specs

Type
Closed, dynamic, on-ear
Weight
285 g (10.06 oz), without cable
Impedance
32 Ω
Cable
1.2 m coiled (approx. 3.0 m extended) with L-shaped plug and bayonet lock
Plug
3.5 mm stereo mini plug; threaded 6.3 mm adapter included
Connection
SonicLink (built-in transmitter, touch pairing or HP-TX01), Bluetooth 5.3 (SBC, AAC), or cable
All 14 specifications
Battery life
Approx. 9 h on SonicLink, 25 h on Bluetooth with the status LED off; 7 h and 13 h with it lit
Frequency response
5 Hz – 30 kHz
Driver
40 mm dome type, PEEK-PU-PEEK composite diaphragm
Sensitivity
106 dB
SonicLink latency
9 ms (manufacturer figure); approx. 200–300 ms on Bluetooth with standard codecs
Range
Approx. 15 m SonicLink, 10 m Bluetooth (unobstructed)
Noise cancelling
None listed; passive isolation only
Charging
USB-C, approx. 2.5 h; 30 min gives approx. 2.5 h; switches off while charging

14 of 14 figures sourced; hover one for its source

Our take

Rory TassellWritten from the sources on this page, not from a loan unit.

Both professional reviews found recommend it: SonicLink monitoring with no noticeable delay, good sound, and Bluetooth plus a cable for everything else. The shared reservations are the price, higher with the separate transmitter, and a battery that cannot charge while switched on. No owner reviews were found yet, so the evidence is thin. Buy it if your mixer or all-in-one has SonicLink built in; otherwise budget for the HP-TX01.

What it is

Status, November 2026: current. AlphaTheta announced the HDJ-F9 on 15 October 2026 and lists it today.

What it is

The HDJ-F9 is a closed, on-ear wireless DJ headphone from AlphaTheta, an on-ear sibling of the over-ear HDJ-F10. It connects three ways: SonicLink, AlphaTheta's own low-latency link, with a claimed 9 ms delay; Bluetooth 5.3 (SBC and AAC, two devices at once) for phones and computers, where AlphaTheta puts the delay at 200 to 300 ms; and a 1.2 m coiled cable for passive wired use, which also works when the battery is flat.

SonicLink is built into the DJM-V5 mixer and the XDJ-AZ and XDJ-AN all-in-ones. New on the HDJ-F9 is touch pairing: touch the ear cup to a DJM-V5, after a firmware update, to connect. Other mixers need the HP-TX01 transmitter, sold separately, in their headphone socket.

Against the HDJ-F10 it weighs 285 g rather than 356 g and has no active noise cancelling. Its battery runs about 9 hours on SonicLink and 25 on Bluetooth with the status light off, or 7 and 13 with it lit, where the HDJ-F10 is rated at 9 and 30, and the HDJ-F10 cannot use touch pairing. The box holds the coiled cable, a threaded 6.3 mm adapter, a USB-C charging cable and a pouch, with no spare ear pads. Digital DJ Tips found they sound tinny unless pulled down onto the ears, and that they will not charge while switched on.

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