Headphone Gizmo

The Headphone Gizmo is a broadcast-grade headphone amplifier for radio and podcast studios. It accepts balanced stereo audio via RJ45 (StudioHub+ format) and delivers 1.4W per channel into 16Ω loads. Mounts to the underside of a desk or countertop. A daisy-chain RJ45 output passes audio and power to the next device, supporting multiple positions from a single input.

• Drives high and low impedance headphones equally well — no compromises
• Both 1/4″ (6.3mm) and 1/8″ (3.5mm) headphone jacks (mutually exclusive)
• Mounts to the underside of a desk or countertop surface
• Daisy-chain RJ45 output for feeding multiple Gizmos or other StudioHub+ devices
• Available with local volume control (991030) or fixed gain
• Powered by included wall adapter or StudioHub+ power inserter via RJ45
• Powder-coated steel enclosure, no exposed circuit boards
• RFI-immune circuitry
• Engineered and assembled in Nashville, USA

• Audio Input / Daisy-Chain Output: RJ45, StudioHub+ format
• Headphone Output: 1/8″ (3.5mm) and 1/4″ (6.3mm) TRS (mutually exclusive)
• Power: 16VAC via wall adapter, or +/-15VDC via RJ45 audio input jack

• Nominal Input Level: +4dBu
• Maximum Input Level: +24dBu
• Input Impedance: 20kΩ fully balanced
• Minimum Headphone Impedance: ≥16Ω
• Output Voltage: +20dBu
• Output Power: 1.4W per channel at 16Ω
• Output Current: 300mA RMS
• Frequency Response: 20Hz – 20kHz ±0.3dB
• THD+N: ≤0.005% (20Hz – 20kHz)
• Noise: ≤-96dBu (20Hz – 20kHz unweighted)
• Dynamic Range: ≥115dB
• CMRR: ≥80dB (1kHz)

• Wall Adapter (NA): 120VAC 60Hz input, 16VAC 500mA 8.0W output
• Wall Adapter (EU, UK, AUS): 230VAC 50Hz input, 16VAC 500mA 8.0W output
• Operating Temperature: 0° to 40°C (32° to 104°F)
• Storage Temperature: -20° to 45°C (-4° to 113°F)
• Relative Humidity: 0% to 90% non-condensing

• 991030 — Headphone Gizmo, 115VAC NA power plug
• 991030E — Headphone Gizmo, 230VAC Europe power plug
• 991030A — Headphone Gizmo, 230VAC Australia power plug
• 991030U — Headphone Gizmo, 230VAC UK power plug
• 991030X — Headphone Gizmo, 115VAC NA power plug, no volume control
• 991030XE — Headphone Gizmo, 230VAC Europe power plug, no volume control
• 991030XA — Headphone Gizmo, 230VAC Australia power plug, no volume control
• 991030XU — Headphone Gizmo, 230VAC UK power plug, no volume control
• 991030D — Headphone Gizmo, power supply deleted
• 991030XD — Headphone Gizmo, no power supply, power supply deleted

• Product Dimensions: 5.6″ x 4.0″ x 1.4″
• Shipping Dimensions: 8.0″ x 6.0″ x 3.0″
• Shipping Weight: 3.0 lbs

• Headphone Gizmo
• Wall adapter power transformer

Full Callouts

• On-air broadcast studio headphone feed
• Podcast studio talent monitoring
• Guest position headphone drive via daisy-chain
• Any installation requiring high-power headphone amplification

The Headphone Gizmo uses the StudioHub+ RJ45 pinout for both audio and power. Adapters are available for XLR, TRS, and other common connector types. A daisy-chain output passes the full input signal and power to the next device in line, allowing multiple Gizmos to be fed from a single node or blade output.

• Guest Gizmo — desktop-mount headphone amp with cough button, tally driver, and mic muting via insert jack. Installs in a 2-3/4″ grommet hole.
• Mic Stand Gizmo — headphone amp, mic controls, tally driver, and magnetic disconnector built into the base of a M!KA mic arm.
• Mic Drop Gizmo — mic-arm-mount cough/mute button. Installs between the mic and preamp, passes phantom power, silent muting, reversible to push-to-talk.

• Product page
• User guide
• Assembled in USA, HTS Code 8518402000
• Support: angryaudio.com/contact | answers@angryaudio.com | +1 (615) 763-3033