Superlux HA3D Headphone Amplifier



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Superlux HA3D Battery Powered Headphone Amp

The HA3D is a portable, stereo headphone amplifier designed for demanding and critical audio monitoring. This audiophile quality headphone amp is ideal for adding headphone feeds for portable, studio, and audio enthusiast applications.

The HA3D provides 3 independent headphone feeds from balanced or unbalanced line sources. Each headphone output is controlled by the associated level control, equipped with independent peak LED, and 1/4-inch output connector. With its extended bandwidth and high current/voltage drive capability the HA3D can drive headphones of various impedances to high levels with very low distortion, important for monitoring in high SPL environments. It can be powered from two-AA batteries or external DC.

The HA3D will provide years of superb audio performance under the most demanding field conditions.


  • 3 independent headphone outputs with individual volume controls.
  • Frequency response from 10 Hz to 50 kHz.
  • ≥120dB dynamic range.
  • High power driving capability, drives headphones to high levels with very low distortion.
  • Individual peak indicators show overload of each headphone feed.
  • Master Stereo / Mono switch.

Dual Power
  • Internal battery power (2 x AA) for convenient, low cost power.
  • Long battery life - more than 10 hours (Alkaline batteries, @ nominal drive level).
  • External 5-17VDC powering.

Flexible Inputs / outputs
  • 2 balanced XLR line level inputs or unbalanced 1/4-inch and 1/8-inch stereo inputs
  • Loop output to connect additional HA3D’s in series for extra headphone outputs.

Durable Mechanical construction
  • High strength aluminum chassis withstands challenging field conditions.
  • Strap loops on side panels for easy mounting or wearing.
  • Panel-mounted connectors for strength and reliability.
  • Easy access battery compartment for quick battery changes.


  • Frequency Response: 10Hz-50 kHz,+/-1.0dB, any input to any output, gain control set to 50%
  • Voltage Gain: (Gain,Loop,Out Headphone output) Bal. Line,-3dB,34dB;HP Input, -1dB, 35dB
  • Output Clipping Level: +18dBu minimum with 600 ohm load ;+16dBu minimum with 300 ohm load
  • Headphone Output impedance: 200 ohms
  • Input Clipping Level: XLR:+24 dBu
  • Dynamic Range: ≥120 dB (Balanced line inputs)
  • THD + Noise: 0.03% maximum(from 10Hz – 22kHz @ +10 dBu input and output level, 300 ohm load,10 Hz – 22kHz filter bandwidth)
  • Inputs: XLR-electronically balanced, 22k ohm input impedance; 1/4-inch unbalanced-9.1k ohm impedance; 1/8-inch unbalanced-9.1k ohm impedance ;Note: only one set of inputs (balanced or unbalanced) should be connected at a time
  • Loop Output: Unbalanced, 200 ohm output impedance
  • Internal Voltage Rails: ±15V, regulated
  • Power: Internal: 2 AA alkaline batteries, 12 hours life typical driving one 75 ohm headset; External: 5-17 VDC via threaded coaxial connector,(5.5mm outer diameter, 2.1 mm inner diameter), pin positive, sleeve negative. Voltages above 17 VDC cause no damage to unit, but will open an internal poly fuse. Poly fuse will reset when voltage is removed.
  • Power LED: Green indicates power and good battery.Red indicates power with low batteries. LED turns red when approximately 4 hours of battery life remain
  • Operating Temperature Range: 0 to 70°C 32 to 160°F
  • Dimensions: 43 mm×94mm×140mm (h×w×d) (1.7” ×3.7” ×5.55”)
  • Weight: (unit only) 0.56 kg, 1.24 lbs


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