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Marantz Pro PHA3 Portable Stereo Headphone Amplifier

Model: PHA-3

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About: Marantz Pro PHA3 Portable Stereo Headphone Amplifier

The PHA-3 Stereo Field Production Headphone Amplifier provides three independent headphone feeds from balanced or unbalanced sources, and can drive headphones to high levels at audiophile quality with low distortion—ideal for field broadcast production companies, portable audio/video production crews, and live sound productions where critical audio monitoring is required, even under high SPL conditions. The PHA3 features a rugged metal case and the ability to daisy-chain additional units utilizing the Loop outputs.


  • 3 Independent headphone outputs with individual level controls
  • Balanced XLR inputs or 1/4" and 3.5mm stereo inputs
  • 1/4" Loop output for daisy-chaining additional units in series for extra outputs
  • Parallel 3.5mm and 1/4" outputs with two additional 1/4" outputs
  • Internal power (2x AA) or external power (5-17VDC) with seamless power switchover
  • Dual-color power LED. GREEN indicates power with good battery - RED indicates low battery power (LED turns RED when (4) hours of battery life remain)
  • Rugged aluminum chassis with strap loops for wearing or mounting

Frequency Response: 10 Hz–50 kHz (± 1.0 dB)

Balanced line input

  • Loop out: -3dB
  • Headphone outputs: 34dB

Unbalanced stereo input

  • Loop out: -1dB
  • Headphone output: 35dB

Output Clipping Level

  • +18 dBu minimum with 600Ω load
  • +16 dBu minimum with 300Ω load

Input Clipping Level

  • Line input (XLR): +24dB


  • Headphone output 200Ω
  • Loop out 200Ω
  • Line input (XLR) 22 kΩ
  • Stereo/Loop in (1/4" / 6.35mm) 9.1kΩ
  • Stereo/Loop in (1/8" / 3.5mm) 9.1kΩ

Dynamic Range

  • > 120 dB

Total Harmonic Distortion (THD) +N

  • 0.03% max (10 Hz–22 kHz @ +10 dBu input/output level, 300Ω load)

Inputs / Outputs

  • (2) XLR inputs, electronically balanced
  • (1) 1/4" (6.35mm) TRS line input, unbalanced
  • (1) 1/8" (3.5mm) TRS line input, unbalanced
  • (3) 1/4" (6.35mm) TRS headphone outputs
  • (1) 1/4" (6.35mm) TRS line output , unbalanced

Internal Voltage Rails:± 15V regulated

Power Supply

  • Power adapter: 5–17 VDC, center-positive coaxial connector (5.5mm outer diameter, 2.1mm inner diameter)
  • Power adapter input voltage: 110–120 VAC, 60Hz / 220–240 VAC, 50Hz
  • Batteries: 2x AA alkaline batteries (battery life approx. 12 hrs / one set of 75Ω headphones driven, 8hrs / one set of 56Ω headphones driven

Dimensions: 3.7 x 5.6 x 1.7" (94 x 140 x 43mm)
Weight: 1.2 lbs / 0.6 kg

UPC: 0694318019474 is a Canadian authorized Marantz Pro retailer.

Reviews: Marantz Pro PHA3 Portable Stereo Headphone Amplifier

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Warranty: Marantz Pro PHA3 Portable Stereo Headphone Amplifier Warranty:

30 Days

Manufacturer's Warranty:

All Denon & Marantz Professional Rack Mountable Products are covered by a 2-year Limited Warranty

All Denon & Marantz Professional Portable Products are covered by a 1-year Limited Warranty