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Marantz Professional PHA-3
  • Marantz Professional PHA-3 | Stereo Field Production Headphone Amplifier with XLR, 1/4" & 1/8" Headphone Outputs | Rugged Aluminum Chassis | Switchable Stereo or Mono Operation
  • Marantz Professional PHA-3 | Stereo Field Production Headphone Amplifier with XLR, 1/4" & 1/8" Headphone Outputs | Rugged Aluminum Chassis | Switchable Stereo or Mono Operation
  • Marantz Professional PHA-3 | Stereo Field Production Headphone Amplifier with XLR, 1/4" & 1/8" Headphone Outputs | Rugged Aluminum Chassis | Switchable Stereo or Mono Operation
  • Marantz Professional PHA-3 | Stereo Field Production Headphone Amplifier with XLR, 1/4" & 1/8" Headphone Outputs | Rugged Aluminum Chassis | Switchable Stereo or Mono Operation

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Item Code: PAMZP00019 Part Number: PHA3XUS

Marantz Professional PHA-3
Stereo Field Production Headphone Amplifier with XLR, 1/4" & 1/8" Headphone Outputs
Rugged Aluminum Chassis
Switchable Stereo or Mono Operation

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The PHA-3 Portable Stereo Headphone Amplifier from Marantz is a field production amplifier that provides three independent headphone feeds from balanced or unbalanced sources. It can be used to drive headphones to high levels with low distortion and is ideal for field broadcast production, portable audio/video production crews, and live sound applications.


Featuring balanced XLR, 1/4", and 1/8" stereo inputs, the amplifier delivers critical audio monitoring even under high SPL conditions. There is a dual-color power LED with a low-battery power indicator. It is built with a rugged metal case and the ability to daisy-chain additional units utilizing the loop outputs. It can run on two AA batteries or the included external power supply.


  • - Three independent headphone outputs with individual level controls

  • - Balanced XLR inputs or 1/4" and 1/8" stereo inputs

  • - 1/4" loop output for daisy-chaining additional units in series for extra outputs

  • - Parallel 1/8" and 1/4" outputs with two additional 1/4" outputs

  • - Internal power (2x AA) or external power (5-17 VDC) 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 to 50 kHz ± 1.0 dB
Balanced Line Output Loop Out: -3 dB, Headphone Output: 34 dB
Headphone Output Loop Out: -1 dB, Headphone Output: 35 dB
Clipping Level Headphone/Loop Output (1/4” / 6.35 mm), Line Input (XLR) +24 dBu
Impedance Headphone Output 200 O, Loop Out 200 O, Line Input (XLR) 22 KO, Stereo/Loop In (1/4” / 6.35 mm) 9.1 KO, Stereo/Loop In (1/8” / 3.5 mm) 9.1 KO
Dynamic Range > 120 dB (balanced line inputs)
THD+N 0.03% maximum (10 Hz – 22 kHz @ +10 dBu input/output level, 300 O load, 10 Hz – 22,000 Hz filter bandwidth)
Inputs/Outputs 3 x 1/4” TRS headphone outputs
Internal Voltage Rails 15 V, regulated
Power Adapter 5–17 V DC, coaxial connector (5.5 mm outer diameter, 2.1 mm inner diameter), center-positive
Batteries 2x AA alkaline batteries (approximately 12 hours of life driving 1 set of 75 O headphones, 8 hours of life driving 1 set of 56 O headphones)
Input Voltage 110-120 V AC, 60 Hz; 220-240 V AC, 50 Hz
Dimensions 3.7 x 5.6 x 1.7” (9.4 x 14.22 x 4.32 cm)
Weight 1.2 lbs. (0.54 kg)
Return & Exchange 14 Days
Manufacturer Warranty 1 Year Manufacturer
Manufacturing Defect Exchange 30 Days Defective Exchange Only
Courtesy Warranty Repair Shipment Service 90 Days Courtesy MFG Warranty Repair Services
Charged Warranty Repair Shipment Service 1 Year Charge MFG Warranty Repair Services
Sales Condition Unopened items, in their original packaging must be returned or exchanged "as new" condition in 14 days. Defective products can be exchanged in 30 days for same model only. Store credits will be issued for EOL defective items.