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HA543 Headphone Amplifier

SKU eq-1527

easily switch btwn flat sound + enhanced EQ curve for exciting headphone listening
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Lab Overview


  • flat sound reproduction w/ switchable EQ enhance for headphone listening
  • easily accessible front panel controls including power, mute, enhance + volumeĀ 
  • RCA +Ā XLR inputs for connecting two sources
  • separate 1/4" + 1/8" headphone outputs
  • (1) pair RCA output can be used as a pass through to other equipment
  • handĀ built in Salt Lake City, Utah

"Do you buy an amp that has a flat response or one that has some kind of sound altering circuit adding coloration to your music? The HA543 addresses and completely solves this paradox. It is as flat as flat can be unaltering the original program material keeping it as true as possible. No coloration, no gimmicks, just absolute pure reproduction of the original material, and it sounds absolutely amazing with a good pair of headphones. Then, when using the HA543ā€™s Enhance switch, coloration circuits are added changing the overall sound characteristics. The end result is an amp that makes the vocals sound more dominant, cymbals much more open and sharpens up the lower frequencies to give the bass very tight detail. Thereā€™s a lot more going on than just a simple EQ. It makes the HA543 two headphone amps in one. Want it purist flat? It's got that. Want a headphone amp that has some sound enhancing coloration? No problem." - Bellari


  • Headphone impedance: 8 Ohms to 600 Ohms
  • Input Impedance: 10K Ohms unbalanced - 20K Balanced
  • Max Input Level: +14 dBV
  • Input Connectors: RCA, XLR balanced
  • Outputs:Ā (1) 1/4" TRS Stereo jacks, (1)Ā 1/8" (3.5 mm) TRS Stereo jacks
  • Max Gain: 20 dB
  • Output Power: 326 mW/side, 652 mW/Channel (62 Ohms)
  • Frequency Response: 3 Hz - 59 kHz +/- 3 db
  • S/N Ratio: 92 dB
  • THD: <.008%
  • IMD: <.008%
  • Phase Shift (In to Out): less than 10 deg.
  • Slew Rate: 2 V per microsecond
  • Crosstalk: - 75 dB
  • Power: VDC (Power Supply Included)
  • Dimensions: 4.5 x 1.5 x 3.0" / 11.4 x 3.8 x 7.6 cm
  • Weight:Ā 1.0 lb / 0.5 kg


  • 15V power supply PN PS27s
  • owner's manual
UPC: 675889005431

Review & Q+A


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