alm-busy-circuits-hpo

ALM Busy Circuits HPO

Super-slim 2HP stereo headphone output for Eurorack

2 HP Eurorack module

The ALM Busy Circuits HPO (ALM019) is a super-slim 2HP stereo headphone driver output for Eurorack modular synthesizers. It accepts dual audio inputs for stereo operation or a single mono input (via the L jack, which doubles to both ears), and drives standard 3.5mm headphones at comfortable listening levels with a dedicated volume control. Its tiny footprint makes it ideal for filling that last 2HP gap in a skiff or larger system, providing private monitoring without an external mixer or audio interface.

Features

  • Super-slim 2HP headphone output
  • Stereo 3.5mm headphone jack
  • Mono-to-stereo normalling on L input
  • Dedicated volume control
  • Low noise headphone amplifier
  • Skiff-friendly 38mm depth
  • Low power draw: +12V 5mA / -12V 5mA
  • No firmware or digital processing — pure analog signal path
  • Ideal for filling leftover 2HP gaps
  • Compatible with standard 16-600 ohm headphones
  • Reverse polarity protection
  • Made in England by ALM Busy Circuits

Controls & Jacks (4)

  • L (Mono) In
  • R In
  • Volume
  • Headphone Out

How-To Guides

  • Quick Mono Monitor
  • Stereo Monitoring
  • A/B Sound Comparison
  • Silent Live Practice

Explore the interactive HPO panel on BleepDex — tap any control to learn what it does.

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