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HeadRoom Portable Micro Amp

MSRP $399.00
This product is no longer available for purchase.

It's like putting a little audiophile listening room in your briefcase. Built like a tank to endure the rigors of the road and replete with dual-cell rechargeable lithium batteries and a killer headphone amp circuit, the HeadRoom Portable Micro Amp delivers an amazing listening experience anywhere in, or above, the world.

Features include our famous HeadRoom crossfeed for improved headphone imaging, 3-position gain control to precisely match any headphone impedance, plus a rear panel volume-controlled output for your self-powered computer/bookshelf speakers. The optional (+$150) built-in digital to analog converter [DAC] stage adds audiophile USB, optical and coaxial digital hi-rez S/PDIF inputs. Made in Montana USA.

PORTABLE MICRO AMP OPTIONS (choose DAC option via drop-down box at right) 

~With NO DAC [analog line-input only] - $399
~With DAC [adds USB, mini coax, and mini optical digital inputs] -  $549

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Product Features:

  • Experience audiophile listening with your favorite headphones anywhere
  • Minimum 12~15 hour battery time before recharging required
  • Better headphone imaging ability with HeadRoom crossfeed circuitry
  • 3-position gain switch optimizes for any headphone between 16 Ohms to 600 Ohms
  • Includes volume-controlled pre-amp output for powered computer/desktop speakers
  • Optional internal DAC allows direct USB feed from any computer plus optical or coaxial S/PDIF 'hi-rez' connections
  • Free 2-year 'repair or replace' product warranty
  • Engineered & manufactured in Montana USA

What's In The Box:

  • Plug-in [AC] lithium battery recharger adapter
  • HeadRoom owner's manual


What if you could take your audiophile listening room with you? At HeadRoom, we've been asking -- and answering -- this question for a full two decades now. Our latest riposte: the HeadRoom Portable Micro Headphone Amp. This little dusky gem is a very deliberate blend of audiophile quality parts, a road-worthy extruded black aluminum + urethane enclosure, a serious lithium battery/recharging circuit, plus a painstakingly well-conceived DAC digital-input option, all tightly focused on getting you great access to your tunes whether they live on an iPod, iPad, laptop, mp3 player or any other type of portable audio device you may use.

Your player and the HeadRoom Portable Micro Headphone Amp in its standard 'no-DAC' configuration creates an outstanding personal analog audio system that provides hours of high-end portable listening pleasure wherever you may roam. Add the optional internal Digital to Analog Converter (DAC; $150 extra) and the Portable Micro can accept optical and coaxial S/PDIF digital inputs, or direct USB connection from any compute or an Apple iPad (with Apple 'Camera Kit' accessory). You'll be amazed at how good your laptop, MAC, iPad or PC can sound when the audio digital-to-analog conversion process is done properly, and outside the noisy electrical environment ever-present inside the player's own hard-drive.


The front panel of the HeadRoom Portable Micro Amp sports (left to right) line input and headphone output 1/8" (3.5mm) mini-jacks, HeadRoom Crossfeed switch and gain switches, volume control, and power switch. The rear panel has the power input jack, charge state indicator LED, and pre-amp output jack in it's standard configuration; the DAC option adds the 3.5mm mini-optical/coaxial digital input jack and a USB 'mini-B' connector.

How it Works

The Portable Micro Amp/DAC couldn't be easier to use, simply plug in a source and headphones, and turn it on. The battery is a two-cell, 7.4VDC, 2550mAh Lithium-Ion rechargeable which runs for about 12-15 hours, and recharges in about 3 hours. The battery is specified to deliver greater than 85% of its rated capacity for greater than 300 charge cycles, and is fully warranteed for two (2) years. The unit must be returned to HeadRoom for eventual lithium battery replacement. The Portable Micro Amp is meant for mobile listening use so the provided 'power supply' accessory is purely a lithium battery recharging adapter, and NOT a true AC-power supply! For maximized battery lifespan, do not leave the Micro Portable unit "plugged-in" during listening or when not actively charging the battery.

For the optional DAC stage, the Portable Micro with DAC unit uses the superb Texas Instruments TI PCM1793 chip-set, lovingly reprogrammed, tweaked and hot-rodded by our HeadRoom audio engineers.


The HeadRoom Micro Amp case is a custom-manufactured heavy aluminum extrusion and all markings are laser-etched into the jet black anodized finish --- in other words, you could run over this baby with a car and it wouldn't even chip the paint [umm, not recommended! -ed.]. The urethane bezel (that rubber surrounding the front & rear amp panels) provides significant protection for the entire enclosure and non-skid security while on your desktop. The bezel has a foot sweep that fits into the groove in the top of the bezel, thus allowing all HeadRoom Micro products to stack conveniently and securely.

All HeadRoom Portable Micro Amps are hand-built in Montana, USA.


An external AC charger "wall-wart" [not a true AC power supply!] comes included with the Portable Micro Amp/DAC. The charger operates with all worldwide voltages; however, you may require a

*The Portable Micro Amp does NOT include any interconnect cabling. If purchasing a Portable Micro Amp with DAC option and want to use it with your computer, you'll need a digital USB cable. If using the coax or optical S/PDIF digital inputs, you will need an Optical Digital Cable along with a Toslink to Mini Adaptor or a 75 Ohm coaxial digital cable along with the Mini Coax plug adaptor. To hook up your Micro Portable Amp to analog-output sources, you will need a mini-plug 1/8"-to-1/8" (3.5mm) interconnect cable. We highly recommend the Cardas 12-inch mini-to-mini interconnect cable. For additional cables and lengths, browse all of our audio interconnect cables.


  • Weight: 12 oz (340 grams)
  • Frequency Response: 10–50k, ±0.3
  • Amplifier Group: The Micro Line
  • Input Impedance at 1kHz (ohms): 70k
  • THD at 1V output: <.002%
  • Dimensions: 3.5" x 4.5" x 1.5"
  • Portable: yes
  • DAC option: yes
  • Warranty: 2 Years
  • Output Impedance: 0.5 ohm
  • Output Voltage: 2.5Vrms

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