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1. Power Input
Recharge the battery of your Portable Micro Amp by plug-
ging in the charging unit here(use only the included power supply to recharge
your amp.) After several hours, your battery should be fully charged and ready
to go. You may listen to the amplifier while it’s charging, however you may
experience slightly compromised sound quality and battery life. We recom-
mend fully charging your amp without listening, so it may accept a complete
charge. The battery on your Portable Micro will last anywhere from 15-20
hours (if you’re using the DAC on your Portable Micro your battery life will be
lower than using only the analog portion of your amp). The lithium-ion bat-
teries in the Portable Micro are good for approximately 300 charges, at which
point you will need to send your amp back to HeadRoom so a new battery can
be installed. The battery is warrantied for one year; if your battery fails after
this point we will replace it for a small fee. Please contact us for details.
2. Optical/Coaxial Digital Input (DAC Option Only)
The Optical
Input is your typical Toslink connector. Since this is a mini connection, you
will need adaptors if you have full size optical or coaxial cables, the RCA-Mini
Mono Adaptor and the Toslink- Optical Mini Adaptor are available on head-
phone.com. You get this input signal from the optical output of your player.
Not so many portable audio players have optical outputs anymore, but many
portable DVD players and some hard disk drive players do. Of course, a co-
axial output is available from many pieces of home equipment. See pg. 9 for
more hook up information.
3. USB Input (DAC Option Only)
The USB input gets its signal from a
computer: laptop, desktop, or Ultra-Mobile PC; PC, Mac, or Unix. Most com-
puters will instantly recognize the Micro DAC upon plugging it in, but occa-
sionally some users may need to go into the audio preferences and select
the “USB Audio Codec” as their primary sound device. You also may need to
restart your music playing program (iTunes, Windows Media Player, etc) once
the Micro DAC is plugged in. See pg. 9 for more hook up information.
4. Pre-Amp Output
The Pre-Amp Output on the rear of the Micro Amp
is an excellent way to provide a volume controlled output to your desktop
self-powered speakers or as a source for a speaker power amp. The output
is in parallel to the headphone jacks, so you will hear music from both your
headphones and your speakers (although volume levels may vary). In true
pre-amp fashion, the volume pot provides a variable-controlled signal output
to speakers; the louder the volume setting, the louder your speaker signal.
While this output can be used as a second headphone jack, avoid connecting
two highly efficient ear canal headphones to each output, use a splitter from
the front jack instead.
Rear Panel Description
