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1. Line Input
Plug your source into the Micro Amp here. in most cases your
source will have a line-out or headphone jack, so you will need a mini-mini
cable. If you have a digital source, then ideally you’re using the Micro DAC and
will connect it here via mini-mini cable (see pgs. 8 & 9 for more info on hooking
up your Micro Amp).
2. Headphone Out
The headphone out is where you plug in your headphones.
There isn’t room for a full sized jack, but this 1/8” mini-plug will take the small
plug of all 1/8” headphone jacks. We also sell a short flexible Grado 1/4”-1/8”
adaptor for your big cans; and you can get a replacable Cardas headphone
cable with a mini connector for many types of headphones, call us or consult
our website for details.
3. Crossfeed Switch
This switch engages the crossfeed circuit. The audio
image on headphones is often not very good; typically the image is a blob on
the left, a blob on the right, and a blob in the middle. The HeadRoom crossfeed
provides the natural acoustic cross-feed normally heard at the left and right ear
as heard from the left and right speaker. Adding back the normally occurring
cross-feed signal gives your brain enough information to build the stable and
natural audio image needed to have a quality listening experience. See pg.7
for more info on the HeadRoom crossfeed.
4. Gain Switch
The 3-position Gain Switch accomodates various headphones’
power needs. For instance, the Low Gain setting would be used for ear canal
headphones (which are extremely efficient), allowing a larger range on the
volume control pot. Experimenting with your headphones and the Gain Switch
will help you to determine which setting you prefer.
5. Volume Control
As you turn the volume control knob clockwise, the volume
increases. You never know where the volume control should be set as different
headphones often have widely different impedances and efficiencies, so use your
ears to choose your listening level, not the level on the dial. We recommend you
choose a moderate level so as not to blow out your ears; a general rule of thumb
is to adjust the volume only one or two knotches above ‘sounding too quiet’. It
is important to turn the amp OFF or ALL THE WAY DOWN before plugging in or
unplugging your headphones to avoid short-circuiting the amp.
6. Power Switch
Use this switch to turn your Micro Amp on. The red LED will
illuminate in the center of the HeadRoom logo in the upper left hand corner of
the amp. There is nothing wrong with leaving your amp ‘on’ or ‘off’ for lengthy
periods of time; but of course if its ‘on’ it will drain your batteries when the unit
is not plugged in. We recommed that you unplug your amplifier if you’re storing
it for a long period of time.
Front Panel Description