3
2
The Desktop Portable Amp
2.
Headphone
Outputs
1.
Power
Switch
3.
Input
selector
Switch
6.
Volume
Control
4.
Crossfeed
Switch
5.
Gain
Switch
1. Power Switch
When the power is set to ‘on’; the green LED will illumi-
nate in the center of the HeadRoom logo in the upper left hand corner of the
amp. We recommend turning the amp off when not in use to avoid draining
the batteries.
2. Headphone Outputs
The headphone out is where you plug in your
headphones. The Portable Desktop Amp is equipped with a 1/4” jack as well
as an 1/8” jack, to accomodate various types of headphones.
3. Input Selector Switch
Choose between analog or digital inputs with
the flick of this switch.
4. Crossfeed Switch
This switch engages the crossfeed circuit. Audio im-
aging 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 cross-
feed 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.
5. Gain Switch
The 3-position Gain Switch accomodates various head-
phones’ power needs. For instance, the Low Gain setting would be used for
ear canal headphones, allowing a larger range on the volume control pot. Ex-
periementing with your headphones and the gain switch may help you to de-
termine which setting you prefer. If have any questions regarding your head-
phones, feel free to call and ask us.
6. 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 effi-
ciencies, 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.
The Portable Desktop Amp Front Panel
Front Panel Descriptions
