3
2
Front Panel
Panel Descriptions
1.
power
switch
2.
headphone
outputs
3.
rear
output
switch
5.
crossfeed
7.
volume
control
The Desktop & Ultra Desktop Amp
1. Power Switch
Turn the switch up to turn your Desktop Amp on. The
green LED will illuminute in the center of the HeadRoom logo in the upper left
hand corner of the amp.
2. Headphone Ouputs
The headphone out is where you plug in your
headphones. The Desktop Amp is equipped with a 1/4” jack as well as an
1/8” jack, to accomodate various types of headphones.
3. Rear Output Switch
The Rear Output Switch mutes or ennables the au-
dio signal. If you are using the amp as a pre-amp, or to listen to self-powered
speakers connected to the Desktop Ultra Amp turn the switch on. If you are
only listening to headphones, turn the switch off.
4. Brightness Switch
The Brightness Switch is used to compensate for
the slightly warming action of the processor. In the center position there is no
filter in the circuit; generally this is preferred. But if you feel the processor is
causing too much bass or blurring of the central image, a mild high frequency
boost filter can be turned on. The “filter 1” setting accentuates the highs at
about 3 kHz; with the “filter 2” setting the filter starts an octave earlier and
catches some of the upper mids. Basically, set it to whatever sounds best to
you.
5. 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.8 for more info on the HeadRoom crossfeed.
6. 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.
Experiementing with your headphones and the gain switch may help you to
determine which setting you prefer.
7. Volume Control
As you turn the volume control knob clockwise, the
volume increases. Be sure to turn the amp OFF or ALL THE WAY DOWN before
plugging in or unplugging your headphones to avoid a potential short-circuit-
ing the amp. The volume control setting wcan vary greatly as different head-
phones often have widely different impedances and efficiencies. 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.)
4.
brightness
6.
gain
switch
