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Getting to Know Your BitHead Amplifier
Hold the BitHead so the controls are facing you and the rubber battery door is up. Across
the front of the Bithead are a number of connections and controls.
1. Headphone Jack 1-On the far left is one of two headphone jacks that fit any 1/8" (mini)
headphone plug. (An adapter is needed if your headphones are terminated to a 1/4" plug.)
2. Power Switch- The switch on the left is the power selector. While attached to a computer,
having this switch in the left position will power the BitHead entirely from the computer
power over the USB; having the switch to the right will switch the DA converter and ampli-
fier stages over to battery power. While attached to a portable player through the line input,
power will be "off" with this switch to the left and "on" with the switch to the right.
3. Power LED- To the right of the power switch is the green power LED, which indicates wheth-
er the unit is ON (lit) or OFF (unlit).
4. Volume Control- Just to the right of the power LED is the volume control. Rotate the volume
control to the left to increase volume, and to the right to decrease volume. If using differ-
ent pairs of headphones with your AirHead, different headphone efficiencies will most likely
mean that the volume level will need to be adjusted to achieve adequate sound levels in the
headphones.
5. Clipping Indicator- The clipping indicator flashes when the amp doesn't have enough
voltage to drive the headphones. This can happen at peak passages when listening at a fairly
loud level and/or with high impedance headphones. It will also flash when the batteries get
too low in voltage to drive the headphones. Mainly, when the clipping indicator starts to
flash at music peaks, it's time to change the batteries.
6. Crossfeed Switch- To the right of the clipping LED is the HeadRoom Crossfeed switch. Turn
the switch to the right to the ON position, and the crossfeed is engaged (for normal stereo
headphone listening). In the OFF position, the crossfeed is bypassed (for listening to mono
or binaural recordings).
7. Headphone Jack2- On the far right is the second headphone jack. You can connect two
headphones to the BitHead at the same time. It's best to use the same type of headphone, as
the volumes will be somewhat different unless both headphones are the same efficiency.
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