IN
This is the input jack of the amplifier. It accepts a standard ¼” phone plug like
that found on any standard instrument cable. The output of your instrument, or
of the last effect in your effects chain if you are using effects, should be
connected here using a standard instrument cable.
VOL
This knob controls the output level of the amplifier. This knob not only
affects the sound pressure level ultimately produced by your speaker cabinet, but
the amount of distortion produced internally inside of the amplifier. Both sound
pressure level and distortion increase as the control is rotated clockwise.
BASS MID TREBLE CUT
These four knobs, collectively, are used to control the
frequency response of the amplifier, allowing it to adapt to different instruments,
speaker cabinets, and the user's musical intention. See the section on tone
controls for more information.
STDBY
This switch, when
down,
mutes the output of the power amplifier stage.
If the unit is powered on, use of this switch can keep the output of the amplifier
muted while allowing the tubes to remain warm and ready to amplify, thus
keeping the amplifier in a hot standby mode. With the switch in the
up
position,
the power amplifier stage is unmuted and the unit operates normally.
POWER
This switch turns on the amplifier. There is a small time lag (15 to 20
seconds) between when the unit is turned on and when the tubes have warmed
up enough to begin amplifying. Once the tubes have warmed up the amplifier is
ready for use and will operate normally.
Pictured here is the rear control panel of the D
₂
O Amplifier:
From left to right we have:
POWER
The power inlet accepts a standard IEC power cable much like you may
be accustomed to using with computers or other electronic equipment. Obviously,
a cable must be attached here and plugged into a power source in order for the
amplifier to function. Amplifiers sold in North America will come with a power
cable included. Amplifiers sold outside of North America will be sold without a
power cable. The user will need to provide a power cable that fits local electrical