Flat EQ is achieved with this control set fully clockwise.
Cut
The
Cut
control is a passive treble cut located in the power amp section. This
control can tame the upper registers beyond the frequency range emphasized by
the Treble control. This is especially useful if you're overdriving the
amplifier—allowing you to tame the harmonics added by distortion introduced in
earlier stages and in the power amplifier itself.
For a cranked tone, turn up the Treble control—which will push the tubes a little
harder—and also turn up the Cut control, in turn, to tame the resulting high end.
Flat EQ is achieved with this control set fully counterclockwise.
Additional Information on Flat EQ
Although, technically, flat EQ is achieved with the Treble and Bass controls at
around 11 o'clock, the Middle control fully clockwise, and the Cut control fully
counterclockwise, most guitar players are used to playing amplifiers with a
midscooped sound, so the D
₂
O may actually sound subjectively neutral with all
controls set at 12 o'clock.
It is difficult to make this amplifier sound bad! Experimentation with extreme and
bizarre EQ settings is highly encouraged. Don't be afraid to try setting knobs all
the way up or all the way down. Try a lot of different settings and see what works
for you.
Matching Speaker Load
A common point of confusion is how to set the output impedance of the amplifier
in order to match the attached speaker load. If only using a single speaker
cabinet, this is easy. Set the impedance selector switch to match the impedance
of your speaker cabinet and plug your speaker cabinet into the
MAIN
speaker
output.
The two speaker outputs on the D
₂
O are wired in parallel. When connecting two
speaker cabinets, using both the
MAIN
and
AUX
outputs, the rule is that both
speaker cabinets must be the same impedance and the total impedance seen by
the amplifier will be
half
the impedance of one speaker cabinet by itself. For
example, if you connect two 8Ω speakers, one to each output jack of the D
₂
O,
you should set the impedance selector switch to 4Ω.