LOW CUT FREQ – Reduces the amount of low frequency (10-1000Hz) before the
preamp input. Use this is to tighten up a tubby bass end. Somewhere between
10-150Hz is generally where it will sound best for standard guitar tones. Also
see CUT (Basic page).
HIGH CUT FREQ – Reduces the amount of high frequency (2k-20kHz) after the
preamp output. Lower the value to make your top end sound smooth and silky,
raise it to make it brilliant and dened.
BRIGHT – High treble control shelving lter between the preamp and power
amp. It may be used to darken or brighten the output of the preamp. It
accurately replicates the “Presence” control found in the Mesa Triaxis preamp
when set to negative values. (In the Triaxis, it is actually a high frequency cut
shelving lter.) Note: this is not to be confused with the BRIGHT switch which
engages/disengages a capacitor across the drive pot.
DEFINITION – A basic “tilt EQ” located at the amp input. It changes the
fundamental character of the amp from vintage to modern or vice-versa.
Positive values increase the amount of upper overtone saturation, negative
values reinforce lower harmonics.
BRIGHT CAP – Sets the value of the capacitor which determines the sonic eect
of the BRIGHT switch. Increase to make the preamp brighter and vice-versa.
MV CAP – Sets the value of the bright cap across the Master Volume pot.
Setting it to 1.0 pF disables it.
Amp Block
TONESTACK TYPE
ACTIVE – Gives each tone control ±12 dB boost/cut making them more
sensitive; they also will not interact with each other.
DEFAULT – Matches the tone stack with the selected amp type.
[AMP] – Replaces the default tone stack with one from another amp.
TONE FREQ – Sets the center frequency of the tone controls. This control works
whether you are using PASSIVE, ACTIVE, or substitute tone stacks.
TONE LOCATION
PRE – Places the tone stack at the input to the preamp.
POST – Places it between the preamp and power amp.
MID – Places it between the last two triode stages.
END – Places it after the power amp (which is impossible with a real amp).
The farther upstream you position the stack, the thinner the sound.
MID will sound chunkiest, with END being rather dark.
The tone stack is one of the main things that gives an amp its particular
voice, as it shapes the frequency response pretty drastically.
For a at tone stack, set the TONESTACK TYPE to NEUTRAL with B/M/T at
noon. This allows the exibility of being able to boost or cut bass and treble.
In the design of some amps the LOW CUT FREQ is dependent upon the
DRIVE setting. In these cases the LOW CUT FREQ parameter defaults to 10 Hz
and the actual low cut ltering is calculated as part of the DRIVE function.
TOP ROW BOTTOM ROW
(9 pages)
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