EFFECTS GUIDE
44
Doc v6.00c
HI FREQ, HI RES
– A loudspeaker voice-coil presents an inductive load to the power amp at high
frequencies. This inductive load, in conjunction with the output transformer capacitance, creates a high-
frequency resonance at the specified frequency.
XFRMR LF, XFRMR HF
– These set the output transformer bandwidth.
SPEAKER DRIVE
–This parameter simulates distortion caused by pushing a speaker too far. It interacts with
the
MASTER
,
which determines how hard the actual power amp is pushing.
Amp EQ Page
The amplifier includes a built-in, 8-band graphic equalizer, eliminating the need to follow the amp with a separate
EQ block for additional tone-shaping.
Amp Dynamics Parameters
5.1.2
SUPPLY SAG
– This controls power amp dynamics. Higher settings simulate higher power supply impedance,
and thus greater tube plate voltage “droop,” for a more compressed feel. This control interacts with the
Master and will have little effect if the power amp is not being pushed. As the power amp is pushed and draws
more virtual current from its virtual power supply, the Sag control will have more effect.
IMPORTANT:
Turning this control fully counterclockwise defeats power amp simulation for an individual
AMP block so you can use it as a PREAMP into an external tube power amp without globally disabling power
amp simulation (see section
8.1
on p.
133
or the “FOH + Real Amps” diagram on p.
22
.
DYNAMICS
– This controls the amount of dynamics processing and models the interaction between the
power amp, power supply and loudspeaker under high power-level conditions.
XFRMR MATCH
– Transformer Match is an extremely powerful parameter that sets the relative output
transformer primary impedance to determine how easily the power tubes are driven into clipping. Higher
MASTER
Volume settings result in a more pronounced effect. Increasing
XFRMR MATCH
causes power tubes to
clip
sooner
. Decreasing
XFRMR MATCH
causes power tubes to clip
later
and therefore the phase inverter and
grid clipping becomes more predominant. At higher settings, the resonance settings on the SPEAKER page of
the AMP block will be more pronounced. For optimum results bring up the
MASTER
until the desired amount
of power amp distortion is achieved, then adjust matching until the character of the distortion is as desired.
The various LF and HF resonance parameters interact strongly with this parameter so be sure to experiment
with those as well when crafting a tone.
XFRMR DRIVE
– Simulates core saturation in the output transformer. Higher values simulate more core
saturation and, therefore, more transformer distortion.
Advanced Amp Parameters
5.1.3
INPUT SELECT
– The AMP block processes audio in mono. This control determines how incoming stereo
signals will be processed. Options include inputting only LEFT or RIGHT channels or SUM L+R (the default
setting).
Summary of Contents for AXE-FX II
Page 1: ...Owner s Manual ...
Page 82: ...EFFECTS GUIDE Doc v6 00c 71 ...
