Fractal Audio AX8 Owner's Manual page 51

7 BLocKS GuIde
parameter for setting the output level of a preset.
AMP SPEAKER PAGE
These parameters shape the virtual speaker impedance curve and the resulting resonances in the virtual
power amp. Amp/Speaker interaction affects tone by causing an increase in power amplifier response at
certain frequencies. Note that setting greater than "0" flattens the response curve.
NEGATIVE FEEDBACK
– Guitar loudspeakers have strong low-frequency resonance, typically at about
LOW FREQ, LOW Q, LOW RES
100 Hz. This shifts up slightly when the speaker is mounted in an enclosure. This resonance causes an
increase in the power amplifier response due to the finite output impedance of the power amp.
– A loudspeaker voice-coil presents an inductive load to the power amp at high frequencies.
HI FREQ, HI RES
This inductive load, in conjunction with the output transformer capacitance, creates a high-frequency
resonance at the specified frequency.
– This parameter allows fine adjustment of the high-frequency impedance of the virtual voice coil
SLOPE
(which affects the slope of the impedance curve). A speaker voice coil is "semi-inductive" due to eddy
current losses in the motor. This presents an impedance to the power amp that is neither fully inductive nor
fully resistive. The amount of resistive loss varies by brand and type. Reducing the Slope simulates a speaker
that is less inductive, increasing Slope simulates a speaker that is more inductive. Typical speakers range
from 3.0 to 4.5 with the median being about 3.7. Lower values yield greater midrange while higher values
are more scooped and sizzly.
– These set the output transformer bandwidth.
XFRMR LF, XFRMR HF
–This parameter simulates distortion caused by pushing a speaker too far. It interacts
SPEAKER DRIVE
with the which determines how hard the actual power amp is pushing. Don't overlook this when
MASTER
striving for "vintage" tones as helps make edge-of-breakup tones sound like an old, well-played amp.
– Models core saturation in the virtual output transformer. Higher values simulate a smaller,
XFRMR DRIVE
more easily saturated transformer. The distortion produced by an overdriven output transformer isn't
particularly pretty but it does play a role in the tone and without it the distortion would not be authentic.
AMP EQ PAGE
The amp block includes a built-in graphic EQ, eliminating the need to use a separate block for tone-shaping.
You can achieve different results by changing or in the Amp's ADVANCED menu. To
EQ LOCATION EQ TYPE
reset the EQ to flat, tap ENTER.
To operate the Graphic EQ, turn the E/NAV knob to select a range of faders controlled by A,B,C, and D.
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