User Manual

Stack Section 138
distortion has a sparkling quality to it and preserves every nuance of the strings and pickups. Together with the
characteristics of the actual speaker, the individual distortion behavior creates the fingerprint that identifies the
amplifier.
 Power Sagging
“Power Sagging” models the interaction between the guitar signal and the distortion stage. Increase the amount of
“Power Sagging” to emphasize the velocity and energy of crunch sounds. The guitar sound gains additional energy
and presence, without raising the perceived volume of the distorted signal. When you turn “Power Sagging” beyond
50%, you go beyond what can be achieved with an analog tube amp, but without losing any of the natural
characteristics of the sound. At full force, “Power Sagging” can make sparkling clean notes sound louder than
distorted ones, so you can use it to expand the dynamic range of the original sound. With “Power Sagging” set to
0%, the original dynamic range of the PROFILE is maintained.
Power sagging is a phenomenon that occurs when the tubes draw a lot of electric power at high distortion rates,
thereby weakening the supply voltage. Under such load, the tubes will change their distortion characteristics and sort
of shut down; then as soon as the load lessens, the tubes catch their breath again. What might at first seem like a
technical limitation of the tube amp design has turned out to be a real benefit for the musical expressivity of the
guitarist. The PROFILER masters this technical behavior without degrading or changing the basic character of the
amp model whatsoever.
• The amplifier interacts with the guitarist and reacts to the plectrum and fingers with the highest possible sensitivity.
• The guitar sound gains extra energy and presence, without raising the perceived volume of the distorted signal.
• Muted picking gives better results than usual, as the plectrum will not be suppressed.
• The realms of clean and distorted sounds move closer together, causing the velocity and energy of the crunch
sounds to grow. The amp doesn’t just distort everything mercilessly - all the nuances are represented faithfully. The
overall sound becomes much more alive, with more punch and juice. It almost sounds as if a compressor has been
switched off, thereby allowing the guitar to establish itself more easily among the other instruments on stage, such
as the drums or bass.