User Manual
KEMPER PROFILING AMPLIFIER50
With completely clean sounds you don’t need to worry about refining the distortion characteristics, so
“Refine profile” isn’t available. If you find that the profile oers a wider dynamic range, and a higher vol-
ume in the transients compared to the original, the reason is probably that the original sound was, in fact,
slightly distorted. This would have caused a small amount of compression, thereby aecting the result of
the profiling process. In such a case, simply repeat the whole procedure, but without using the “Clean” op-
tion.
Power amp tubes generate a dierent type of overtone structure than preamp tubes. They distort with a
harsher sound, because the negative feedback in the power amp circuit linearizes the tube amplification.
This makes the distortion curve edgier. If you notice in the A/B comparison that the reference amp pro-
duces more high frequency distortion when light distortion is applied, you should set the “Tube Shape”
parameter to about 9.0, to get the same behavior from the profile.
When you feel that you have refined the profile enough, press the blinking soft button to stop the process.
Now make another A/B comparison to check the result. Repeat the process if necessary as many times as
needed.
The resulting profile
Once you are happy with the result of the profiling, you can store the sound in the KPA as a new rig. We
highly recommend that you save the profile before you start modifying its parameters to preserve the
original settings.
Congratulations! You have added a new amp and a new cabinet to your KPA’s arsenal. You are now free to
combine each of them with other amps or cabinets in the KPA to create new hybrid stacks.
You will notice that the GAIN knob is automatically set to the same (audible) position as the reference amp
and the amp volume is the same as the other amp volumes to make it easy to compare dierent amps. The
actual gain range of the KPA is probably much larger than your original amp. This means that you can play
the new profile from ultra clean to super distorted, even if you couldn’t do so on the reference amp itself.
In those situations where the reference amp was clean, the GAIN knob will be set to the minimum posi-
tion, while retaining all of the original volume. Of course, you’ll have no trouble turning up the GAIN knob