Midi Channel; 100 Watt/60 Watts (Half Power Switch) - Mesa/Boogie JP-2C Owner's Manual

The JP-2C Midi Channel pot detents correlate to the Midi Channels in this manner; Pot Detent Position (Rotating Clockwise From

0) = Midi CHANNEL

Rotary DIP
Switch Position
0
1
2
3
4
5
6
7
100 WATTS/60 WATTS (Half Power Switch)
100 WATTS (switch up) to approximately half power, 60 WATTS (switch down), for lower volume, increased clip or smaller venue
applications. This is accomplished by putting two of the power tubes in a "standby" mode where the filaments are still on and kept
warm, but high voltage is prevented from getting to them. This reduces overall power by approximately half, resulting in a total (RMS)
power rating of approximately 60 watts.
Don't expect huge changes in volume when selecting the 60 WATT position... remember the output tubes are still be-
100 WATTS
ing shoveled current quickly by the massive output transformer. So even though the wattage is less by nearly half, the
urgent attack and bold punch delivered in this power mode is still quite impressive. The biggest difference you notice
may be in the form of slightly earlier onset of clip in Channel 1 for Clean sounds, an increase in overall brightness and
a slight scoop in the lower midrange fullness.. In other words, brighter, easier to push, elastic/bouncy feeling and a
60 WATTS
little more stripped sounding.
If you prefer the sound and feel of the 60 WATT mode, by all means, leave it set there. It won't hurt the amplifier and you can even
swap the tubes, rotating the two pairs in and out of service to increase the interval between re-tubing (power tubes).
NOTE: To achieve the full 60 WATTS of power and a better overall sound, move the Speaker from the 8 Ohm SPEAKER Output
jack to the 4 Ohm SPEAKER Output jack. This scenario sounds bolder and punchier and puts a more correct load on the Output
transformer when in the 60 WATT power mode. If you prefer the sound with the Speaker still connected to the 8 Ohm SPEAKER
Output, feel free to leave it there, but realize your overall power will be lower and the sound may be a bit "slower and looser", have less
punch in the midrange and be a bit darker on the top end. Some players prefer this mismatch, especially for more vintage inspired
sounds and it is acceptable to use the amplifier this way.
That pretty much wraps up our tutorial of the JP-2C's features. Now it's your turn to take this powerful tool into your musical world
and put it to use exploring uncharted frontiers. We sincerely hope it takes you places you've never been and allows you to express
in new and exciting ways. Learning it's Controls and Features will make you fluent in the language of TONE and enable you to roam
wherever you feel inclined stylistically with confidence.
From all of us here at MESA/Boogie, welcome to the Family and we wish you many years of inspiration and enjoyment from your
new instrument.
MIDI CHANNEL SELECTION
Selected
MIDI Channel
1
2
3
4
5
6
7
8
This switch allows you to cut the Power from the output section from the full
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Rotary DIP
Switch Position
8
9
A
B
C
D
E
F
Selected
MIDI Channel
9
10
11
12
13
14
15
16