12
9. EQ+EFX FOOTSWITCH – Connect a two-button footswitch, terminating to a ¼”
TRS connector (Tip = EQ, Ring = EFX) to this jack to control the GEQ and EFX select
switches. The front panel switch is disengaged when the footswitch is plugged in.
10. EFFECTS RETURN LEFT/MONO – Use this ¼” unbalanced jack to return low im-
pedance (600 ohm) signals to the left side amplifier from a professional outboard
effects processor. When the amplifier is in Mono Bridge mode, this jack feeds the
power amplifier input.
11. EFFECTS RETURN RIGHT – Use this ¼” unbalanced jack to return low impedance
(600 ohm) signals to the right side amplifier from a professional outboard effects
processor. When the amplifier is in Mono Bridge mode, this jack is inactive.
12. EFFECTS SEND MONO – Use this ¼” unbalanced jack to send low impedance (100
ohm) signal, to a professional outboard effects processor such as a reverb, echo,
chorus, flanger, or harmonizer device. Output level is approximately 0 dB to +4 dB,
and is post-EQ and post-compression, but is unaffected by the master VOLUME
control. You can also use the EFFECTS SEND jack to route signal to an external mix-
ing console or amplifier with an input sensitivity of +4 dB.
13. PREAMP OUT LEFT – This output jack is fed from the left preamp (after the effects
return), and may be used with an external power amplifier, to connect to a mix-
ing console, or to any other line level device. Use a standard ¼” instrument cable
when connecting to external devices.
14. PREAMP OUT RIGHT – This output jack is fed from the right preamp (after the
effects return), and may be used with an external power amplifier, to connect to
a mixing console, or to any other line level device. Use a standard ¼” instrument
cable when connecting to external devices.
15. POWER AMP IN LEFT – This line level input connects directly to the left internal
power amp, and can be used with external preamps, or to connect a CD/MP3
player. Use a standard ¼” instrument cable when connecting devices to this input.
The internal signal path is interrupted when a cable is connected to the POWER
AMP IN jack. When the amplifier is in Mono Bridge mode, the POWER AMP IN LEFT
and POWER AMP IN RIGHT jacks mix together for a mono feed to the power ampli-
fier input.
16. POWER AMP IN RIGHT – This line level input connects directly to the right inter-
nal power amp and can be used with external preamps, or to connect a CD/MP3
player. Use a standard ¼” instrument cable when connecting devices to this input.
The internal signal path is interrupted when a cable is connected to the POWER
AMP IN jack. When the amplifier is in Mono Bridge mode, the POWER AMP IN LEFT
and POWER AMP IN RIGHT jacks mix together for a mono feed to the power ampli-
fier input.
17. DIRECT OUT GROUND LIFT Switch – When pressed in (the “GND LIFT” position),
pin 1 is removed from the chassis. This should be used only when a ground loop
hum or buzz is heard. Otherwise, leave it in the out (“NORMAL”) position.
Rear Panel
