Master Volume
Set the overall level of the Loudbox Pro with the Master Volume. In general put the
Master Volume as high as possible (3 o’clock to 5 o’clock) to achieve a clean quiet
signal. Because the system can easily produce sound pressure levels in excess of
122dB, we strongly suggest that you wear hearing protection when you play at higher
volumes.
Mute
The mute switch shuts off the signals from Channels 1 and 2 to the speakers and the
XLR output. The mute does not affect the Aux Channel or the effects sends.
Power
Lower the master volume or engage the mute switch before you turn on the amp to
avoid any surprises. Flip the power switch up and it will light, indicating the amp is
on.
Rear Panel
AC Power
For 120V amplifiers purchased in the USA, Canada, and Mexico, plug in the supplied detachable AC
power cable.
For 240V amplifiers purchased outside the USA and Canada, you must supply your own detachable
AC cable. This cable must have an IEC-style 320 connector at one end, and a male AC plug
appropriate for your area at the other.
Fuse Holder
The fuse is located within the AC power receptacle on the back of the amp. Access the fuse
compartment with a small slotted screwdriver.
For 120V amplifiers purchased in the USA and Canada, replace the fuse with: Littelfuse
®
type
H218005 or equivalent 5 x 20mm, 5A, 250V, time-delay fuse.
For 240V amplifiers purchased outside the USA and Canada, replace the fuse with: Littelfuse
®
type
H21802.5 or equivalent; 5 x 20mm, 2.5A, 250V, time-delay fuse.
Effects Loops
Ch 1 Effects Loop (serial)
Patch an external effect (delay, reverb, chorus) through these jacks. Use a standard 1/4" instrument
cable to connect the Ch 1 send to the input of the effect. Connect the Ch 1 return jack to the output
of the effect. The loop is located “pre-EQ” and is compatible with battery-operated stompbox-style
effects processors.
You may also connect the Ch 1 send jack to an external tuner or to an additional stage amp.
Ch 2 Effects Loop (serial)
Patch an external effect (delay, reverb, chorus) through these jacks. Use a standard ¼" instrument
cable to connect the Ch 2 send to the input of the effect. Connect the Ch2 return jack to the output
of the effect. The Ch 2 loop is located “pre-EQ” and is compatible with battery-operated stompbox-
style effects processors.
You may also connect the Ch 2 send jack to an external tuner or to an additional stage amp.
XLR Out
Use this balanced output to route your instrument’s signal to a mixing console, PA, etc. This output
is always ground lifted to reduce ground-loop hum.
XLR Pre/Post EQ switch
Select between a true DI (pre) or an affected XLR output (post EQ).
1. XLR Post EQ
The “Post” setting is useful in live situations, especially if you are mixing from onstage, where you
want the “dialed-in” sound from the amp to come through the PA.
2. XLR Pre
You'll find that this true direct or “DI” output produces an uncluttered signal that is exceptional for
recording. Set the switch to the “Pre” position when you want a flat DI signal going to the board
and you wish to leave it to the soundperson or recording engineer to dial up your tone and effects
from the console.
Front Panel -
Channel 1
(instrument channel)
Input
This input has a very wide operating range. It will accept high- or low-level signals
from active or passive pickups.
Clip LED
The Clip LED will flash when the gain level is too high and the signal becomes
distorted. If the light comes on when you play, lower the gain until the distortion goes
away.
Gain
Use the Gain knob to set the level of the signal for Channel 1. If the red LED flashes
when you play, lower the gain until the flashing stops. If Channel 1 is unused, set the
Gain to 7 o’clock.
Low
Shelving bass, ±10 dB @ 100Hz. Boost here to add weight to the sound. In general,
boost bass at low volumes and flatten it out (or cut) at higher levels. With the dial set
at 12 o’clock, the control is effectively out of the circuit.
Mid
A resonant-style filter, ±12dB @ 1.2kHz. This control affects how well the instrument
blends in or stands out in the mix. At loud volumes a midrange cut will achieve a
more natural sound. With the dial set at 12 o’clock, the control is effectively out of
the circuit.
High
Shelving treble, ±12dB @ 10kHz. Boost highs to add “air” to the sound of the
instrument. With the knob set at 12 o’clock, the control is effectively out of the
circuit.
Brilliance
A resonant-style tone circuit, ±12dB @ 10kHz. Add presence and “zing” to high
frequencies. With the knob set at 12 o’clock, the control is effectively out of the
circuit.
Anti-Feedback
A fixed-level, variable-frequency notch filter -14dB @ 20 - 400Hz. If you encounter
low-frequency feedback, sweep this control to isolate and eliminate it. Many guitars
will benefit with the Anti-Feedback knob set at about 11 o’clock. The Anti-Feedback
filter is off at the 7 o’clock position.
Phase
Use the phase switch in conjunction with the Anti-Feedback filter to eliminate
acoustic feedback.
8
5
Channel 1
Gain
Low
Mid
High
Br
Clip
Loudbox Pro
TM
Channel 1
Gain
Low
Mid
High
Br
Clip
Loudbox Pro
TM
Channel 1
Gain
Low
Mid
High
Br
Clip
Loudbox Pro
TM
Channel 1
Channel 1
Gain
Low
Mid
High
Br
Clip
Loudbox Pro
TM
Channel 1
Channel 1
Gain
Low
Mid
High
Br
Clip
Loudbox Pro
TM
Channel 1
Gain
Low
Mid
High
Br
Clip
Loudbox Pro
TM
Off
hannel 1
Gain
A
Fee
Low
Mid
High
Brilliance
Clip
Loudbox Pro
TM
Off
Gain
Anti
Feedback
Low
Mid
High
Brilliance
ip
Phase
Loudbox Pro
TM
Off
Gain
Anti
Feedback
Low
Mid
High
Brilliance
Phase
oudbox Pro
TM
Mute
Power
Aux Level
Master
Volume
n
Mute
Power
Aux Level
Master
Volume
n
Mute
Power
Aux Level
Master
Volume
n
Ch 1
Ch 1
Ch 2
Ch 2
XLR
Pre / Post EQ
Ch 1
Ch 1
Ch 2
Ch 2
XLR
Pre / Post EQ
TM
Loudbox Pro
CAUTION
Risk of electric shock.
Do not open.
No user serviceable parts inside.
Refer servicing to qualified personnel.
Do not expose to rain or moisture.
120V / 240V ~AC
50 / 60Hz - 500W Max
FUSE:
120V 5A / 240V 2.5A
Replace with same type
fuse as indicated.
