Mesa/Boogie Walk About Bass Amplifier - Manual (Page 13)

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REAR PANEL CONTROLS:
(Continued
DIRECT OUT:
This section captures the entire pre-amp signal including the SEMI-PARAMETRIC EQ and the EFFECTS LOOP
which in turn allows you to send a Balanced signal to either a House Main Board or a Recording console. There are two elements to
this circuit which are; (1) a male XLR jack, (2) a GROUND LIFT switch.
GROUND LIFT: This switch removes the circuit-to-chassis ground connection from the XLR jack. Leave
it in the grounded position (switch down) normally unless you experience a hum when connecting to a
console.
If you do experience a hum when connecting the XLR Output to a console, try lifting the ground (switch
up) on the circuit. This will usually (but not always) remedy most ground loop type noise from the signal
path. Sometimes it may also be necessary to lift the A.C. Cable Ground also by using a 3-2 ground adapter
to achieve a quiet signal path.
NOTE: NOTE: NOTE: Ground loops can occur in many places in a complex signal path. The DIRECT OUTPUT GROUND LIFT switch is not a cure-
all and therefore should not be expected to remedy every type of ground related problem.
EFFECTS LOOP:
The EFFECTS LOOP section of the WalkAbout is responsible for handling the interfacing of external signal
processing via its RETURN and SEND jacks located on the Rear Panel.
FX ON / BYPASS: The EFFECTS LOOP circuitry can be completely removed from the signal path with
the
FX ON / BYPASS mini toggle. This removes all associated loop circuitry from the chain and ensures
the purest signal path and maximum sonic performance when outboard processing is not being used.
RETURN: This is the patch point between the pre-amp and power amp for returning a processed signal from
your outboard effects back to the WalkAbout. Because this is an input to the power amp, the RETURN
jack can be used to access the power amp only. This is handy to use the WalkAbout as a slave power
amp or when multiple WalkAbout units are connected for large venue applications.
SEND: This is the output of the pre-amp and allows you to send a signal to your effects for processing.
SPEAKER OUTPUT:
The WalkAbout provides two 1/4 inch speaker jacks for powering speaker enclosures. The recommended
speaker load impedance for the WalkAbout is 4 Ohms, at which the mighty SIMUL STATE power section is capable of delivering
a whopping 300 watts RMS before clip and peaks of over 400 watts!
A speaker load of 8 Ohms may also be used though the overall power will be reduced to roughly 150 watts
using this rate of impedance.
EFFECTS LOOP
RETURN SEND
SPEAKER OUTPUT
SUGGESTED LOAD
4 OHMS
DIRECT OUT
GROUND
LIFT