Mesa/Boogie Walk About Bass Amplifier owner manual Rear Panel Controls

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 three elements to this circuit which are; (1) a male XLR jack, (2) a POST / PRE switch and (3) a GROUND LIFT switch.

DIRECT OUT	Here are their functions and how to use them:
POST	PRE

GROUND

LIFT

POST / PRE: This switch lets you choose the type of signal you wish to send to the console. POST gives you the entire sound of the pre-amp with the PARAMETRIC EQ and the EFFECTS LOOP (including processing from anything in the loop).

PRE gives you just the sound of your instrument with noWalkAbout enhancement so that an engineer can create their own sound with your unprocessed signal at the console. This is very handy for sound reinforcement applications as the sound you use on stage may be too big with enhanced low end for a large venue house application.

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: 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.

EFFECTS LOOP

RETURN SEND

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 recom- mended 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

SPEAKER OUTPUTmay also be used though the overall power will be reduced to roughly 150 watts using this rate of imped- ance.

SUGGESTED LOAD

4 OHMS

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