Mesa/Boogie Walk About Bass Amplifier owner manual Helpful Hints

OVERVIEW: Continued

type BASS and TREBLE controls are combined with a passive style MID to produce a powerful string of musically interactive and comprehensive tone controls. If even further tweaking is desired, we have included a 3 Band Semi-Parametric Equalizer that covers frequencies between 30Hz and 12Khz. This in-line EQ assures that any sound you can dream of can be dialed in quickly and accurately. The three bands sensible Q points make for ease of understanding and the FREQUENCY controls overlap to allow pinpoint accuracy in the regions where the controls meet. And finally, a series EFFECTS LOOP patch point between the preamp and the power section.

Now that you have an overview of the controls and features of your new WalkAbout, let’s move on to understanding each of them individually so that you can dial in your own personal sound quickly and easily.

Instant Gratification:

ACTIVE		S I M U L S T A T E TM	B A S S A M P L I F I E R						E N G I N E E R I N G
				0 db		0	0
INSTRUMENT			-15	+	-	+	-	+15
INPUTS				60 Hz	340Hz		2K				ON
	GAIN	BASS	MID					TREBLE	DI LEVEL	MASTER
			30	300	200	2K	1.2K	12K
PASSIVE	FOUR - STAGE VACUUM TUBE PREAMPLIFIER			PARAMETRIC EQUALIZER							POWER

HELPFUL HINTS:

1.Connect your A.C. Power Cable to a grounded outlet. Avoid ground lifts (3 to 2 prong adapter) whenever possible.

2.The optimum speaker load for your WalkAbout is 4 Ohms. You may use a cabinet (s) of a higher rating safely (8 Ohm) with no degradation in tone, however the amplifier will not produce its full rated wattage. Minimum load rating is 2 Ohms and while the WalkAbout will handle this lower load condition - and in fact produce more than its rated power, it is not recommended. Prolonged use of a 2 Ohm load will cause the power mosfets to run hot causing the protection circuit to trigger and mute the output signal until such time as the mosfets can return to a safe operating temperature. Avoid using 2 Ohm loads whenever possible.

3.Use high quality cable from your instrument to the WalkAbout and from the WalkAbout to your speaker. Instrument cable should be relatively low capacitance shielded cable. Whenever possible use lengths of 15 feet or shorter. Longer than 15’ tends to introduce too much capacitance resulting in reduced punch and top end clarity. Speaker cable should be at least 14 gauge (or thicker) unshielded cable and again try to keep the length of cable as short as possible for the best tonal results.

4.The BASS and TREBLE controls are active shelving type controls with a broad response even though they are acting primarily on their center frequency Q point. This broader response works extremely well with the passive, broad-band MID control. Because BASS and TREBLE are active controls, they actually cut (or notch) the region around the Q point when the control is set below 12:00,

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