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SWR Professional Series – Marcus Miller Preamp

The Missing Link Between Your Bass And A Great Sound!

SWR has partnered with Marcus Miller – arguably the most influential bassist of his generation – to create the ultimate tool for bassists. Or as Marcus calls it: “The missing link between your bass and a great sound!”

Working closely with our SWR engineers, Marcus painstakingly customized the feature set of this preamp to accommodate his own distinctive array of tones, while taking into consideration the needs of other bassists of all styles. The result is simply one of the most versatile bass products ever developed.


Model Number



Tube Bass Preamplifier


One (Two Selectable Inputs for Easy Instrument Changes)

Input Impedance

>820kO (Front panel Inputs); 10KO (Rear panel Input)


+4 dBu preamp output with 12mV 1kHz input, Gain and Volume at MAX, all tone controls flat (center detent), Aural Enhancer at mid position, Effects Blend at DRY, Bass Intensifier, Compression, and Boost OFF

Front Panel Controls

Inputs • Mute On/Off Switch • Bass Intensifier™: On/Off Switch, Level, Cutoff • Compression: On/Off Switch, Threshold, Ratio, Comp Position, Attack, Release, Meter • Boost: Level, Comp Blend, Level/Comp Blend On/Off Switch • Pad On/Off Switch • Preamp Clip LED • Gain • Aural Enhancer™ • EQ: Bass, Semi-Parametric EQ with (Low, Mid, High), Treble • EFX Blend • Master • Power Switch

Rear Panel

XLR and 1/4" Preamp Out with Ground Lift Switch • Tube DI with XLR and 1/4" Out with Ground Lift Switch, Level, 00 to 1800 Phase Switch and 3-Position Direct (Pre)/Compressor Output/Line (Post) Switch • Effects Send and Return Jacks • Footswitch Jack • Tuner Out Jack • Aux Input Jack (Instrument)


Height: 8.9 cm
Width: 48.3 cm
Depth: 28.3 cm


5.9 kg

Tube Complement

2 x 12AX7


Brushed Blue Anodized Aluminum Rackmount Panel with Black Control Knobs and Chrome Handles


4-Button Footswitch (Bass Intensifier, EQ Bypass, Effects Loop, Boost) Included


4-Button Footswitch (Bass Intensifier, EQ Bypass, Effects Loop, Boost) Included, P/N 0075431000



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