MARCUS RETRO 01
The MARCUS RETRO 01 is designed to fit directly into Marcus 4 signature basses without
modification. Its high quality circuit uses three stacked knobs and includes an active blend
circuit plus a 3 band equaliser with bass, variable frequency mid, treble and bright function.
The active blend circuit prevents the loss associated with many passive basses where, when
both pickups are up full, the signal from one pickup feeds into the other and vice versa.
However, a switch is included to allow a passive equal mix of both pickups. A second switch -
basic "get-you-out-of-trouble" passive mode is included in case the battery dies in crucial
circumstances, but thismodeallows lots of useful settings too.
(Knob stack nearest the neck pickup)
(Themiddle knob stack)
(The knob stack nearest the jack)
Note:
The version with a plate will fit the 4 string bass only. The 'electronics only' version can
be fitted to a Marcus V, but using the existing plate, which will require an additional hole for the
Pickups Toggle.
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VOLUME & BLEND
BASS & TREBLE
MID LEVEL & FREQUENCY
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VOLUME
BLEND & PICKUPS SWITCH
TREBLE (+12dB @ 1k5Hz, -12dB @ 1kHz)
BRIGHT (+8dB @ 7kHz)
BASS (+15dB @ 40Hz)
BOOST/CUT (+/- 12dB)
FREQUENCY (150Hz - 3kHz)
The upper knob is the Volume. This knob has active circuitry after it so that the feed to your amplifier is a
low impedance drive.
The lower outer knob is the Blend balance for the pickups. Turn it fully clockwise for the neck pickup alone
and fully anti-clockwise for the bridge pickup. The midway position, which has an indent, gives an equal
mix of both pickups. The balance between the pickups is continuously variable with progressive level
compensation towards the single pickup settings.
The
switch (by the blend) must be set pointing towards the jack for the Blend to
function. ( See
&
diagrams for details of how this switch works )
The upper knob is the Treble control with boost and cut. The central 'flat' position is indented. The cut
settings work on lower frequencies compared to boost to give a deeper sound when the top is rolled off.
Pull the Treble knob for the Bright setting.
The lower outer knob is the boost only Bass control. The frequency band of boost gets progressively
lower as the boost is increased. An indent midway is included to aid the setting of this control.
The upper knob controls the amount of Mid boost or cut at frequencies according to the setting of the
Frequency knob. Themidway indent is the 'flat' position.
The lower outer knob is continuously variable and sets the Mid frequencies for boost or cut.
Continued over:
Important:-
Pickups
ACTIVE PASSIVE
Active/Passive Retro-Fit for J-Style Basses