East MARCUS RETRO Owner's Manual
The EAST MARCUS RETRO is an active/passive retro-fit for J-Style basses, designed to fit Marcus 4 signature basses without modification. It includes a three-band equalizer with bass, variable frequency mid, treble, and bright function, providing a wide range of tone shaping capabilities. The active blend circuit prevents signal loss, allowing for a smooth and clear tone when using both pickups. A passive mode is included for situations where a battery is not available. The MARCUS RETRO is a versatile upgrade for your bass, adding flexibility and control over your sound.
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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.
!
!
!
VOLUME & BLEND
BASS & TREBLE
MID LEVEL & FREQUENCY
!
!
!
!
!
!
!
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
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.
!
!
!
VOLUME & BLEND
BASS & TREBLE
MID LEVEL & FREQUENCY
!
!
!
!
!
!
!
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
!
!
PASSIVE TONE & P-P ACTIVE/PASSIVE
POWER
(Single Knob)
!
!
ACTIVE / PASSIVE
PASSIVE TONE
Pull for PASSIVE, Push for ACTIVE.
Conventional passive tone which acts directly on the output of each individual pickup. Since pickup
signals are separated until they reach the electronic blend stage, a dual pot is required in order that there is
an individual passive tone section for each pickup.
The power is switched on automatically when a mono jack is plugged into the jack socket.
!
PASSIVE TONE & P-P ACTIVE/PASSIVE
POWER
(Single Knob)
!
!
ACTIVE / PASSIVE
PASSIVE TONE
Pull for PASSIVE, Push for ACTIVE.
Conventional passive tone which acts directly on the output of each individual pickup. Since pickup
signals are separated until they reach the electronic blend stage, a dual pot is required in order that there is
an individual passive tone section for each pickup.
The power is switched on automatically when a mono jack is plugged into the jack socket.
ACTIVE
PASSIVE
MID
Boost & Cut Boost & Cut
Boost Only Pick-UpsFrequency
Pull Knob
BRIGHT
TREBLE
BASS
VOLUME
MID BLEND
VOLUME
Passive
Equal Mix
Knob
Setting
BLEND
MIX
BOTH
PU's
PULL FOR PASSIVE
PASSIVE TONE
Operates in Passive
Passive
Equal Mix
BOTH
PU's
BRIDGE
PU
PUSH FOR ACTIVE
Operates in Active
PASSIVE TONE
CURRENT VERSION
PASSIVE
MID
Boost & Cut Boost & Cut
Boost Only Pick-UpsFrequency
Pull Knob
BRIGHT
TREBLE
BASS
VOLUME
MID BLEND
VOLUME
Passive
Equal Mix
Knob
Setting
BLEND
MIX
BOTH
PU's
PULL FOR PASSIVE
PASSIVE TONE
Operates in Passive
Passive
Equal Mix
BOTH
PU's
BRIDGE
PU
PUSH FOR ACTIVE
Operates in Active
PASSIVE TONE
CURRENT VERSION
SCREW
TERMINALS
NECK
BRIDGE
NECK
PICKUP
BRIDGE
PICKUP
SCREW
TERMINALS
NECK
BRIDGE
COLD
HOT
COLD
HOT
FROM PICKUPS
NECK
BRIDGE
TERMINALS
NECK
BRIDGE
NECK
PICKUP
BRIDGE
PICKUP
SCREW
TERMINALS
NECK
BRIDGE
COLD
HOT
COLD
HOT
FROM PICKUPS
NECK
BRIDGE
5
6
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Key Features
- Active 3-band EQ
- Active Blend Circuit
- Passive Mode
- Bright Switch
- J-Style Bass Compatibility
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Frequently Answers and Questions
How do I use the blend control?
Turn the Blend knob fully clockwise for the neck pickup alone, fully anti-clockwise for the bridge pickup, and midway for an equal mix of both pickups.
What is the purpose of the Bright switch?
Pulling the Treble knob activates the Bright setting, adding an extra boost at 7kHz.
How do I switch between active and passive mode?
Pull the PASSIVE/ACTIVE knob for passive mode and push it in for active mode.
What is the function of the passive tone control?
The passive tone control acts directly on the output of each individual pickup, providing a separate tone adjustment for each pickup.
Does this unit come with installation instructions?
The EAST MARCUS RETRO Owner's Manual includes detailed installation instructions.
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