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top view of 4 Knob version of the John East Uni-Pre 3 Band Bass Preamps
John East Uni-Pre 3 Band Bass Preamp with 4 knobs and chrome finish
overhead view of 5 knob version of the John East Uni-Pre 3 Band Bass Preamps
view of John East Uni-Pre 3 Band Bass Preamps with 5 chrome knobs
John East Uni-Pre 3 Band Bass Preamps with 5 knobs and 1 switch
view of the John East Uni-Pre 3 Knob Configuration, including the chrome knobs, chrome switch and the jack
front view of the John East Uni-Pre 3 Band Bass Preamps showing the 3 stacked knobs, 1 switch and jack mounted on a temporary fiber plate
back view of the John East Uni-Pre 3 Band Bass Preamps showing the circuit board and battery clip
view of the John East Uni-Pre 3 Band Bass Preamps showing the 3 concentric chrome knobs, switch and jack mounted on a mounting plate for display purposes
backside view of the John East Uni-Pre 3 Band Bass Preamps showing many colored wires connected to the PCB boards here the electronics are mounted

John East

UNI01-XBB-4K3B

John East Uni-Pre 3 Band Bass Preamps

$370.00 USD - $421.00 USD

wave form bullet iconMID EQ SWEEP FOR ULTIMATE MID-RANGE CONTROL

wrench bullet iconEASY INSTALL USING SCREW TERMINALS

data science bullet iconSMART MODULAR DESIGN

original bullet iconULTRA-HIGH QUALITY COMPONENTS

good bullet icon3 BAND EQ PLUS PASSIVE TONE CONTROL (4 & 5 KNOB VERSIONS)

 

empty box iconFREE SHIPPING IN THE USA
configuration iconEXPERT TECHNICAL SUPPORT
checklist iconIN STOCK MEANS IN STOCK

 

DESCRIPTION

The UNI-PRE 3 Band Preamp is a new generation bass preamp system from East UK. It’s a brand new design that sets new standards with unique features, designed to fit virtually any bass which has 3, 4 or 5 knobs with rear cavity electronics. The modular construction makes for easy installation, with simple plug connections between modules. External wiring, such as pickups and power, are simply connected using screw terminals.

Available in Black and Chrome finish.

CONFIGURATIONS

Uni-Pre 3 Knob, 1 Switch - Volume/Blend Stack -- Mid/Mid Frequency Sweep Stack -- Treble/Bass Stack -- Active-Passive Switch

***As a couresty, we can remove the switch from the 3 Knob configuration for players looking for a 3 Knob, No Switch layout. When checking out, include the following in the order note: "Please Remove Switch".

Uni-Pre 4 Knob - Volume/Blend Stack -- Mid/Mid Frequency Sweep Stack -- Treble/Bass Stack -- Passive Tone with Active-Passive Push-Pull

Uni-Pre 5 Knob - Volume -- Blend -- Mid/Mid Frequency Sweep Stack -- Treble/Bass Stack -- Passive Tone with Active-Passive Push-Pull

Uni-Pre 5 Knob, 1 Switch - Volume -- Blend -- Mid/Mid Frequency Sweep Stack -- Treble/Bass Stack -- Passive Tone -- Active-Passive Switch

TECH & SPECS

  • Totally independent active and passive signal paths guarantee completely smooth blend when set to active.
  • Custom designed pots allow optimal placement of all controls within active and passive signal paths.
  • Class A FET input stages for great sound quality, with two gain trim preset adjusters for each pickup.
  • Operational response of Bass Control can be set internally at both the lower and upper ends of the bass spectrum.
  • Treble Control with internally adjustable frequency voicing, plus Bright as a pull switch.
  • Mid Control with Frequency Sweep.
  • Overall response can be set as flat or with pre-shaper contour, which adds some warmth and sheen.
  • Modular concept allows for easy installation and replacement of parts should that ever be necessary, all with pluggable connections.
  • Screw terminals are used for all external connections such as pickups, power and grounding, for easy installation.


  • FLAT RESPONSE: Neutral response setting.
  • PRE-SHAPE: Gentle lift at the lower and higher frequencies, peaking +4dBs at 40Hz & 10kHz.
  • PICKUP GAIN: Internal Trimmers 0-12dBs for each pickup in Active Mode.
  • BASS CONTROL: +/- 18dBs Cut/Boost with internally adjustable ‘bass window’.
  • BASS WINDOW: Lower Frequency Filter 20-80Hz & Higher Frequency Filter 40–200Hz.
  • MID CONTROL: +/- 14dBs Cut/Boost with Frequency Sweep 100Hz – 2.5kHz.
  • TREBLE CONTROL: +/- 18dBs with internally Shelf Frequency 1kHz – 7.5kHz, Pull for Bright peaking at 10kHz.

Uni-Pre 3 Knob User Manual

Uni-Pre 4 Knob User Manual

Uni-Pre 5 Knob User Manual

3 Knob Layout



4 Knob Layout



5 Knob Layout

Customer Reviews

Based on 15 reviews
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B
Brent H.
Great preamp

After many years of waiting for the right opportunity, I finally got an East preamp and it does not disappoint. Everything I want in a preamp. Very happy with it.

R
Robert L.
The John East Uni- pre is amazing!!! This is the best onboard preamp I have ever put in a bass!

The John East Uni-pre is amazing!!! This is the best onboard preamp I have ever put in a bass!

This preamp has every option you can imagine available, there is nothing it doesn’t have as a feature, you can literally shape your tone in anyway you can think of.

I installed this in a Lakland 55-OS Bass, it was a tight fit, but it did fit, without needing to modify anything.

I paired this with Bartolini American Humbucking dual coil MK5CBC soap bar pick ups, and it’s a great combination!

I promise you, you will not find a preamp on the market as versatile as this one.

m
mathieu f.
Really great service

Had some problems installing it, the guys called me right away and guided me through. Amazing..

E
Edwin H.
Fantastic preamp

I installed this preamp in a 1991 Modulus TBX 6. It is equipped with Bartolini P4 pickups and I was thinking about swapping them out as they didn’t seem that clear and present. However, before I did that, I decided to change the preamp that came with the pickups to the East Uni. I am really glad that I did. The sound of the bass has just opened up in a fantastic way. My reason for selecting the Uni was to get the active blend. It makes such a difference to buffer each pickup before they get combined. John’s designs are always fantastic and this is no exception. I have yet to dig into the internal options, so much versatility! Highly recommended.

S
Scott S.
Pre=wired harness for a special-request preamp for a customer.

Max was fantastic. Very helpful and shipped the parts out immediately.

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