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John East Uni-Pre 2-Pickup 4-Knob 3-Band Vol/Bl Stack - Treb/Bass Stack - Mid/Mid Stack - Tone P/P A/P

SKU:Uni-Pre 4-Knob

Details:

  • 3-band: 2-pickup, 4-knob
  • Volume/Blend Stack - Treb/Bass Stack - Mid/Mid Freq Stack - Passive Tone (A/P Push-Pull)
$325.00 - $350.00
$325.00 - $350.00

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DESCRIPTION

Uni-Pre 4 Knob

2 Pickup, 4-knob

  1. Volume/Blend Stack
  2. Treble/Bass Stack
  3. Midrange/Midrange Freq. Stack
  4. Passive Tone (Push/Pull for Active/Passive)

The Uni-Pre 4 Knob 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 knobs with rear cavity electronics.

It also requires a toggle for active/passive switching.

Its main components are a Volume/Blend module and EQ.

The Volume/Blend has totally independent dual active and passive signal paths, controlled simultaneously with a conventional knob set.

The EQ module allows internal voicing adjustment for the treble as well as the lower and upper bass frequencies.

This is in order to allow finely tuned focus on the most crucial bass spectrum.

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.

The potentiometers have 10.0mm threaded bushings designed for rear cavity mounting in the bass. Flat wire connections to the potentiometers and toggle switch allow for a flexible layout.

The preamp comes fully wired including battery clip and Switchcraft jack.

For ease of installation, pickups are connected via screw terminals.

A ground wire will need to be connected to grounding points such as the bridge and any internal shielding.

Out of the box, just connect the pickups using the screw terminals, snap in a battery, and you'll get sound.

Features

  • 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 adjustments 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.
  • Reviews

    Rate and Review this item
    Verified Buyer
    Worth every penny!
    By Keith F. Kelly from on 7/20/2016
     
    I've done my own maintenance and upgrades on all my own basses for years. I have a Schecter Stiletto Custom-4 that came with those commonly-found crummy passive EMG-HZ pickups and the equally crummy EMG digital preamp circuit. Shortly after purchasing it, I replaced the innards with Delano pickups and a BassMods preamp (which was recommended as a cheap-but-good preamp option in the TalkBass forums). The pickups I love, but the preamp was always a mess of problems; the BassMods preamps use low-quality wiring and potentiometers susceptible to noise and interference, and the preamp "brain" itself is giant sealed black box nearly the size of a a soapbar pickup. The preamp was so awful that I ended up setting that bass aside and never gigging with it -- which is a shame, because it's a great instrument and the Delano pickups are fantastic. So recently I finally decided to suck up the high price and buy this John East preamp to install instead... and WOW, what a world of different in terms of quality! This preamp is compact, well-thought-out, and very easy to install, and comprised of very high-quality components that function exactly as you would expect. Now I can gig with this bass again and depend on it!
    Verified Buyer
    great preamp.
    By the mauler from on 2/9/2016
     
    This is a top notch preamp. I am enjoying the new possibilities it grants me and this bass. Installation is very simple. I recommend you use copper foil/tape to shield/ ground your instrument- and don't lose the jumpers!
    This unit sounds clean, quiet, and it's operation is very smooth. It gives the bass an exciting tone and sparkle without changing the overall tone and feel of the bass much.
    The EQ is voiced where I like it. I love the bass control's restraint. It gets big big big, but doesn't overpower the other frequencies or the tone of the bass itself. The bright pull is voiced ideally for that top sizzle without having to crank up all the highs in order to get it. Very slick. The high is high, not high-mid, if you know what I mean. I like that.
    I got the mid sweep, too, which is also very quiet, clean, and voiced for pretty much all of our needs. it can pump the low mids for a punchy motown groove or cut the high mids for a contemporary slap sound. Plus, at center, the mid control is neutral. The midsweep is worth getting, in my opinion. Most preamps offer a fixed or switchable mid frequency. This is design offers more flexibility.
    A cool feature of this preamp is that you can use the trimpots to gain up or down each pickup individually. This allows you to make the bass hotter, but also to balance the output of each pickup. This is a great feature for my bass, which has mismatched pickup outputs. However, this feature is bypassed in passive mode, which is another reason I'll not use passive mode unless the battery dies.
    I usually play passive, but this preamp doesn't really support passive mode. The passive mode works fine (even with no power, if your battery dies!) and sounds good/clean, etc. But the active/passive modes are very different in gain/volume. You can't go from passive to active on the bandstand without a major change in gain. Even with the trimpots at the lowest setting, the active mode is hotter than passive. I'll only use the passive mode when the battery dies.