Darkglass Luminal Booster Ultra Bass Preamp/Boost Pedal

£399.00

Also available on Andertons, Amazon, eBay & Reverb

Fresh on the menu for 2026 are the Darkglass Guitar Pedals, freshly added and carefully selected. These New units are available to order online with fast, secure delivery from trusted UK retailers. Read on for full details, specifications, demos, videos, reviews, and the best places to buy the Darkglass Guitar Pedals today.


Description

Fresh on the menu for 2026 are the Darkglass Guitar Pedals, freshly added and carefully selected. These New units are available to order online with fast, secure delivery from trusted UK retailers. Read on for full details, specifications, demos, videos, reviews, and the best places to buy the Darkglass Guitar Pedals today.

The Luminal Booster Ultra pedal combines the rich tone of the Harmonic Booster with the precision of an adjustable frequency range parallel compression, offering bass players unmatched control. Featuring a 6-band EQ, a gain reduction meter, and the ability to load 7 custom Impulse Responses (IRs) via USB, it provides ultimate tonal flexibility for any genre. Whether you’re seeking a clean tone or a more powerful sound, this pedal gives you the precision to perfect your bass tone.

Luminal Booster Ultra Modes

The Luminal Booster Ultra adds versatility by allowing users to change the order of the Compression and Harmonic Booster engines. By long-pressing the left footswitch, users can toggle between blue mode and red mode for different tonal and compression effects.

Darkglass Suite Integration

The Darkglass Suite (desktop app) lets you load available IRs from the Darkglass library or add your own custom or third-party impulse responses to the pedal. You can also control the headphone output levels directly through the software.

Key Controls & Features:

  • Filter: Adjustable lowpass filter for the compressed signal.
  • Blend: Blends between the clean and compressed signal.
  • Comp: Adjusts the amount of compression applied.
  • Level: Adjusts the level of compression after the blend control.
  • Boost: +-20dB boost or cut.
  • Character: Blends in tone-shaping circuitry and allows selection between 7 IRs.
  • Mid Gain: +-20dB adjustment at the frequency selected by the Mid Frequency.
  • Mid Frequency: Adjustable from 250Hz to 2.5kHz.
  • Master: Sets the overall volume of the unit with +-12dB adjustment.
  • Bass: Low shelf, +-13dB at 80Hz.
  • Mid Bands: Adjusts mid-range frequencies with +-13dB at 250Hz, 500Hz, 1.5kHz, 3kHz.
  • Treble: High shelf, +-13dB at 5kHz.

Specifications

  • Dimensions:
    • Width: 125 mm (5 inches)
    • Length: 96 mm (3¾ inches)
    • Height: 57 mm (2¼ inches)
    • Weight: 430g (0.95 lb)
  • Power:
    • The pedal requires a 9V DC regulated adapter with a center-negative plug.
    • The unit draws 400mA.
    • Warning: Using an unregulated power supply or higher voltages may result in noise issues or damage, voiding the warranty.

Input & Output Options:

  • Input: Connect your instrument or pedalboard output to the ¼” mono jack.

  • Aux Input:

    • 3.5mm stereo input to practice with backing tracks from devices like smartphones or laptops. The volume level must be controlled from the source device, and it works only with the headphone output.
  • Headphone Output:

    • Internal stereo headphone amplifier capable of driving a minimum load of 16 ohms through the 3.5mm stereo jack. Use the Master volume control to adjust the headphone level.
  • Output:

    • Connect from the ¼” output jack to the amplifier or other effects pedals.
  • Direct Output:

    • Balanced XLR output for connecting to preamps, PA systems, etc.
  • Ground Lift:

    • Disconnects the signal ground on the Direct Output to reduce noise by breaking any ground loops.
  • Cab Sim:

    • Select between 7 cabinet simulations for the XLR output, accessible via the Character knob.
  • USB:

    • A USB-C connector allows you to load cabinet simulations (IRs) and control various settings via PC or Mac.

Cabinet Simulations (Cabsims)

Choose from a wide range of cabinet simulations, including but not limited to:

  • Analog Cabinet
  • Black and White 410
  • Cali 212
  • Cali 410 NEO
  • Cali Combo 212
  • Dave 410
  • DG112N
  • DG212N
  • DG410N
  • DG412ES
  • DG810ES
  • Fashionista 412
  • Forrester 810
  • Fruity 115
  • Fruity 212
  • Fruity 410
  • Fruity 810
  • Garden118
  • Garden 410
  • London 412
  • London 412 Vintage
  • Modern 212
  • Modern 412
  • Modern 115 Powerplant
  • Modern 210 Powerplant
  • Modern 410 Powerplant
  • Modern 810 Powerplant
  • Mountainino 610
  • Nolly 810
  • Panzer 412
  • Peggy 115
  • Peggy 210
  • Peggy 410
  • Peggy 810
  • Peggy 810 Vintage
  • Snakeskin
  • Stockman 212
  • Stockman 410
  • Stockman 810
  • Swirl 115
  • Swirl 410
  • Swirl 810
  • Topper

These options offer an extensive range of tonal versatility, allowing bass players to explore a variety of sounds and effects.

Additional information

Weight 0.5 kg

Brand

Darkglass

Darkglass Electronics is renowned for modern bass tone with precision, punch, and serious low-end authority. Built in Finland and trusted by players across metal, rock, and progressive styles, their pedals and amps focus on tight response, articulate mids, and controlled saturation that enhances rather than muddies your sound.

Choose Darkglass when you want clarity and aggression working together. From subtle harmonic enhancement to full-on driven bass grind, their gear delivers studio-ready definition and powerful presence — keeping your low end focused, dynamic, and unmistakably modern.

Category

Guitar Pedals

Tags

Boost

A boost pedal does one simple thing brilliantly — it makes your signal louder, stronger, and more alive. Whether you’re pushing a valve amp into natural breakup, lifting a solo above the band, or adding a touch more presence to your core tone, a clean boost gives you extra headroom without changing your character.

Use it at the front of your chain to drive other pedals harder, or after your gain stages to raise volume without adding distortion. Subtle or powerful, transparent or slightly coloured, a boost is one of the most useful tools on any pedalboard — small box, big difference.

Cab Sim

A cab sim pedal recreates the sound of a miked guitar speaker cabinet, allowing you to run direct without losing that crucial speaker character. While amp sims shape the amplifier tone, a cab sim captures the warmth, roll-off, and natural resonance of a real cabinet and speaker. Plug straight into a PA, recording interface, or headphones and still get a finished, mix-ready sound.

Use a cab sim for silent stages, late-night recording, or streamlined boards where carrying a cabinet simply isn’t practical. It’s the final seasoning in a direct rig — smoothing harsh highs, tightening the low end, and delivering that authentic “amp in the room” feel without the actual room.

Compressor

A compressor pedal evens out your dynamics, smoothing peaks and lifting quieter notes so everything feels tighter and more controlled. It adds sustain, clarity, and balance — making clean chords ring longer, country licks snap with precision, and funk rhythms pop with consistency. Subtle or pronounced, compression shapes the feel of your playing as much as the sound.

Use it at the front of your chain to tighten your core tone, add sustain to leads, or keep complex passages sitting neatly in the mix. From gentle polish to unmistakable squash, a compressor is one of those foundational tools that quietly makes everything sound more professional and dialled in.

EQ

While Ed Sheeran primarily relies on the natural sound of his acoustic guitar and vocals, he occasionally uses EQ (Equalization) to shape and enhance his tone during live performances or in the studio. EQ pedals or onboard preamps can allow him to adjust the frequency response of his guitar signal to suit the acoustics of different venues or to achieve specific tonal characteristics. Here’s how EQ might be utilized in Ed Sheeran’s setup:

1. **Tonal Shaping**: EQ can be used to adjust the balance of frequencies in the guitar signal, allowing Ed Sheeran to shape his tone to his liking. For example, he might boost the midrange frequencies to bring out the warmth and presence of his acoustic guitar, or cut certain frequencies to reduce any harshness or mud in the sound.

2. **Feedback Control**: In a live setting, EQ can help control feedback by notching out problematic frequencies that might cause the guitar signal to feed back through the amplification system. This can be particularly useful when performing in venues with challenging acoustics or high volume levels.

3. **Room Correction**: In situations where the venue’s acoustics are less than ideal, EQ can be used to compensate for any deficiencies in the sound. By adjusting the EQ settings, Ed Sheeran can tailor the guitar tone to sound more balanced and natural, regardless of the room’s acoustic properties.

4. **Matching Gear**: EQ can also be used to match the tone of Ed Sheeran’s guitar to the sound of other instruments or equipment in his setup. For example, he might adjust the EQ to complement the tonal characteristics of his vocal microphone or to blend seamlessly with backing tracks or other instruments.

Overall, while EQ may not be a central component of Ed Sheeran’s guitar effects setup, it can still play a valuable role in shaping his tone and ensuring that he achieves the desired sound in different performance environments. Whether used subtly for tonal shaping or more aggressively for feedback control, EQ allows Ed Sheeran to tailor his guitar tone to suit his musical vision and performance needs.

Filter

A filter pedal shapes your tone by emphasising or cutting specific frequencies, letting you sculpt everything from subtle tonal shifts to bold, sweeping textures. Unlike traditional wah or envelope effects, filters can be static or controlled in different ways, giving you focused control over how bright, dark, sharp, or resonant your sound becomes.

Use a filter to tighten the low end, tame harsh highs, or create synth-like sweeps and rhythmic movement. Whether you’re refining your core tone or pushing into experimental territory, a filter pedal gives you precise control over the flavour of your sound.

New

This is brand new, fresh in, and a UK warranty is included. New Gear always comes from trusted UK music retailers.

Preamp

A preamp pedal shapes and boosts your guitar’s signal before it reaches your amp or recording interface, giving you control over tone, gain, and headroom. It acts as the first stage of amplification, adding warmth, clarity, and character while preparing your signal for the next part of the chain. Some preamps emulate the response of classic valve circuits, while others offer clean, transparent tone shaping ideal for acoustic instruments or direct recording setups.

Used on its own, a preamp pedal can serve as the foundation of your tone, providing a consistent core sound wherever you play. When combined with other effects, it enhances dynamics and helps each pedal sound more defined and natural. Whether you’re looking to push your amp harder, bring life to a dull signal, or refine your sound for the studio, a good preamp pedal adds presence, punch, and musicality to any rig.

Volume

Volume pedals control the output level of a guitar signal using a foot-operated treadle. They allow smooth volume swells, dynamic control during playing, and easy muting between songs. Volume pedals can be placed at different points in the signal chain to either control overall loudness or adjust gain and drive behaviour when positioned before distortion or overdrive pedals.