DARKGLASS LUMINAL ULTRA BOOSTER - PREAMP DI

A Pedal Designed as a Modern "Channel Strip" for Demanding Bassists

The Darkglass Luminal Booster Ultra embodies a very contemporary approach to bass tone: achieving a signal that is simultaneously powerful, clean, and controlled without sacrificing the instrument's character. Its concept combines the warmth and presence of a harmonic boost with the precision of an adjustable parallel compression to preserve attack and natural playing while thickening sustain and note hold. Add a 6-band equalizer and IR management, and you get a pedal capable of replacing several links in a chain (boost, compressor, equalization, and cab sim finishing) in a pedalboard-friendly format.

Who It's For and Which Styles the Luminal Booster Ultra Excels In

This pedal is aimed at bassists who want a mix-ready sound that remains consistent from track to track. In rock and metal, it helps maintain a solid low end and clear attack, even with aggressive playing or low tunings. In funk, pop, or gospel, the parallel compression provides fine dynamic control while allowing transients to breathe-ideal for ghost notes and right-hand nuances. In the studio, the 6-band equalizer and gain reduction indicator speed up dialing in your tone: you adjust what you hear and immediately see what you're compressing.

On stage, the Luminal Booster Ultra becomes a simple solution to stabilize levels, enhance presence, and adapt the sound to the PA system thanks to the IRs. It's also an excellent choice if you switch between multiple basses: a passive bass can gain density and definition, while an active bass can be refocused to sit perfectly in the mix.

Controls, Modes, and Integration: Flexibility Designed for the Pedalboard

The Luminal Booster Ultra emphasizes control and ergonomics. The 6-band graphic equalizer allows quick correction of resonances, cutting intrusive low-mids or adding attack without relying on approximate settings. The parallel compressor (with adjustable frequency) helps target the spectral area that triggers compression-a major advantage for maintaining a full low end while controlling peaks and snap.

The pedal also offers a "studio"-oriented operating logic with its gain reduction indicator, very useful to avoid over-compression. Regarding modes, a long press on the left footswitch switches the order of the two engines (compression and harmonic boost): you then activate either blue mode or red mode. In practice, reversing the order changes the feel under your fingers: depending on your instrument and playing style, you can favor a tighter, more controlled response or a more open, harmonic tone.

Finally, the USB C port allows connecting the pedal to a computer to load IRs and manage various parameters via the dedicated app. You can notably load impulses from a library or import your own files (including third-party) to match your favorite cab, album sound, or a more modern aesthetic. The app also lets you control the headphone output level, handy for silent practice while maintaining a polished sound.

Sound Character

The Luminal Booster Ultra's sonic signature lies at the intersection of purity and power: the harmonic boost adds presence and musical definition, while the parallel compression provides subtle "glue" without crushing dynamics when properly set. The result can range from a very transparent sound (just more stable, denser, and clearer) to a more colored tone by adjusting the equalization and treatment intensity.

It responds particularly well to right-hand dynamics: playing harder, you'll feel the compression tame peaks while letting the energy of your playing come through, improving consistency and clarity in the mix. With suitable IRs, the final output gains coherence and "finish," as if your chain included a studio-style post-processing stage-ideal for direct recording or amp-less setups.

Technical specifications

Effects	EQ, Bass, Boost, Compressor	EQ	6 channels
Technology	Digital	Type	sector
Format	Pedal	Use	electric bass
Cabinet Simulator	7	Color	Black

Blue mode / red mode	engine order change (compression / booster) via long press on left footswitch	Weight	430 g
USB C port	PC/Mac connection for loading impulse responses and adjusting various parameters	Required power supply	9V DC center negative
Dimensions	125 x 96 x 57 mm	Current consumption	400 mA