Alesis Quadraverb (1989)

Name: Alesis Quadraverb
Brand: Alesis

1U rackmount digital multi-effects processor with simultaneous reverb, delay, EQ, and pitch effects, introduced in 1989.

Overview

The Alesis Quadraverb is a digital multi-effects processor developed by Alesis following the success of their Midiverb and Microverb units. Debuting in 1989, it was marketed as Alesis' first programmable reverb and offered four simultaneous effects: reverb, delay, equalisation, and pitch processing. It features 100 user-programmable memories and 90 factory presets, with real-time MIDI control over up to eight effect parameters. The unit supports five distinct signal chain configurations, allowing flexible routing of effects such as Plate, Room, Chamber, Hall, and Reverse reverb types, along with chorus, flanging, detune, and multiple EQ modes.

Specifications

Year	1989
Manufacturer	Alesis
Format	1U rack
Effects	Reverb, delay, chorus, flanging, pitch detuning, EQ
Processing	16-bit linear, 24-bit internal
Dynamic Range	85dB
Frequency Response	16Hz–20kHz
Memory	100 user, 90 factory
Display	16x2 LCD with orange LED backlight
Inputs/Outputs	Stereo unbalanced 1/4" jacks (high-impedance)
MIDI	In, Thru
Power	External power supply
Construction	Black finish, made in USA

Design

The Quadraverb uses a microprocessor-based design with a custom VLSI chip enabling 16-bit resolution and 24-bit processing. It supports five configurations that define the internal signal path, including QuadMode (EQ > Pitch > Delay > Reverb) and specialized chains for Leslie simulation or graphic EQ. The front panel includes a backlit 16x2 LCD and solid plastic buttons that accelerate parameter scrolling with increased pressure. The unit contains an internal battery and is built around a fully programmable architecture allowing deep editing of all major effect parameters.

Context

Introduced in 1989, the Quadraverb arrived during a surge in multi-effects processors, alongside units like the ART Multiverb, Yamaha SPX1000, and Digitech DSP 128P. It followed Alesis' award-winning Midiverb II (1987) and expanded on earlier designs by offering full programmability and four simultaneous effects. Competitors included Roland's DEP series and upcoming models from Korg and Yamaha. The Quadraverb Plus later emerged with enhanced firmware, including tap tempo, while retaining the same hardware.

Market

As of 2026, used Alesis Quadraverbs sell for approximately $242.25. Units in known working condition were valued around $100 in 2007. Common failures include dead or dim LCDs due to failed driver ICs, leaky capacitors, or burnt-out orange LED backlights. The internal battery should be replaced in older units, and the power switch may require cleaning. Replacement parts like the L1672B1J LCD module exist but have historically been expensive.