Alesis Microverb II (1988)
A 16-bit stereo digital reverb processor released in 1988 with 16 non-editable presets and solid metal construction.
Overview
The Alesis Microverb II is a compact, all-digital reverb processor released in 1988 as an affordable effects unit for home and live use. It features 16 internal stereo reverb programs and is housed in a durable grey metal case with a one-third rack width design. Intended for keyboardists, guitarists, and vocalists, it delivers a characterful, gritty reverb sound often described as bright and boxy at high mix levels but surprisingly transparent when used subtly. The unit lacks MIDI and a discrete power switch, relying on an external 9V AC adapter connected via a 3.5mm jack.
Specifications
| Production Year | 1988 |
| Bit Depth | 16-bit |
| Presets | 16 non-editable internal programs |
| Inputs/Outputs | 1/4" mono input, 1/4" stereo outputs |
| Power | 9V AC adapter, 3.5mm audio-style jack |
| Dimensions | 1.75" H × 8.5" W × 6" D |
| Weight | 2.5 lbs |
| Bandwidth | 15kHz |
| Dynamic Range | 90dB |
| Processor | Proprietary Alesis R.I.S.C. architecture |
Design
The Microverb II uses solid metal construction with side fins that allow three units to be slotted together for 19" rack mounting. It contains a single DSP chip developed by Alesis, shared with the Midiverb, and features a 16-position rotary encoder and three smooth potentiometers for control. The tri-color LED serves as an input level indicator (green=good, yellow=high, red=distorting). The power circuit includes GL7805, GL7812, and LM7912CT voltage regulators, along with 1n4002 diodes. It is powered by an external PSU containing only a transformer and has no internal power switch.
Context
The Microverb II was positioned as an entry-level, budget-friendly reverb unit in Alesis' lineup, offering a simplified version of the MIDIverb without MIDI control. It succeeded the original 1986 Microverb and preceded the Microverb III (1991) and Microverb 4 (1996), with the Nanoverb (1996) considered its real successor. Marketed to bedroom producers and live performers, it became a popular choice for adding reverb to drums, vocals, and guitars in the late '80s and early '90s.
Market
Common issues include scratchy potentiometers, failing rotary encoders, and failure of the original wall-wart power supply, which can be difficult to replace. Capacitors, voltage regulators, and solder joints are also known failure points, though spare parts like encoders, pots, and power supplies remain available. Units are frequently found in storage, often either well-worn or in mint condition with original packaging.
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