Alesis S4 Quadrasynth 90's Polyphonic 1U Rack Mount Synthesiser Sound Module

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  • Regular price $389.00

Alesis S4 Quadrasynth 90's Polyphonic 1U Rack Mount Synthesiser Sound Module

The S4 is the rack-mount version of the QuadraSynth. It's a 64-voice digital synthesizer with a whopping 16 MB of sample ROM, and was the first synth to offer the ADAT Optical Digital interface. It also featured the same multi-effects processor as the QuadraVerb 2, drum kits based on the D4 drum module, 4 assignable control knobs, one PCMCIA card slot, 48kHz clock input, and 4 audio outputs.

The S4 is undoubtedly a powerful and flexible synthesiser capable of creating rich sounds - both acoustic and electronic. It uses digital additive/subtractive sample playback synthesis to create high quality stereo grand pianos, organs, strings, drums/percussion, brass, woodwinds, new and classic synth textures, and more. (Vintage Synth Explorer)


• This unit has been used. 

• This unit has been thoroughly tested and everything is working as it should.

• This unit shows some minor wear from use and age. Nothing major at all. Please see all photos. 

• This S4 has a small darker patch on the screen, however it doesn't seem to affect its legibility. Please see photos for further details. 

• The Alesis uses a 9V AC power adaptor. This adaptor will only be included for Australian & New Zealand buyers. 

• Overseas buyers will need to source their own power supply. Please get in touch if you need help sourcing the correct item. 

• This sale S4 unit only. Nothing else is included unless specified above. 


Polyphony - 64 voices
Oscillators - 48kHz Linear samples
S4: 16MB, expandable to 24MB using PCMCIA ROM and RAM cards
S4 Plus: 20MB, expandable to 28MB using PCMCIA ROM and RAM cards (no cards included)
Multitimbral - 16 parts
Effects - 4 On-board effects, based on the Alesis QuadraVerb 2 FX processor
Arpeg/Seq - None
Keyboard - None
Memory - S4: 128 preset 128 user programs, 100 preset, 100 user mixes
Control - MIDI IN/OUT/THRU (16-channels)
Date Produced - 1993 (S4)


If you are in a remote area you may incur extra fees. 

International import tax, duty, vat, custom fees or any other charges are not covered by us, nor included in the shipping fees. These are the responsibility of the buyer. 

Return Policy:

Returns will only be accepted for manufacture defects / faulty items. Please contact us if you have any problems with your purchase and we will strive to work it out with you.

Please contact us with any enquiries, and check our store for more serviced pro audio ge