Alesis QuadraSynth

Alesis Quadrasynth Image

The QuadraSynth was introduced in 1993 by Alesis, and it was their first major synthesizer. It's a 64-voice, 76-key digital synthesizer that also came in a rack-mountable version: the S4 Sound Module. It had 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 QuadraSynth is undoubtedly a powerful and flexible synthesizer 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.

Released in 1995/1996 came the new and improved QuadraSynth Plus synthesizer. The QuadraSynth Plus has more ROM (24MB expandable to 32), many more program patches (640) and mixes (500). The General MIDI library has been added, as well as an 8MB stereo Grand Piano sample (also found in the stream-lined QS7, QS8, QS6.1, QS7.1, QS8.1 and QSR models), and a PCMCIA expansion slot. For an all around versatile modern synthesizer that isn't focused just on dance or trance, be sure to consider the QuadraSynths.

Lookup Alesis QuadraSynth Prices

The link above will take you to an eBay search for this synth to see active listings with more images, specs and information. If you don't find it there, try looking in our forum marketplace. Our marketplace gets thousands of visits every week so make sure to check back often if you want to buy or sell a synth.

Related forum topics


Are you looking to buy or sell a Alesis QuadraSynth? Post an ad in Gear For Sale or a request in Gear Wanted. For spare parts and repair services check out Gear Services & Other Goods. Our forums also has a Buyer’s Guide section where you can ask for advice on buying synthesizers.

32 Visitor comments
August 23, 2010 @ 4:36 pm
Superb keyboard for use in a band live, had mine from new for 14 years now and its gigged and used weekly and I've only just had to replace a few buttons that started to fail.
Good points - excellent, usable sounds, decent size keyboard with superb action, easy to set up massive patches with up to 16 sounds spread across the keyboard. Sounds are very 'real world', good pianos, brass, organs, strings, woodwind etc. Some other keyboards have amazing pads and synth washes which sound great in the shop but when can you use them? The Quadrasynth has some of these sounds but most sounds are really good useable every day sounds.
Editing sounds is complicated though, so I haven't bothered, the original patches are more than good enough. Its a very light keyboard for its size with a useful carry handle but is still well built. I've always been able to find the right sound from this keyboard for any track I'm doing! Try one......just listen to the built in demo!
June 1, 2010 @ 12:22 pm
the interface is extremely difficult to use, very nervous about using it onstage
May 17, 2010 @ 2:41 pm
Cheap and so powerful! IMHO it is one of the best and warm sounding digital synths ever. Very reliable. Gary Numan still uses 2 of them on stage for almost 17 years now!
March 18, 2010 @ 3:55 am
I had one of these and the Plus model. I loved the interface, still think it's the best I've ever used, could program any sound in seconds. It's biggest problem was it's blandness and fix-resonance filter. It did have quite a nice piano and one or two decent pads but ultimately I found it uninspiring. The newer 'QS' models had an improved ROM-set but sacrificed that nice screen.
K2K Koos
March 3, 2010 @ 6:06 am
I've had the original Quadrasynth since it was launched, although for a few years now it has been boxed up due to space constraints. Makes a nice master keyboard, has excellent sounds, and is distinctive, but not a great programming board due to tedious interface. Also the filter has no resonance, but there are resonant samples in there. Great as a scratchpad,but also much more, some sounds can really stand their ground even today.
VSE Rating

It’s Good

User Rating

Rated 3.19 (209 Votes)

  • Check Price
  • The link above will take you to an eBay search for this synth to see active listings. If you don't find it there, try looking in our forum marketplace or post a wanted classified.
  • Specifications
  • Polyphony - 64 voices
  • Oscillators - 48kHz Linear samples
    QS: 16MB, expandable to 24MB using PCMCIA ROM and RAM cards
    QS Plus: 24MB, expandable to 32MB using PCMCIA ROM and RAM cards
  • Multitimbral - 16 parts
  • Effects - 4 On-board effects, based on the Alesis QuadraVerb 2 FX processor
  • Arpeg/Seq - None
  • Keyboard - 76 velocity and aftertouch sensitive, semi-weighted, synth-action
  • Memory - QS: 128 preset 128 user programs, 100 preset, 100 user mixes
    QS Plus: 512 preset 128 user programs, 400 preset, 100 user mixes
  • Control - MIDI IN/OUT/THRU (16-channels)
  • Date Produced - 1993 (QuadraSynth)
    1995 (QuadraSynth Plus)
  • Resources & Credits
  • Images from

Errors or Corrections? Send them here.