Siel DK700

Siel DK700 Image

The DK700 is a polyphonic synthesizer with voice assignment. It actually contains 6 complete and individual synth modules (termed voices or channels). It is fully programmable and able to store up to 73 programs in its memory when in DK700 mode and 55 patches for the simultaneous control of slaves when in master keyboard mode. Each voice contains two digitally controlled oscillators (to ensure the best pitch reliability on the whole extension of the wall tempered scale) with analog waveforms. It also comprises a 24 dB/octave low pass Voltage-controlled filter and an envelope generator; this means that the DK700 has 12 oscillators, 6 filters, 6 envelope generators and 4 low frequency oscillators providing parallel modulations of parameters such as pitches, square waves P.W., filters. All this is controlled by specific controls and memorized in the heart of the DK700; the "Programming Unit", which also provides to the management of the 73 timbric programs and 55 patches.

The DK700 is basically an updated version of the Siel Opera 6 with added midi-functions. It's quite rare and could be regarded as one of the best Siel ever built. Unlike the DK70/80, the DK700 has six filters and three LFOs to shape your sounds. Once you edited the sound you had in mind, there are plenty of memory patches to store it. This synth has a fat tone even without using a Chorus-unit. The sounds are very versatile and analogue. From synth-horns to weird effects, the Siel does it all with ease.

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9 Visitor comments
April 29, 2011 @ 5:23 am
There is a link to the DK600 schematics here: near the bottom of the page.

The DK700 uses the same CPU and Voice boards, with one or two components left out. It adds a MICRO board with a second processor for the master keyboard functions.
March 30, 2011 @ 1:50 pm
Desperately need full schemos for a DK700, I hope that one will be available soon, if so please keep me posted. I'll check this page often. Thanks!
Malcolm Elijah
February 7, 2011 @ 2:30 pm
I just purchased one of these that I knew needed some work. Turns out the battery for the memory is prone to spilling the corrosive acids onto the board and ruining components. If anyone knows where to find a schematic to bring this beast back to life, please contact me:

If I get this working I will post higher res photos, sound samples, demo vids, etc. These are so rare and there is very little info I can find on them. There is not even any history of finished auctions for them on eBay. My serial number is No. 32!!!
gino wong
April 8, 2010 @ 10:07 am
This is the best Siel unit I have ever used. It is solid, more metal than plastic and is a reasonable size and weight for a master controller of it's vintage. I have used it alongside an SG1D when I need to do modulation and bends the layout of the Siel is superior. It is a good synth that is not stuck in the 80s in terms of programmable sounds, it makes good timeless sounds both pitched and unpitched. It is not the easiest synth to work with, you need the manual. However it is really a good instrument.
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  • 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.
  • Demos & Media
  • Manual - Download the original owner's manual from

  • Specifications
  • Polyphony - 6 voices
  • Oscillators - 2 DCOs per voice
  • Filter - Six; 24 dB/octave low pass Voltage-controlled resonant filter
  • Envelopes - Six Envelope Generators (ADSR)
  • LFO - 3; 1+2 for DCO & 3 for filter
  • Keyboard - 61 keys (velocity sensitive)
  • Memory - 73 patches
  • Control - MIDI
  • Date Produced - 1986

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