Siel DK600

Siel DK600 Image


The DK600 is Siel's unique Italian take on the mid-eighties programmable polysynth with MIDI implementation (badged as the Opera-6 in the UK). Just like the Juno-106 and Poly-61 of the time, the Siel was a 6 voice synthesizer with straight forward programming, simple effects and digitally controlled analog oscillators (DCO's). However, the Siel, having dual oscillators per voice sounds thicker than the Juno or Matrix because it's got 12 oscillators! And because they're DCO's, you know they'll always remain stable and in-tune even though they are analog in nature.

The DK600 has many other nice features such as complete MIDI implementation. There are 3 LFO's for extreme modulation. Both the filter and amplifier have standard ADSR envelope sections. And like similar synths, all the sliders and buttons are intuitively placed on the front panel for hands-on real-time programming.

Siel Expander Image

EK-600 Expander

The EX600 Expander module was also released (pictured above), featuring the same great internal synth engine as the DK600. However, the Expander is not programmable except from a DK600, an external MIDI sequencer or editor such as Unisyn. The Expander was intended to be programmed by transferring patches from the keyboard version. It's not rack-mountable either so it's usually best to go for the keyboard version. After all, the keyboard features the great layout of controls, velocity sensitivity and 61 notes (5 octaves)!

Lookup Siel DK600 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.

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Are you looking to buy or sell a Siel DK600? 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.

17 Visitor comments
Nathan Stanley
October 26, 2011 @ 4:43 pm
Hi Josh, is it still for sale? Where are you located?
Josh Lange
August 3, 2011 @ 5:15 pm
I have this synth, looking to sell it.
July 8, 2011 @ 8:19 pm
I own the Expander module--love it big time- but I had a flood in the basement--away went my manual..where could I pick up another??any suggestions welcome
Alex E
June 30, 2011 @ 10:28 pm
If you find one, grab it. Even if it's not working, pick it up and service it. (Watch out for Ni-Cad battery leaks, though.) You do not see these very often; only about 2,000 were reportedly made. And it gives similar programmable synthesizers from the era a very good run for their money.
It sounds kind of brassy, classy and maybe a little aggressive too. The filter is incredible. Same awesome SSM2044 filter found in the Polysix. Not a super thick sounding synth or anything, but great nonetheless! The person below compared the sound to a JX-3p, and I'd say that's a pretty fair assessment.
Jim Wicked
July 23, 2010 @ 6:16 pm
I just got one of these in the mail today. The SSM filter really shines on this thing. It can get very JX3P-ish/low-level Jupiter sounding. It's limited, but there's still a lot of room to maneuver within its limits, and surprisingly, LFO 1 can go audio-rate so some form of FM is possible. The only thing I wish it had was sync capability, then I would be happier than a pig in the White House. Other than that, it isn't too shabby!
VSE Rating

It’s Good

User Rating

Rated 3.58 (159 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 - 6 voices
  • Oscillators - 2 DCO's per voice for 12 total
  • LFO - 3 LFO's
  • Filter - SSM analog with resonance and ADSR
  • VCA - ADSR
  • Keyboard - 61 notes with velocity
  • Memory - 95 programs
  • Control - MIDI
  • Date Produced - 1984-85

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