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Siel Opera 6

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Page last updated Mar 31, 2026

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Description

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The Siel Opera 6 is a vintage analog synthesizer that has captured the hearts of musicians and synth enthusiasts alike. Originally released in the early 1980s, this iconic instrument is renowned for its warm, lush sounds and SSM filter chips, which contribute to its unique sonic character. With its polyphonic capabilities and intuitive control panel, the Opera 6 is designed for both stage and studio use, offering a wide range of sound-shaping possibilities.

Equipped with a 61-key keyboard, the Siel Opera 6 allows for expressive playing and is perfect for those seeking to explore the depths of analog synthesis. Its six-voice polyphony ensures that complex chords and intricate melodies sound rich and full. This synth features a user-friendly interface with dedicated controls for each major function, making it easy to tweak your sounds on the fly.

Whether you're crafting ambient soundscapes or punchy basslines, the Siel Opera 6 delivers versatile performance with its dual oscillators and extensive modulation options. Its vintage appeal and classic design make it not just an instrument, but a piece of synthesizer history that continues to inspire musicians today.

Key Features:

61-key keyboard for expressive performance
SSM filter chips for distinctive analog sound
Six-voice polyphony for complex chord structures
Dual oscillators for rich, textured sound creation
Dedicated controls for intuitive sound shaping
Built-in modulation options for dynamic sound design

Videos

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No Nag

Siel opera 6

No Nag

Siel Opera 6, Ensoniq DP/4+, Arturia Beatstep

No Nag

Smooth 80's Brass design on Siel Opera 6

Valmont

Siel Opera 6 Demo - vintage synthesizer demonstration for AllSynth.com

JAKSPIN

SIEL OPERA 6 // playing some sounds for friend // SOUND of SSM

LESINDES

Siel Opéra 6

arnaud houpert

Reviews

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Siel Opera 6.

Build quality

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Known for being flimsy compared to Japanese and American counterparts, though it offers impressive sound quality.
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The Siel Opera 6 reportedly has one of the worst keybeds among synths, prompting some owners to consider swapping in a Fatar TP/9 for improved playability.
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Setup and maintenance

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Reloading factory patches can be challenging; ensuring they work may solve sound issues.
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Comparisons

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More expensive than the Juno 60 at launch, offering more features but lacking in build quality.
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Fatar TP/9 keybeds, found in modern Sequential synths, are often preferred over the Siel Opera 6’s, which is described as having poor feel and response.
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Use cases and applications

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Offers thin and icy sounds, ideal for layering with other synthesizers.
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Value and pricing

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A non-working unit priced at 200€ could still be profitable, given working units often sell for around 700€.
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Mods and upgrades

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Some users are considering installing a Fatar TP/9 keybed in their frequently used synths like the Polysix and possibly the Siel Opera 6 for better performance.
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