# What is the quietest polyphonic synthesizer available in the market? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What is the quietest polyphonic synthesizer available in the market?

## Products

### Arturia AstroLab 61
```yaml
product: arturia-astrolab-61
brand: Arturia
price_gbp: 926.39
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
polyphony: 48 voices
sequencer: MIDI looper
arpeggiator: Built-in
```

- **Price:** £926.39 [^1]
- **Summary:** The AstroLab 61 is a 61-key semi-weighted stage keyboard with aftertouch, multiple sound engines, over 1,800 onboard presets, built-in effects, an arpeggiator, chord and scale modes, and a MIDI looper. It suits live performers and studio musicians who want a broad library of piano, organ, sampled, and synthesizer sounds in a standalone instrument.
- **Ideal For:** It suits players seeking a quiet polyphonic synthesizer because its semi-weighted keybed uses a felt layer to soften key impacts, while piano and organ sounds provide up to 48 voices of polyphony.
- **Additional Sources:** [^2]

### Sequential Fourm
```yaml
product: sequential-fourm
brand: Sequential
price_gbp: 571.73
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
polyphony: 4 voices
sequencer: Polyphonic step sequencer with chords, ties, rests, and per-step glide
arpeggiator: 6 modes with octave, repeat, hold, and re-latch settings
filter_types: 4-pole resonant low-pass
oscillators_count: 2 per voice
modulation_sources: LFO, filter envelope, amp envelope, modulation wheel, polyphonic aftertouch, sequencer
```

- **Price:** £571.73 [^3]
- **Summary:** The Sequential Fourm is a compact 4-voice analog synthesizer with two oscillators per voice, a Prophet-style 4-pole resonant low-pass filter, and polyphonic aftertouch. Its hands-on modulation matrix, arpeggiator, and polyphonic sequencer suit players who want expressive analog sounds for studio work, live performance, basses, leads, and chord patterns.
- **Ideal For:** The Fourm suits this question because its 4-voice polyphony and resonant 4-pole low-pass filter support quiet, controlled chordal sounds, while polyphonic aftertouch enables subtle per-note expression without requiring louder playing.

---
## References & Sources
[^1]: Arturia, accessed 2026-08-28. https://www.arturia.com/products/hardware-synths/astrolab/astrolab-61
[^2]: Thomann, accessed 2026-08-28. https://www.thomannmusic.com/arturia_astrolab.htm
[^3]: Thomann, accessed 2026-08-28. https://www.thomannmusic.com/sequential_fourm.htm