Dave Smith Instruments Mopho x4 (2013–2018)
A 4-voice analog synthesizer with 44-key semi-weighted keyboard, produced from 2013 to 2018
Overview
The Dave Smith Instruments Mopho x4 is a polyphonic analog synthesizer featuring four voices and a 44-key semi-weighted keyboard. Built with a 100% analog signal path, it delivers rich, warm tones suitable for both studio and live use. Each voice includes two analog oscillators and two sub-octave generators, contributing to its thick sonic character. The synth was introduced in 2012 and officially produced from 2013 to 2018, after which it was discontinued.
Specifications
| Polyphony | 4-voice |
| Oscillators | 2 analog oscillators per voice, 2 sub-octave generators per voice |
| Filter | Lowpass filter |
| Envelopes | 3 x 5-stage envelope generators |
| LFOs | 4 LFOs |
| Arpeggiator | Relatchable arpeggiator |
| Keyboard | 44-key semi-weighted |
| Signal Path | 100% analog |
| Dimensions (W×D×H) | 640 mm × 282 mm × 91 mm (25.2″ × 11.1″ × 3.6″) |
| Weight | 6.2 kg (13.5 lbs) |
| Original Price | C$1,399.99 |
| Production Years | 2013–2018 |
Design
The Mopho x4 is derived from earlier Dave Smith Instruments models including the Mopho, Tetra, and Prophet '08, sharing design and synthesis architecture across the product line. It features a fully analog signal path with oscillators and filter placed in the lower-right section of the panel. Known for its oscillator and filter bleed, the synth exhibits a characteristic analog warmth, though some users note the filter does not completely close.
Context
Introduced in August 2012 and produced through 2018, the Mopho x4 filled a niche for an affordable, compact polyphonic analog synth with professional-grade sound. It was positioned as a performance and studio instrument, praised for its durability, sound quality, and value. The model was discontinued by 2019.
Market
The Mopho x4 has been listed at prices around $600 in standard market tiers, with earlier listings showing $690 in 2013. Units in excellent condition are reported to work perfectly, though some users have noted the filter’s inability to fully close as a known behavior. Replacement parts and service information remain limited.
eBay Listings
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