AMSynths 2500
A Eurorack module reviving ARP’s rare 1005 filter and ring mod/VCA circuitry
Overview
Despite the name, the AMSynths 2500 isn't a full synthesizer — it's a Eurorack filter module inspired by the ARP 2500 system. Specifically, it resurrects the long-overlooked ARP 1005, a rare module mentioned in brochures but seldom seen. AMSynths rebuilt it for modern modular rigs with obsessive authenticity, combining the original’s circuit topology with modern components like WIMA capacitors. The result is a faithful reincarnation of a lost ARP concept, bringing its spectral presence into the Eurorack format.
Specifications
| Product type | Eurorack filter module |
| Filter type | 12dB/octave bandpass |
| Component detail | modern precision and lush WIMA caps |
| Filter configuration | Eight fixed bandpass filters spaced an octave apart |
| Module Width | 12 HP |
| Form Factor | Eurorack |
| Synthesis Type | Analog |
| Features | Retain both the Ring Modulator and VCA; Level pots |
| VCA modes | Linear and exponential mode |
| Original price | £295 GBP |
Design
The AMSynths 2500 is a re-imaging of the four-quadrant multiplier and VCA from the ARP 1005 module, rebuilt with fat traces and modern reliability while preserving the original’s sonic character. It uses a standard ARP transistor in the VCA and aims for surgical precision in replicating the analog warmth of the 1970s design. Built as a "faithful, fat-trace reincarnation," it summons the ghost of the ARP 2500 with zero compromises in signal path integrity.
Context
The ARP 1005 was never a star of the ARP 2500 system — more of a spectral footnote, referenced in brochures but rarely encountered. The hulking, patch-cord jungle of the ARP 2500 was shaped by artists like Stevie Wonder and Wendy Carlos, but its 1005 module remained obscure. AMSynths’ revival brings this lost concept into focus, reborn for modern modular synthesis with direct lineage to one of analog’s most legendary systems.
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