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This 14HP module is a re-imagining of the ARP 1013 octave filter bank that was announced in 1970 by Tonus as part of the 2500 Synthesize but it never made it into production. It consists of eight band pass filters with their cutoff frequency spaced one octave apart, from 63Hz to 8kHz.
14 HP | AM1013 Octave Filter Bank | User Manual (PDF) | ModularGrid | You Tube
OVERVIEW This 14HP module is a re-imagining of the ARP 1013 octave filter bank that was announced in 1970 by Tonus as part of the 2500 Synthesizer, but it never made it into production. It consists of eight band pass filters with their cutoff frequency spaced one octave apart, from 63Hz to 8kHz.
The filter is very useful for creating formant and vowel sounds. The individual outputs enable voltage control of the filter by using eight external VCA's - for example the 1032 Mixer & Distributor module.
DESCRIPTION The AM1013 is based on contemporary Op Amp based filter bank designs, such as the EMS Eight Octave Bank from April 1971. It uses a 12dB high pass filter in series with a 12dB low pass filter to create eight band pass filters that are connected in parallel and set one octave apart. The filters have a fixed frequency and Q of 5.0.
The eight filter outputs are mixed into a single output with two jack socket. Each filter can be adjusted for level using the ARP 2500 style control knobs. The input and output levels can also be adjusted using the front panel potentiometers.
High quality PPS capacitors have been used to ensure a beautiful sounding filter. The filter has a bypass feature which can be set using the push button switch (with green LED).
The wide frequency range from 16Hz to 8KHz, Q of 5.0, individual outputs and high quality sound make for a unique module that takes its heritage from 1971.
CONNECTIONS There are thirteen 3.5 mm jack sockets on the anodised aluminium front panel:
There are high quality Alpha rotary potentiometers for adjusting the level of each octave filter into the final mix, and for adjusting both the input and output levels.
The module has original ARP 2500 style knobs manufactured by Rogan in the USA.
The module comes with a set of M3 mounting screws and washers, and a standard 10 to 16-way Doepfer power cable.
MODULE STATUS: IN PRODUCTION
| Title | AM1013 Octave Fixed Filter Bank |
|---|---|
| Brand | AMSynths |
| Category | MODULAR 2500 |
| SKU | AM1013 |
| Condition | new |
| Weight | 350.0 g |
| Width | 60.6 mm |
| Height | 128.5 mm |
| Depth | 35.0 mm |
| HS Code | 92099400 |
| Country of Origin | United Kingdom |
Awesome module , makes a very good addition to the behringer 2500 series , it sits nicely in the rack amongst several other AMSynths modules , I would like to get the complete series , but they sell out very quickly . Thoroughly recommend any of the modules here . :-)
Using the AM1013 with the 1050 module is a blast, sounds great...
Awesome module , makes a very good addition to the behringer 2500 series , it sits nicely in the rack amongst several other AMSynths modules , I would like to get the complete series , but they sell out very quickly . Thoroughly recommend any of the modules here . :-)
Paul Ashington · 2026-09-25Using the AM1013 with the 1050 module is a blast, sounds great...
Dan Patrick Larsson Ab, Dan Larsson · 2025-11-10
