Introducing the AM1044 24dB Low Pass Filter, a sleek 12HP module that brings the classic sound of the original AM8044 back to life! This re-issue features the incredible CoolAudio V2044A chip, known for its rich, warm tones and inspired by the legendary SSM2044 found in iconic Korg synths. With enhanced Q compensation, this filter ensures you won't lose any bass response, even when cranking up the Q into self-oscillation. Perfect for modular setups, the AM1044 is your go-to ARP filter for shaping sounds with depth and character. Dive into the world of analogueue synthesis and explore the possibilities with this fantastic module. Cheque out the user manual (PDF), visit ModularGrid, and catch some demos on YouTube to see the AM1044 in action!
12 HP|AM1044 24dB Low Pass FIlter|User Manual (PDF)|ModularGrid|You Tube
OVERVIEW This 12HP wide AM1044 is a re-issue and expansion of the original AM8044 from 2013, using the CoolAudio V2044A chip and some design ideas from the SSI2144 datasheet. The V2044A delivers a fantastic sounding transistor ladder filter, which we have added some amazing Q compensation to.
DESCRIPTION The V2044A is a re-imagined SSM2044 chip which found its way into the various Korg synths like the Mono Poly in the 1980's. In 2013 I issued the AM8044 based around this chip, but its was a low volume run due to its scarcity. Fast forward 13 years and the V2044A chip is easy to source, plus some ideas in the SSI2144 datasheet about how to add Q compensation.
The V2044A chip creates a 24dB cascading ladder filter, with an extra OTA circuit providing Q compensation, which ensures no loss of bass response when Q is driven into self oscillation. The Q circuit also has a Q CV input (with an attenuator) for achieving variable feedback from a CV input. The self oscillation goes down to below 20Hz.
The module has a two way LED circuit which has a green LED to show normal signal levels and a red LED to show boosted levels. Subtle amber LEDs continuously light up the CV potentiometers.
CONTROLS
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- Three audio inputs (INA, INB, INC), with the first two having a volume control
- Four CV inputs to the VCF (CV1, CV2. CV3, CV4), three with a level potentiometer
- Large control knob for filter CUTOFF
- Q is controlled via a dedicated RESONANCE potentiometer
- Q CV input and level control
- Two way switch (Q COMP) selects whether Q compensation is on or off
- ARP 2500 style control knobs
CONNECTIONS There are nine 3.5 mm jack sockets on the anodised aluminium front panel:
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- IN 1, 2 & 3 - audio signal inputs with individual level control
- CV 1, 2, 3 & 4 - 1V/octave control voltage inputs for filter cutoff
- QCV - control signal for adjusting resonance
- OUTPUT - audio signal output
The module comes with a set of M3 mounting screws and washers, and a standard 10 to 16-way Doepfer power cable.
MODULE STATUS: LEGACY MODULE
| Title | AM1044 24dB Low Pass Filter |
|---|---|
| Brand | AMSynths |
| Category | LEGACY |
| SKU | AM1044 |
| Condition | new |
| Weight | 250.0 g |
| Width | 60.6 mm |
| Height | 128.5 mm |
| Depth | 35.0 mm |
| HS Code | 92099400 |
| Country of Origin | United Kingdom |
