AM1013 Octave Fixed Filter Bank - Band Pass Perfection

AMSynth launch the next "lost module" of the ARP 2500. Eight 12dB fixed band pass filters in parallel, each with a nice gentle resonance. Individual outputs, mix outputs and a bypass feature. Perfect for post processing sounds, More resonance can be dialed in with VCA module feedback loop that uses the dual inputs and outputs.

[@Jon-BEDM]

Perfect delivery of fatness and articulation.🔥

[@synthesizerhome2041]

Hi Rob, the oscillators sound very massive. Which ones did you use here to demonstrate the filter bank??

[@amsynths]

Hi, two B1004 VCOs the ARP design turned out really well. Rob

[@TheMachinesWon]

🔥🔥🔥

[@DavidSimons-ss5kn]

I'm planning to buy 2 of these soon to make up for selling a scratch built 2u rack dual version of the Ems filter bank I made years ago & recently sold to someone in Germany who said it was the best eq he'd heard. As far as I know it was unique. I had thought about the analogue systems but unlike my build & the AM version it lacks the separate outs. Also the AM is a lot prettier to look at! I'm curious that the ARP design is almost identical to the EMS, how that came about or which came first. Anyone know the story of that? Incidentally I couldn't see a bypass on the circuit diagram & wasn't sure how to do it noiselessly so on each channel I wired dual pots as to combine a mix balance control with bypassing at one extreme, marked bypass on the panel, which to my amazement worked! I also added a simple vu meter to each side.

[@amsynths]

I built a few rack mount clones before putting the circuit into Eurorack. It is a great filter/eq that Klaus Sculze used in the mid 1970’s. I dont know for sure what the original ARP design would have been but its unlikely they would clone the Moog version wth inductors. Given they adopted Op Amps very early its likely they would have gone the EMS route, the gyrator op amp circuit was available published in IEEE in June 1969, so this ties in nicely with the ARP plans to expand the 2500 in 1970. The authors were at Minneapols University.

[@a100user]

Lovely Rob, when do you expect them to be in the web shop?

[@amsynths]

First batch sold out immediately. Second batch is due 10 September.

[@a100user]

Thanks Rob

[@drydessert4198]

very noisy

[@maximilianmilf8653]

Just use Ableton...

[@llanginger]

Why?