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Analogue Filter Types?
Old 22nd October 2013
  #1
Lives for gear
Analogue Filter Types?

I've done some searching on the forum but I haven't found a thread that lists the different types of analogue filters in classic and current synths. Before I buy another analogue synth I want to know if it will expand or duplicate my current filter palette. Also, is there a filter out there that I don't know about that I should add to my palette? How many different types of filters are actually out there (not talking modular here, that would be too big of a topic)? From what I have been able to gather there are half a dozen classic designs that have been copied over the years and a few one off unique designs. Given my current collection of filters, is there a new synth on the market that would give me a new sound?

I have-
Moog Rogue
ESQ1
BassStation (original)
Electrix Filter Factory
Akai AX73
Old 22nd October 2013
  #2
Gear Maniac
 
SyntheticFlyer's Avatar
 

Waldorf Pulse 2. Maybe? This is copied from their website:

As an all-new, all-analogue synthesizer design, Pulse 2 flawlessly delivers exactly what synth connoisseurs around the world have been truly craving for quite some time — three analogue oscillators living in perfect harmony with a VCF (VoltageControlled Filter), yet we did not stop there: the fresh filter circuits in the Pulse 2 now offer 12dB Highpass and Bandpass modes in addition to 24dB/12dB Lowpass for strengthened sound-sculpting flexibility, while we added analogue Filter FM, two Overdrive circuits, and Ring Modulation from OSC 3, together with Paraphonic and Unison modes allowing up to eight-voice chords — a fantastic feature found on our recently-released Rocket Synthesizer.
Old 22nd October 2013
  #3
Lives for gear
 
acreil's Avatar
 

Here's a basic overview

4 pole lowpass filters: Sometimes these are tapped at multiple points to provide 2 pole modes or other responses, as in the Oberheim Xpander, but they're still really 4 pole filters.

-cascaded integrator: most common "Roland style", most CEM/SSM filters. The Korg Poly 61 seems to have an unusual 2 pole variant of this.

-transistor ladder: classic Moog filter, also appears in some Roland, Kawai, Crumar, etc. models. The SSM 2044 is similar.

-diode ladder: EMS Synthi, Roland TB-303 and some early SH models.

2 pole filters: These are often switchable between low pass, high pass and band pass, sometimes cascaded for 4 pole responses.

-state variable: Yamaha CS series, Roland Jupiter 6, Elka Synthex, Rhodes Chroma, EDP Wasp, Oberheim SEM...

-sallen key: unusual, often weird and distorted sounding; I think they were used in the Korg MS-20 and Minikorg, Buchla, Yamaha GX-1, SY-1 and SY-2, Steiner-Parker Synthacon, and Arturia Minibrute

Last edited by acreil; 22nd October 2013 at 06:39 PM.. Reason: proofreading, etc.
Old 22nd October 2013
  #4
Lives for gear
Quote:
Originally Posted by acreil View Post
Here's a basic overview

4 pole lowpass filters (sometimes these are tapped at multiple points to provide 2 pole modes or other responses, as in the Oberheim Xpander, but they're still really 4 pole filters):

-cascaded integrator: most common "Roland style", most CEM/SSM filters. The Korg Poly 61 seems to have an unusual 2 pole variant of this.

-transistor ladder: classic Moog filter, also appears in some Roland, Kawai, Crumar, etc. models. The SSM 2044 is similar.

-diode ladder: EMS Synthi, TB-303, some early Roland SH models.

2 pole filters (often switchable between low pass, high pass and band pass, sometimes cascaded for 4 pole responses):

-state variable: Yamaha CS series, Roland Jupiter 6, Elka Synthex, Rhodes Chroma, EDP Wasp...

-sallen key: unusual, often weird and distorted sounding (I think Korg MS-20, Buchla, Yamaha GX-1, SY-1 and SY-2, Steiner-Parker Synthacon, Arturia Minibrute)
Thanks for this great info!
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