Stand-alone filters are relatively rare. A short list of static & variable filters plus a few outliers
Static EQ-style filters
- Pultec HLF-3C passive low-pass & high-pass filter (obsolete)
- Harrison Ford filter DIY clone of the filter from a Harrison console
- TK Audio TF1 500-series filter (discontinued)
- Wavetek Filter Set
Dynamic Synth-style filters
- Sherman Filterbank – the original
- Sherman Filterbank 2 – new model of the classic filter / distortion unit
- Akai MFC-42 three-channel filter / effects unit
- Mutronics Mutator two-channel filter with lfo & triggered sweeps
- Ebbe und Flut Schippmann’s über filter box
- Elektron Analog Heat II
- Electrix Filter Factory stereo filter unit
- Waldorf 2-Pole Analogue Filter – stand-alone synth-style mono filter
- FAT PCP330 Procoder Filter Bank – multi-frequency filterbank
- MAM VF11 Vocoder Filterbank
- FAT THC-01 Resinator Filter – more MAM / FAT filter madness
- MAM Analog Filterbank 8
- Bugbrand Bugcrusher
- Jomox M-Resonator
- Peavey Spectrum Filter
- Jomox T-Resonator
- Wavetech 442 Dual Filter
Dynamic & Programmable Equalisers
- SSL SL683E programmable equaliser
- BSS DPR-902 Dynamic EQ
Modwiggler filter thread
https://modwiggler.com/forum/viewtopic.php?t=50143&start=10
Reddit Synth outboard filter page
Could we list all the Filterboxes we know?
byu/Seri05 insynthesizers
Peavey Spectrum Filter #1
MAM Warp Nine Analogue Midi Filter #2
Wavetek Model 442 Filter Set
Electrix Mo-FX
Jomox T-Resonator II
Analog Heat Mk II
Sherman Filterbank 2 Compact
Mutronics Mutator
Akai MFC42
MAM PCP330 Procoder
MAM VF11 Vocoder
FAT THC-00 Resinator Filter
Waldorf 2-Pole Filter
Bugbrand Bugcrusher 08
MAM Filterbank 8
Filter Factory Mk2
