Boomstar 4075 Filter

The 4075 filter is a discrete, voltage-controlled, 24/dB/Oct cascaded transconductance low-pass filter, employing six pairs of hand-matched transistors. In its lowest frequency setting it shaves off higher frequency harmonics; its resonance or "Q" circuit pushes those harmonics past the self-oscillation point, projecting a thumpy, thrashing squeal, with explosive low- to mid-range power and depth. The design is actually pulled from the four-pole ARP 4072 (better: more parts and trims), without the notorious and nefarious 12kHz design flaw that hamstrung the original’s high end.

The 4075 filter is the most requested of the Boomstar filter models, perhaps owing to its uniqueness. Has there ever been a better match for a square wave? It weaves dreams with "glide-y," '70s basslines, is a natural in the lead department and feels as if a temper tantrum simmers beneath its veneer of respectability. Aggressive and articulate, this fresh ARP can snap punishing kick drum sounds out as well as color with bright, edgy, stringy tones for essential arpeggiations.

Potentiometer Potential
Three attenuverter and four attenuation pots control the FREQUENCY, RESONANCE, FREQ CV 1, RESO CV, FREQ CV 2, INPUT and OUTPUT, delivering smooth, detailed and complex expression.

Switch it Up
Classic Minimoog FULL and HALF strength filter frequency keyboard/voltage tracking for rounder low end with brilliant highs.

Patch it Up
Seven patch points: 1 V/O, FREQ CV 1, FREQ CV 2, RESO CV, INPUT and 2x OUTPUT direct the deepest manipulation.