Dub Filter

AudioThing's Dub Filter is a meticulously modeled emulation of the Altec 9069B high-pass filter, the passive inductor-based circuit that became synonymous with King Tubby's revolutionary dub productions. The plugin captures the characteristic behavior of this 1960s design, which provided 18dB/octave attenuation across stepped frequency positions spanning 70Hz to 7.5kHz, while expanding its sonic palette considerably beyond the original hardware.

The core appeal lies in the filter's harmonic richness rather than clinical precision. Unlike modern digital filters, the Altec's inductor-based topology generates subtle nonlinear artifacts and frequency-dependent behavior that AudioThing has faithfully reproduced. Three advanced controls - Magnetism, Character, and Dynamics - provide sophisticated manipulation of how the filter responds across the audio spectrum. Magnetism shapes the inductance modeling itself, Character introduces harmonic saturation, and Dynamics controls the smoothness of frequency transitions. These parameters allow for everything from subtle tonal warmth to aggressive, resonant filtering.

Built-in modulation via LFO and envelope follower elevates the plugin beyond static EQ, enabling rhythmic sweeps and responsive filter movements that reward experimentation. The stepped frequency knob maintains the original's discrete positions, honoring the hardware's tactile design language while the additional controls facilitate modern production workflows.

Dub Filter serves producers, engineers, and sound designers working across reggae, dub, electronic, and experimental music genres. It's equally valuable as a mastering tool for adding character or as a creative effect for processing drums and bass. Among vintage filter emulations, it occupies a specific and authentic niche, delivering the warm, musical coloration that defined an era of Jamaican music production rather than targeting transparent filtering.