VHL-3C
Key Features
- Authentic Pultec HLF-3C circuit emulation using real-time SPICE-type component modeling that captures filter stage interaction and load resistance behavior
- High-pass filter with continuously variable cutoff from 50 Hz to 2 kHz at 18 dB/octave slope for removing rumble and low-end mud
- Low-pass filter with variable cutoff from 1.5 kHz to 15 kHz at 18 dB/octave slope for taming harshness and sibilance
- Auto-adjusted oversampling with linear-phase Dolph-Chebyshev polyphase design that adapts to session sample rate for transparent processing
- SSE2-optimized DSP pipeline for efficient CPU performance despite complex circuit simulation calculations
- HighDPI and Retina display support with four selectable GUI scaling options across all major plugin formats
Description
VHL-3C by Black Rooster Audio is a vintage high-pass and low-pass filter plugin modeled after the Pultec HLF-3C, a sought-after passive filter processor from the early 1950s. Built around a cascade of two constant-K filters, it delivers the same musical and interactive filtering behavior as its analog counterpart.
The plugin provides three intuitive controls: a high-pass dial that rolls off the low end between 50 Hz and 2 kHz, a low-pass dial ranging from 1.5 kHz to 15 kHz, and an output level knob. Both filters feature an 18 dB per octave slope, offering steeper roll-off than a typical parametric EQ's built-in filters.
Black Rooster Audio developed VHL-3C using real-time SPICE-type component-based circuit simulation, faithfully modeling every crucial part of the passive filter network including filter stage interaction and the influence of different load resistances. The result is a filter that sounds natural and transparent, preserving the character of the source material while cleanly removing unwanted frequencies.
The emulated filters excel at cleaning up the high and low end of signals before they reach an EQ or compressor in the chain. A useful creative trick is setting both filter knobs to their extreme positions, which produces a narrow telephone-line bandpass effect.
VHL-3C includes auto-adjusted oversampling using a low-latency linear-phase Dolph-Chebyshev polyphase design that adapts to your session's sample rate, keeping CPU usage efficient while maintaining audio transparency. The plugin also supports HighDPI and Retina displays with adjustable GUI scaling.
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Frequently Asked Questions
What hardware is the VHL-3C modeled after?
VHL-3C is modeled after the Pultec HLF-3C, a passive high-pass and low-pass filter unit from the early 1950s. Black Rooster Audio used real-time SPICE-type circuit simulation to capture the behavior of the original's constant-K filter cascade, including filter stage interaction and load resistance characteristics.
How does VHL-3C compare to a standard parametric EQ's built-in filters?
VHL-3C offers steeper 18 dB per octave filter slopes with the musical character of passive analog circuitry, which sounds more natural and transparent on certain material. Standard parametric EQ filters tend to be more clinical, while VHL-3C preserves the tonal warmth of the source during roll-off.
Can VHL-3C be used creatively beyond basic filtering?
Yes. Setting both filter knobs to their extreme positions creates a narrow bandpass that produces a vintage telephone-line effect, which works well on vocals, guitars, and lo-fi production elements. The interactive filter behavior also makes it useful for broad tonal shaping on mix buses.
Does VHL-3C require an iLok or special hardware?
No hardware dongle is required, but VHL-3C does use Black Rooster Audio's challenge-response activation system. You need to create a free account on their website to receive a serial number, then activate the plugin online or offline. USB key activation is also supported for portable use.
