VHL-3C is based on Black Rooster Audio’s component-based circuit simulation technology which was used to emulate the classic Pultec passive filter design. The plugin is suitable for cleaning up the high and low end of the processed signal’s frequency spectrum before it reaches an EQ or a compressor. The emulated filters sounds very natural and transparent, making them more suitable for use on certain types of audio material compared to a standard parametric EQ (most of which have built-in high-pass and low-pass filters).
The control scheme is very simple and intuitive. There’s a bypass switch, two cutoff knobs (one for each filter), and a switch for adjusting the filter slope. The cutoff knobs aren’t smooth. There’s a range of preset values to choose from, along with the “OFF” setting for each filter. The high-pass filter ranges from 50 Hz to 2 kHz, whereas the low-pass filter ranges from 1.5 kHz to 15 kHz.
