Tag Archives: parallel equalizer

Nova-67P and parallel equalizers explained

How do parallel equalizers work? The signal is passed through band-pass filters, gain applied and then the result is summed with the dry signal.

simple parallel equalizer

band-pass + dry signal = bell shape
low-pass + dry signal = low-shelf
high-pass + dry signal = high-shelf

What is so special about parallel equalizers in digital world? I like the way how bands interact with each other! Check the picture. There’s a typical serial equalizer on the left (SlickEQ GE). There’re 2 bands, 1 kHz and 2 kHz with +6 dB boost on both. In serial equalizers close bands tend to “stick” to each other and in parallel equalizers this effect is less prominent. The difference may be very subtle but for me a typical parallel equalizer provides greater bands separation especially in a busy midrange, which is very suitable for mixing tasks.

serial equalizer vs. parallel equalizer

Parallel equalizers and cuts. Most parallel equalizers operate in a very special way when combining boosts and cuts. Why? Just an example. If you boost an input signal of 1 Volt by +6 dB you have the resulting signal of 2 Volts. So a parallel equalizer adds 1 Volt to the output. If you cut -6 dB from an input signal you have the resulting signal of 0.5 Volts. Thus a parallel equalizer subtracts 0.5 Volts from the output. Now if boost and cut bands are close together a boost band always tends to win because it affects the output more than a cut band. In our example 1 V + 1 V – 0.5 V = 1.5 V (+3.5 dB of total boost). I don’t like such unpredictable behavior! The solution is to connect boost stage and cut stage in series. Check the picture. For this type of connection +6 dB boost and -6 dB cut compensate each other.

parallel equalizer with feedback path


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Nova-67P: the most hardcore KVR Developer Challenge (DC14) submission ever! (just kidding)

Nova-67P is a parallel parametric equalizer plugin combined with a compressor. The compressor can optionally operate in frequency dependent and split-band modes. In this case the plugin operates as a parallel dynamic equalizer.


  • 5 bands parallel equalizer with auto-gain.
  • Optional high-pass and low-pass filters.
  • Full-band frequency dependent and/or split-band compression.
  • Side-chain filtering and pre-emphasis.
  • Third-octave real-time spectrum analysis.
  • External side-chain support.
  • 64-bit internal processing.
  • Hardcore UI style.

Nova-67P is my submission to KVR Developer Challenge DC14! Okay, I didn’t have enough time to prepare truly “commercial looking” plugin but the concept is too cool to drop it away.

Try it:                http://www.kvraudio.com/product/nova-67p-by-vladg-sound/

Comment it:        http://www.kvraudio.com/forum/viewtopic.php?f=91&t=417330

Vote for it:          http://www.kvraudio.com/kvr-developer-challenge/2014/#dc14-9245    (NOTE: register on KVR to vote)


More info about KVR DC14:

Launch: April 2014
Deadline: July 31st
Voting: Aug 1st-24th
Winners Announced: August 25th