This means a 2-pole filter = 12 dB/octave slope and that's because 6 dB x 2 = 12 dB.
Furthermore, a 4-pole filter = 24 dB/octave slope and that's because 6 dB x 4 = 24 dB.
So what's important to remember is that a 2-pole filter is synonymous with a 12 dB filter whilst a 4-pole filter is interchangeable with the term 24 dB filter.
▶ What's The Difference Between A 2-pole Filter And 4-pole Filter?
The most significant difference between a 2-pole filter and a 4-pole filter lies in their distinctive sounds they generate when used on a synthesizer or as an equalizer.
A 2-pole filter is more gentle as compared to a 4-pole filter which is much more steeper. The end result is that a 2-pole will produce smoother sounds than a 4-pole filter.
You can do a simple experiment were you both set a 2-pole filter and 4-pole filter at a center frequency of 1 kHz and you should hear that a 2-pole will sound brighter whilst a 4-pole will have a darker sound to it.
▶ When Should You Use A 2-pole Filter And A 4-pole Filter?
The choice of deciding between a 2-pole filter or a 4-pole filter in the context of sound design is all about the final sound you are aiming for.
There are certain sounds that may require a gentle filter such as keys, leads, strings, pads, brass and so forth. Hence, it will be ideal to try out a 2-pole filter first.
On the other hand if you want tighter sounds which have a dark tone then a 4-pole filter will do you more justice than your 2-pole filter.
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1 Pole Free Vst Filters
VST 4 FREE - Free Audio Plug-ins and Archives. TAL-Filter is a free Multi-mode filter plugin developed by Togu Audio Line. 4 Pole, 2 x oversampled non linear. Glitch 1.3 by DBlue is a free VST that can be used to add a different texture to your music. You get the option to program it using various filters like Crusher, Delay and many more. It can help to create some unique effects which can provide a different dimension to your music.