2 pole vs 4 pole?

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DanZorn
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Joined: Wed Oct 28, 2009 5:18 am

2 pole vs 4 pole?

Post by DanZorn » Tue Nov 03, 2009 11:36 am

What is the difference between 4 pole and 2 pole and what is the difference in sound?
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Bryan T
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Joined: Mon Mar 06, 2006 4:23 pm

Re: 2 pole vs 4 pole?

Post by Bryan T » Tue Nov 03, 2009 12:08 pm

DanZorn wrote:What is the difference between 4 pole and 2 pole and what is the difference in sound?
A 4 pole filter filters more than a 2 pole filter. A 4 pole low pass filter will remove highs at 24 dB per octave. A 2 pole low pass filter will remove highs at 12 dB per octave.
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EricK
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Post by EricK » Tue Nov 03, 2009 12:14 pm

In addition to what Brian T said, the fewer the poles, the brighter the sound.
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otto
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Post by otto » Sat Nov 14, 2009 12:46 am

Some other well know filters are 2 pole so if you are trying to get something more like a Oberheim Sem sound or MS-10/20, they used 2 pole filters. Not that an LP is going to sound like the afforementioned synths but in 2 pole you'll get closer to the filter response than you will in 4 pole.
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