What freq's best for sub graphic EQ? - diyAudio
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Old 8th March 2005, 09:18 PM   #1
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Default What freq's best for sub graphic EQ?

Recently, I had a whole bunch of cheapo components and kits donated to me by a hobbyist leaving the country. One of the items was a cheap graphic EQ kit board, 5 sliders/channel, active of course. It has no value to me as it is, but I thought it would be great and easy to swap RC pairs to make it into a graphic EQ just for subwoofer use.

So 2 questions:
1) What would be the most useful freq range for it? Something like 20, 40, 60, 80, 100 Hz?
2) Would this idea work, or is likely to fail because the filter order is too shallow? Do the commercial bass EQ products use high order filters for this reason?
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Old 8th March 2005, 09:24 PM   #2
DonoMan is offline DonoMan  United States
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8, 16, 32, 64, 128 (or so) -- of course, 8 isn't really necessary and depending on the sub, 16 probably isn't either. But if you've got 5 sliders, might as well do something with them.
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Old 9th March 2005, 01:36 AM   #3
mike.e is offline mike.e  New Zealand
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graphic! yuck! parametric is the way to go

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Old 9th March 2005, 03:24 AM   #4
simon5 is offline simon5  Canada
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I would go with 20-28-40-56-80 or something.
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Old 9th March 2005, 09:44 PM   #5
mike.e is offline mike.e  New Zealand
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Yes id do something like that,20hz-80hz only,hopefully the centre frequencies will end up on room modes for best result
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Old 11th March 2005, 07:26 PM   #6
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There's no good way to answer that question. "Graphic yuk" is not unexpected because the center frequencies of graphic EQs are fixed whereas a parametric center frequency can be programmed. One solution, especially since you have the opportunity to customize this unit, would be to take a SPL meter and a test disc and measure the LF response of your room to find out where your problem frequencies are then build the EQ accordingly.
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Old 13th March 2005, 05:32 AM   #7
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