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Old 1st April 2004, 06:29 PM   #1
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Question parametric equalizers

is the 'Q' on all parametric equalizers a set amount (ie. a 'Q' of .5 is 2 octaves) or does each manufacturer set their own standards for 'Q'? i specifically am wondering about my Alpine 3402 (car audio)
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Old 2nd April 2004, 03:19 AM   #2
haldor is offline haldor  United States
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Q = 1 means the filter has a bandwidth of 1 octave. This is standard as far as I have ever seen
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Old 2nd April 2004, 03:23 AM   #3
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so then a Q of 10 would mean 1/10 of an octave?
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Old 2nd April 2004, 12:52 PM   #4
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Yes, a Q of 10 means the filter's -3dB bandwidth points(half power) will be 0.1 octave. It's a simple mathmatical inversion.

-Bruce
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Old 2nd April 2004, 01:15 PM   #5
macboy is offline macboy  Canada
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Q is defined as the bandwidth divided by the center frequency, both in Hz of course. So an EQ with a bandwidth of 5000 Hz centered at 10000 Hz has a Q of 0.5.

The problem is that "bandwidth" is not strictly defined. That is where the difference between manufacturers come. One common definition is where the EQ has half the boost or cut as at the center frequency.

For more information than you could ever want, try reading up on Constant-Q EQ's and Exposing Equalizer Mythology and Operator Adjustable Equalizers at Rane Audio's website.
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Old 26th April 2004, 08:41 PM   #6
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Default Q

I think it's like this

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Old 15th February 2005, 06:56 AM   #7
Slab is offline Slab  United States
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I'm no expert but let me try to understand the question.
"Is the Q on all parametrics the same?"
I thought "parametric" meant adjustable parameter. Every equalizer has three basic parameters: Gain, Frequency, Bandwidth (Q). Every parametric I've seen had adjustable gain and freq and Q. Usually a Q from about .5 oct to 2 oct. The mathematical relationships between Q and freq can be seen in the other forum responses. I am not familiar with the Alpine EQ but if the Q is not adjustable it has very limited capability.
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Old 16th February 2005, 04:49 AM   #8
Enzo is offline Enzo  United States
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Oh, I get it. Not all parametrics have adjustable Q, and if yours doesn't, then you want to know what they made it, yes? That would be up to them and what they wanted to achieve. There would be no particular standard, though it might well be that more than one maker might settle upon a similar figure as the best overall compromise.
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