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Telmar

Neumann W492 EQ - How to change the Q-value ?
« on: July 26, 2009, 10:26:17 AM »
Hi folks,

can anybody please explain what I have to do to get the Neumann W 492 bell-EQ-curves more narrow ?
Referring to "Audioxs" papers "page 2 of 4" I thought it´s done via R24, but I can only get it wider.
 
Thanks !
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CJ

Re: Neumann W492 EQ - How to change the Q-value ?
« Reply #1 on: July 26, 2009, 01:51:02 PM »
just find all the dcr and take it out.

there might be some you could reduce in the inductor by using bigger wire and a bigger core, and/or drop the series resistor if there is one, but how would we know, as we have no schemo to gaze and ponder.

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If I can't fix it, I can fix it so nobody else can!
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Telmar

Re: Neumann W492 EQ - How to change the Q-value ?
« Reply #2 on: July 26, 2009, 02:27:46 PM »
Sorry ... I thought the Neumann W492 is a popular project at The Lab ...

So here´s the schematic-link from audiox:

http://audioxxx.googlepages.com/W492_sch.pdf
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Telmar

Re: Neumann W492 EQ - How to change the Q-value ?
« Reply #3 on: July 27, 2009, 05:19:05 AM »
Nobody knows how this thing´s working ?
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cuelist

Re: Neumann W492 EQ - How to change the Q-value ?
« Reply #4 on: July 27, 2009, 10:34:56 AM »
Telmar,

This looks like a pretty standard state-variable filter, by far the most common implementation of a 'parametric' equalizer.

Do a Google search for "state variable filter" or "state variable eq" and you'll find plenty of resources.


C.
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Mr K
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