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General Discussions => The Lab => Topic started by: Telmar on July 26, 2009, 10:26:17 AM

Title: Neumann W492 EQ - How to change the Q-value ?
Post by: Telmar 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 !
Title: Re: Neumann W492 EQ - How to change the Q-value ?
Post by: CJ 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.

Title: Re: Neumann W492 EQ - How to change the Q-value ?
Post by: Telmar 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
Title: Re: Neumann W492 EQ - How to change the Q-value ?
Post by: Telmar on July 27, 2009, 05:19:05 AM
Nobody knows how this thing´s working ?
Title: Re: Neumann W492 EQ - How to change the Q-value ?
Post by: cuelist 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.