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-   -   Active/Room Equalization (http://www.diyaudio.com/forums/multi-way/50229-active-room-equalization.html)

sdclc126 24th January 2005 04:59 PM

Active/Room Equalization
 
I referred to this in my previous thread, but decided to start a new one on this subject by itself...

I am interested in "active", or room equalization of loudspeakers, where the EQ has a mic & pink noise generator. Active may not be the correct term as I believe it referrs only to EQs between the source and the amps, but I guess it's active in that it (potentially) allows a greater degree of correction when one includes room modes as part of the sound experience, which I guess one should!

Anyway, anybody have this? Any kits out there or mid-priced units you might recommend? Again, I'm not looking for high end, just something that gets the job done.

An addendum - if equalizers, with enough bands, can balance a speaker's hills and valleys in frequency response, would this be an acceptable approach, in terms of simplicity, as opposed to doing all kinds of tests trying to build the ideal passive (or active?) crossover design? Isn't this (among other things) what EQs are for?

tiroth 24th January 2005 05:37 PM

The usual cheap suggestion would be DEQ2496.

Room EQ in no way replaces crossover design. If there are nulls in the crossover no amount of EQ can correct them. What it can do is make the crossover designer's job easier; for instance, a design I worked in had a deep off-axis null. I could significantly reduce this null by changing the crossover, but I got a ~3dB bump at another point as a result. This bump can be corrected by EQ, whereas the null could not, so the tradeoff was worth it.

As with everything else in audio, you must optimize the entire system for best performance.

A popular way of killing two birds with one stone is the DCX2496, which has both crossover and limited EQ functionality.

sdclc126 24th January 2005 06:33 PM

Null...
 
Quote:

Originally posted by tiroth
The usual cheap suggestion would be DEQ2496.

Room EQ in no way replaces crossover design. If there are nulls in the crossover no amount of EQ can correct them. What it can do is make the crossover designer's job easier; for instance, a design I worked in had a deep off-axis null. I could significantly reduce this null by changing the crossover, but I got a ~3dB bump at another point as a result. This bump can be corrected by EQ, whereas the null could not, so the tradeoff was worth it.

As with everything else in audio, you must optimize the entire system for best performance.

A popular way of killing two birds with one stone is the DCX2496, which has both crossover and limited EQ functionality.

Yes, this is another product I'm considering - but again, I'm an XO novice - what is a "null"? And what is "off axis"? :xeye:

bzdang 24th January 2005 08:34 PM

Hopefully helpful - dig in !

http://www.rane.com/library.html

This drinking-fountain of knowledge [wwweb] can sometimes seem like a fire hose :)

sdclc126 24th January 2005 08:48 PM

Rane...
 
More OOOOOH! AAAAAAH! factor! Didn't know there was so much out there - thanks! :spin:

ScottG 24th January 2005 09:01 PM

http://drc.wildgooses.com/index.php/Main_Page

pinkmouse 24th January 2005 09:13 PM

I prefer to look after time domain problems with room treatment, a few well placed bookshelves, rugs and items of soft furnishing can make all the difference, without spending more money that could better be spent on music. ;)


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