Linkwitz-Riley bandpass filter design

Thank you. I would like to be able to boost and cut. Would the Audio EQ
Cookbook (http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt) be of any
help in this case? I guess I would be looking for a shelving EQ. Is there
a better candidate I could use? At present, I'm not thinking about
splitting the sound stream, just processing it.

However, if I do split it, could I use two LR crossovers to split the
input stream, then sum their outputs and apply boosts/cuts to effectively
synthesize a 3 band EQ?

>Thank you. I would like to be able to boost and cut. Would the Audio EQ
>Cookbook (http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt) be of any
>help in this case? I guess I would be looking for a shelving EQ. Is
there
>a better candidate I could use? At present, I'm not thinking about
>splitting the sound stream, just processing it.
>
>However, if I do split it, could I use two LR crossovers to split the
>input stream, then sum their outputs and apply boosts/cuts to
effectively
>synthesize a 3 band EQ?
>
I do realize there might be a few things wrong with my understanding.
Please do let me know what they are so I could learn. Thank you so much
for all your responses. They have really helped a lot. 

On Tue, 19 Feb 2008 16:15:09 -0600, "carleeto" <carleeto@gmail.com> wrote:

>However, if I do split it, could I use two LR crossovers to split the
>input stream, then sum their outputs and apply boosts/cuts to effectively
>synthesize a 3 band EQ?

Only if you also include the allpass compensation detailed in the
D'Appolito paper that I referenced in an earlier reply.

Greg

>On Tue, 19 Feb 2008 16:15:09 -0600, "carleeto" <carleeto@gmail.com>
wrote:
>
>>However, if I do split it, could I use two LR crossovers to split the
>>input stream, then sum their outputs and apply boosts/cuts to
effectively
>>synthesize a 3 band EQ?
>
>Only if you also include the allpass compensation detailed in the
>D'Appolito paper that I referenced in an earlier reply.
>
>Greg
>

Thanks Greg. Will have a look at it. 

>On Mon, 18 Feb 2008 16:35:31 -0600, Vladimir Vassilevsky
<antispam_bogus@hotmail.com> wrote:
>
>>> You know, Vlad, you are the only one who picked up on carleeto's 
>>> fundamental misconception. The rest of read "Linkwitz-Riley" and just

>>> assumed he _meant_ crossover. Good catch!
>
>I have actually designed multiband dynamics processors using crossover
topologies.  Extension of the concept to EQ was not
>difficult.  I figured the OP wanted something akin to the
Bass/Presence/Treble controls on old-time preamplifiers.

That is exactly what I was looking for. In fact, that is also what I was
designing - a simple set of Bass/Presence/Treble controls for use during
playback in the auditorium. 

I found a lot of useful info here :
http://www.planetanalog.com/article/printableArticle.jhtml?articleID=12802683

I was able to use a Linkwitz-Riley crossover topology to achieve this. I
believe the result would be a shelving EQ. 

Thank you for all your help.