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-   -   Linkwitz transform circuit in BruteFIR ? (http://www.diyaudio.com/forums/digital-source/42509-linkwitz-transform-circuit-brutefir.html)

birkinshawc 13th October 2004 06:55 PM

Linkwitz transform circuit in BruteFIR ?
 
Hi all,

I know it must be possible to do a linkwitz transform (http://sound.westhost.com/project71.htm) in BruteFIR, but I'm not sure exactly how. For the time being I would like to do linkwitz transform on my sub and my rear channels in my HT setup, (I am not bothered by the loss of dynamic range which will result from applying the boost), though eventually I would like to do Xovers for my front 2-way speakers in BruteFIR too.

The problem is that I have installed BruteFIR/Jack/alsa etc and have no problem with using the DRC package to make a measured room coefficient, but have no clue how to model the linkwitz transform (or xovers) and how I would cascade these coefficients, or how how I would combine them.

Can anyone give any pointers?

Many thanks,

Chris

ps. this seems useful; http://www-users.cs.york.ac.uk/~fisher/mkfilter/ but what do I do with its output?

MWP 14th October 2004 04:55 AM

Have you got Matlab (windows) or Octave (linux)?

Youll need one of these to produce the filter coeffs youll need.

mhelin 14th October 2004 05:31 AM

You can use bilinear transform function in matlab and octave to convert the s-plane eq filter (http://www.linkwitzlab.com/filters.htm#9) to z-plane, but the resulting filter is IIR.

birkinshawc 14th October 2004 07:25 AM

Having just had a look at Octave, and not having a windows machine (or a copy of Matlab) I think this might be all a bit too much for me!

What would happen if I connected the sub to a three-way xover with my front speakers, with no eq, and then recorded a sweep for use with DRC? Would DRC be able to correct the unequalised sub? (my linkwitz transform calculations show I will need a max boost of 12.25dB)

Chris


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