Audio Project Amplifier Speaker Loudspeaker Kit
diyAudio.com diyAudio Forums Archive > Top > Source > Digital
 
Linkwitz transform circuit in BruteFIR ? - Click HERE for Original Thread
birkinshawc
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
Have you got Matlab (windows) or Octave (linux)?

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

Page generated in 0.021543979644775 seconds with 17 queries,
spending 0.00639391 doing MySQL queries and 0.01515007 doing PHP things.

Powered by: Search Engine Indexer and vBulletin
Copyright ©1999-2009 diyAudio.com