Free Digital Room Correction And PC based Xover

kipman725 · 6th August 2009, 02:11 AM

Hi It's posible to do digital room correction and crossovers without buying anything software wise. Hardware (mesurment mic, soundcard with many outputs) still needed. Anyway it took me a while to find this and I couldn't find any threads from a quick search so just making it easier for people to find this stuff.

ACXOplayer:
Can make digital crossovers and perform DRC. Quite easy to use as well.
http://pcazeles.perso.cegetel.net/acxo.htm

foobar 2000 with convolve plugin:
Import the .wav file containing the output of ACXO into this plugin
http://www.foobar2000.org/components

Instructions on how to build a cheap high performance measurement mic:
http://www.linkwitzlab.com/sys_test.htm

So far I have tried this only with DRC on some cheap PC speakers (as I managed to damage the woofer of my usual speakers) but the result is a definite improvement. Not sure of the quality of this aproach Vs. the pro audio stuff that has a thread already but I can't see why there should be a quality difference is IIR filters are used for crossover and FIR for DRC which seems logical. There do apear to be some issues with ACXO and non 44.1Khz sample rates.

MaVo · 6th August 2009, 10:47 AM

Isnt the f2k convolver only stereo? That would mean, no crossover possible, only DRC.

Ron E · 6th August 2009, 05:54 PM

There is an opensource package called DRC that uses BruteFIR to do this. http://www.duffroomcorrection.com/wiki/Main_Page

fb · 7th August 2009, 01:13 PM

There are free VST plugins and hosts capable of doing both correction and crossover - you just need a soundcard capable of the necessary signal routing (RME works for me). Last I looked fb2k's vst host plugin was stereo only.

Other software to look out for:

VSThost/SAVIhost - VSThost can do semi-modular routing between VSTs
http://www.hermannseib.com/english/vsthost.htm

Has some very useful plugins/tools, including crossover/filter generators -
http://www.ohl.to/

Free convolution plugin-
http://convolver.sourceforge.net/vst.html

6th August 2009, 02:11 AM	#1
kipman725 diyAudio Member Join Date: Jun 2007 Location: London/N.lincs	Free Digital Room Correction And PC based Xover Hi It's posible to do digital room correction and crossovers without buying anything software wise. Hardware (mesurment mic, soundcard with many outputs) still needed. Anyway it took me a while to find this and I couldn't find any threads from a quick search so just making it easier for people to find this stuff. ACXOplayer: Can make digital crossovers and perform DRC. Quite easy to use as well. http://pcazeles.perso.cegetel.net/acxo.htm foobar 2000 with convolve plugin: Import the .wav file containing the output of ACXO into this plugin http://www.foobar2000.org/components Instructions on how to build a cheap high performance measurement mic: http://www.linkwitzlab.com/sys_test.htm So far I have tried this only with DRC on some cheap PC speakers (as I managed to damage the woofer of my usual speakers) but the result is a definite improvement. Not sure of the quality of this aproach Vs. the pro audio stuff that has a thread already but I can't see why there should be a quality difference is IIR filters are used for crossover and FIR for DRC which seems logical. There do apear to be some issues with ACXO and non 44.1Khz sample rates.

6th August 2009, 05:54 PM	#3
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	There is an opensource package called DRC that uses BruteFIR to do this. http://www.duffroomcorrection.com/wiki/Main_Page __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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6th August 2009, 10:47 AM	#2
MaVo diyAudio Member Join Date: Jan 2006 Location: Herne	Isnt the f2k convolver only stereo? That would mean, no crossover possible, only DRC.

7th August 2009, 01:13 PM	#4
fb diyAudio Member Join Date: Apr 2005 Location: Brisbane, Aus	There are free VST plugins and hosts capable of doing both correction and crossover - you just need a soundcard capable of the necessary signal routing (RME works for me). Last I looked fb2k's vst host plugin was stereo only. Other software to look out for: VSThost/SAVIhost - VSThost can do semi-modular routing between VSTs http://www.hermannseib.com/english/vsthost.htm Has some very useful plugins/tools, including crossover/filter generators - http://www.ohl.to/ Free convolution plugin- http://convolver.sourceforge.net/vst.html

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