Programmable Digital X-over board? - Page 2

transphere · 7th December 2009, 08:37 AM

As a alternative, you could also look into the Freescale Symphony Soundbite: basically a Motorola 563xx based DSP board with onboard AKM codecs and everything. It's not lightning fast at 180 MIPS, but should be enough for iir crossover work and at $150 quite a nice package.

Elbert · 12th December 2009, 03:53 PM

Thanks for all the info regarding developers kits!

However, I'm not quite sure if I'll be venturing down that path, looks like it is necessary to do quite some configuration and programming with those beyond just plugging in the parameters.. My experience with DSP's and more advanced digital electronics is limited to say the least, and although I could probably dive in to it, I need something I can get to work with a modest effort, lest I'll never complete my project!

Robert GS · 12th December 2009, 05:26 PM

The Motorola DSP is obsolete in the sense that it only operates with 24bits - you don't get much High-End processing as they claim. The DSP56371 were top notch in the mid '90...

Elbert · 12th December 2009, 05:55 PM

Well, that obviously needs to be considered, I don't wish to sacrifice sound quality because of inadequate processing capacity or other issues..

transphere · 14th December 2009, 07:45 AM

Double precission is always an option, and going floating point will have a significantly higher price tag. TI has some evaluation/development boards for the 67xx floating point dsp's but these are imho too expensive for crossover development.

But even an 150-ish MIPS legacy Motorola will be able to do quite complex crossover work. As long as you stay away from long FIR filters, dozens of biquads on decent (96k) samplerates with double precision shouldn't be a problem.

As far of ease of programming, there is a certain learning curve involved. Most eval-boards will ship with decent tutorials an most often a dsp-library, often featuring standard processing elements like FIRs, IIRs and FFTs.

Iain McNeill · 19th January 2010, 09:09 PM

The Red Rocks miniPROC is a good bet then. Reasonable cost, system level programming and from what I've seen, it does it with pretty good dynamic range. Based on TI TAS3103 audio processor it has all the blocks for an XO.
http://focus.ti.com/lit/ds/symlink/tas3103.pdf

miniPROC is only 1-in 2-out but uses highly regarded Wolfson WM8740 DAC.

Haven't got it dialled in yet so no judgments on SQ yet.

Gooki: have you had any USB problems? I got one board won't enumerate with XP.

wakibaki · 19th January 2010, 09:39 PM

PC programmable with analog I/O. Nice, depending on exactly what you intend to do. But depending on what you do want to do, adding another 2 channels of audio output to your PC and some software might be all that is required.

w

Iain McNeill · 20th January 2010, 12:23 AM

Hi WB,
That's a valid solution too. I wanted to run a balanced line to each speaker and then have the speaker do it's own XO and amplification. Ultimately part of a networked system.

Never found the need to invest in fanless PC's so the PC has to be exiled to a remote closet. Wifi isn't reliable here and I haven't run CAT5 everywhere......yet.

For now it's best for me.

Kjeldsen · 25th January 2010, 02:06 PM

A cheap digital x-over would be from MiniDSP, and it's very easy to use. I'm waiting for the digital in/out module, so can't say anything about the sound quality.

Welcome to CAD AUDIO DK has also a range of cheap x-over modules.

At the moment I have Behringer DCX2496, it's ok but too much noise, and to big to fit in a loudspeaker or amplifiercabinet.

nonsub · 25th January 2010, 10:07 PM

Good timing for me on this thread coming up. I'm looking for options to replace my NAXO 3 way.

I don't believe any of the posted solutions have balanced in + out? Thx!

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7th December 2009, 08:37 AM	#11
transphere diyAudio Member Join Date: Oct 2009	As a alternative, you could also look into the Freescale Symphony Soundbite: basically a Motorola 563xx based DSP board with onboard AKM codecs and everything. It's not lightning fast at 180 MIPS, but should be enough for iir crossover work and at $150 quite a nice package.

12th December 2009, 03:53 PM	#12
Elbert diyAudio Member Join Date: Mar 2008	Thanks for all the info regarding developers kits! However, I'm not quite sure if I'll be venturing down that path, looks like it is necessary to do quite some configuration and programming with those beyond just plugging in the parameters.. My experience with DSP's and more advanced digital electronics is limited to say the least, and although I could probably dive in to it, I need something I can get to work with a modest effort, lest I'll never complete my project!

12th December 2009, 05:26 PM	#13
Robert GS diyAudio Member Join Date: Sep 2005 Location: Helsingor	The Motorola DSP is obsolete in the sense that it only operates with 24bits - you don't get much High-End processing as they claim. The DSP56371 were top notch in the mid '90...

12th December 2009, 05:55 PM	#14
Elbert diyAudio Member Join Date: Mar 2008	Well, that obviously needs to be considered, I don't wish to sacrifice sound quality because of inadequate processing capacity or other issues..

14th December 2009, 07:45 AM	#15
transphere diyAudio Member Join Date: Oct 2009	Double precission is always an option, and going floating point will have a significantly higher price tag. TI has some evaluation/development boards for the 67xx floating point dsp's but these are imho too expensive for crossover development. But even an 150-ish MIPS legacy Motorola will be able to do quite complex crossover work. As long as you stay away from long FIR filters, dozens of biquads on decent (96k) samplerates with double precision shouldn't be a problem. As far of ease of programming, there is a certain learning curve involved. Most eval-boards will ship with decent tutorials an most often a dsp-library, often featuring standard processing elements like FIRs, IIRs and FFTs.

19th January 2010, 09:09 PM	#16
Iain McNeill diyAudio Moderator Emeritus Join Date: Oct 2007 Location: Santa Cruz, California	The Red Rocks miniPROC is a good bet then. Reasonable cost, system level programming and from what I've seen, it does it with pretty good dynamic range. Based on TI TAS3103 audio processor it has all the blocks for an XO. http://focus.ti.com/lit/ds/symlink/tas3103.pdf miniPROC is only 1-in 2-out but uses highly regarded Wolfson WM8740 DAC. Haven't got it dialled in yet so no judgments on SQ yet. Gooki: have you had any USB problems? I got one board won't enumerate with XP.

19th January 2010, 09:39 PM	#17
wakibaki Banned Join Date: Jan 2008 Blog Entries: 2	PC programmable with analog I/O. Nice, depending on exactly what you intend to do. But depending on what you do want to do, adding another 2 channels of audio output to your PC and some software might be all that is required. w

20th January 2010, 12:23 AM	#18
Iain McNeill diyAudio Moderator Emeritus Join Date: Oct 2007 Location: Santa Cruz, California	Hi WB, That's a valid solution too. I wanted to run a balanced line to each speaker and then have the speaker do it's own XO and amplification. Ultimately part of a networked system. Never found the need to invest in fanless PC's so the PC has to be exiled to a remote closet. Wifi isn't reliable here and I haven't run CAT5 everywhere......yet. For now it's best for me.

25th January 2010, 02:06 PM	#19
Kjeldsen diyAudio Member Join Date: Dec 2003 Location: Randers, Denmark	A cheap digital x-over would be from MiniDSP, and it's very easy to use. I'm waiting for the digital in/out module, so can't say anything about the sound quality. Welcome to CAD AUDIO DK has also a range of cheap x-over modules. At the moment I have Behringer DCX2496, it's ok but too much noise, and to big to fit in a loudspeaker or amplifiercabinet.

25th January 2010, 10:07 PM	#20
nonsub diyAudio Member Join Date: Jan 2010	Good timing for me on this thread coming up. I'm looking for options to replace my NAXO 3 way. I don't believe any of the posted solutions have balanced in + out? Thx!