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| Computer Audio, DSP, and Crossovers http://dcaudiodiy.com/phpBB3/viewtopic.php?f=4&t=658 |
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| Author: | brombo [ July 11th, 2016, 4:04 pm ] |
| Post subject: | Computer Audio, DSP, and Crossovers |
I wonder if any of you is interested in using your computer for audio/video sources and a surround sound preamp with dsp crossover using a high quality sound card (Asus Xonar, etc.). An interesting link for a dsp crossover using all free software is - http://rtaylor.sites.tru.ca/2013/06/25/ ... are-howto/ http://rtaylor.sites.tru.ca/2013/03/20/ ... tware-dsp/ http://rtaylor.sites.tru.ca/ Look at second solution in link below - http://www.linkwitzlab.com/LX521/DSP_challenge.htm Is anyone else in the group interested in this sort of thing |
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| Author: | HAL [ July 11th, 2016, 4:49 pm ] |
| Post subject: | Re: Computer Audio, DSP, and Crossovers |
Here is another possible DSP based multichannel HiRez DAC as well only for stereo listening with all 8 channels reconfigurable via software on a PC: http://www.danvillesignal.com/high-perf ... hannel-dac Used minimum phase DAC filtering as well. USB, S/PDIF and A/D inputs. All analog I/O is balanced or single ended. |
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| Author: | brombo [ July 11th, 2016, 5:55 pm ] |
| Post subject: | Re: Computer Audio, DSP, and Crossovers |
But you can't program it from linux and it is not clear if it would run under linux. Is it audibly better than the varieties of the miniDSP? What is needed for the general system (surround sound + electronic crossovers) are sound cards/DACs that you can clock sync such as the Hammerfell boards if you need more than eight channels (say 7.1 surround sound with some of the channels bi or tri amplied). http://www.rme-audio.de/en/products/ove ... xpress.php |
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| Author: | HAL [ July 11th, 2016, 6:07 pm ] |
| Post subject: | Re: Computer Audio, DSP, and Crossovers |
Does not work with Linux as the software interface runs on Windows. Only does two channels per unit, but you can use analog inputs from any AV processor for a surround sound for as many channels as you like. Beats the sound of every stock or moded DCX2496 and DEQX I have heard and measures better. Works for me in The Megalith speaker system I built in the Projects area. |
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| Author: | brombo [ July 11th, 2016, 8:59 pm ] |
| Post subject: | Re: Computer Audio, DSP, and Crossovers |
I am trying to avoid extra dac to adc conversions. I have been told that you need to sync all dac's in a system or the audio phase between different dac's will drift and be audible. If that is true all the 2x8 dac's you suggested need to have a clock sync input. My ultimate objective is to have as many channels as I need for each speaker and for as many speaker as I have. Initially, I need 8-channels (your quality standard 7.1 sound card will work) where the main speakers (cbt36k's) are bi-amped and all the other channels have passive crossovers. |
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| Author: | HAL [ July 11th, 2016, 9:08 pm ] |
| Post subject: | Re: Computer Audio, DSP, and Crossovers |
All 8 DAC channels are synced to one master clock so no phase issues over an I2S Bus interface internal to the motherboard from the ADSP21479. It can be configured for a 4 way crossover or 3 way crossover with extra subs with time delay or anything needed. It can also be firmware burned so it just powers up running from any of the interfaces. I will be multiamping my speakers with 20 amp modules, once the ribbon tweeters arrive and I setup the 16 channel version of the dspMusik. If the AV processor has multiple S/PDIF outputs, 2 channels at a time, it will work, most likely would be A/D's and you have ruled that interface out. Good luck. |
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| Author: | brombo [ July 11th, 2016, 9:39 pm ] |
| Post subject: | Re: Computer Audio, DSP, and Crossovers |
My question was if you have multiple 8 channel dac's (such as the 2x8 you referenced) can the multiple 8 channel dac's have a common clock (for example 16 channels with a common clock with bit accurate phase for each of the 16 channels)? |
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| Author: | HAL [ July 11th, 2016, 10:53 pm ] |
| Post subject: | Re: Computer Audio, DSP, and Crossovers |
The answer is yes. Once clock is running all 4 or 8 DAC's so everything is synced. Without that, the intermod products caused by different clocks in the output would be awful. |
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| Author: | eseay212 [ August 3rd, 2016, 2:47 am ] |
| Post subject: | Re: Computer Audio, DSP, and Crossovers |
Hi. I use a computer as my source with a miniDSP OpenDRC-DI (seen here https://www.minidsp.com/products/opendr ... opendrc-di). The miniDSP is positioned between my USB/Coax converter and my DAC. I bought the MiniDSP initially for digital IIR filters to help tame the frequency response of my 8" full range Tang Band drivers. Since then I've switched to vintage Altec components with Altec XOs. I plan to use the FIR filters of the Open DRC-DI to help with phase correction. I recently downloaded Rephase for this but haven't had time to implement it yet. https://sourceforge.net/projects/rephase/ I also own a MiniDSP 2x4 which I've installed in my car to provide XO to my front stage components. It's positioned between my headunit and my 4 channel amplifier to privide XO and time alignment / delay. I installed it only a few weeks ago but inital results are quite promising! Linkwitz labs has several speaker designs utilizing the miniDSP. Everett |
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| Author: | HAL [ August 3rd, 2016, 8:16 am ] |
| Post subject: | Re: Computer Audio, DSP, and Crossovers |
If you use Foobar2000 as your music player, MathAudio Room EQ is a free component to do speaker and room correction. It runs on a Windows 7-10 OS PC. It uses minimum phase correction techniques. |
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