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Computer DSP PLUS External Analog Frequency Splitter??
Computer DSP PLUS External Analog Frequency Splitter??
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Old 6th July 2021, 09:30 PM   #1
jdubs is offline jdubs  United States
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Default Computer DSP PLUS External Analog Frequency Splitter??

Hey guys

Ok, I want my system do use a DSD dac but I also want to biamp my speakers plus have 2 subs. There aren't many (hardly any) DSD DACs with >2 channels.

So, what about doing DSP correction at a 2-channel level and then go from the DAC to an active analog crossover (like a Marchand) to get me 6 channels of output.

Does that make sense? Or would the phase get screwy?

By the way, DSP correction would be for the room and would be via convolution (Audiolense).

Thanks!!
Jim
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Old 21st July 2021, 03:01 PM   #2
Markw4 is online now Markw4  United States
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You can do that. An analog crossover can't be linear phase, if that's okay.
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Old 21st July 2021, 03:34 PM   #3
billshurv is offline billshurv  United Kingdom
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Computer DSP PLUS External Analog Frequency Splitter??
Why not just get 3 2 channel DACs? Do it properly.
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Old 21st July 2021, 06:48 PM   #4
HenrikEnquist is offline HenrikEnquist  Sweden
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Quote:
Originally Posted by billshurv View Post
Why not just get 3 2 channel DACs? Do it properly.
Doing it properly means using a single multichannel DAC. That's the way to ensure all the channels are properly in sync.

Selecting a dsd DAC first, and then designing the rest to get around the limitations from that first choice seems a bit backwards IMO.
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Old 21st July 2021, 09:53 PM   #5
billshurv is offline billshurv  United Kingdom
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Computer DSP PLUS External Analog Frequency Splitter??
explain why it will get out of sync. I don't see your point.
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Old 21st July 2021, 10:07 PM   #6
HenrikEnquist is offline HenrikEnquist  Sweden
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Each DAC will have it's own clock, so they will drift with respect to each other. The only way to get that working well is to feed identical dacs with spidf signals from a single multichannel interface.
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Old 21st July 2021, 10:13 PM   #7
billshurv is offline billshurv  United Kingdom
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Computer DSP PLUS External Analog Frequency Splitter??
How much drift? What is the audible effect?
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Old 22nd July 2021, 07:27 AM   #8
HenrikEnquist is offline HenrikEnquist  Sweden
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For a single song, very little. But listen to a few albums and it could reach hundreds of milliseconds.
The audible effect depends on what is connected to what, but things like stereo image tilting to one side, or the summing of a crossover getting messed up.
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Old 22nd July 2021, 02:21 PM   #9
Markw4 is online now Markw4  United States
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Even with a stereo DSD dac and an analog crossover, it should be possible to digitally frequency compensate the overall speaker system as much as the room. That's likely what would end up happening anyway. Its also what I did during the time some JBL M2 speakers were here on loan. It sounded pretty good that way. The line level analog crossover was implemented with OPA1612 opamps and high quality passive components. AK4499 DAC was running in DSD mode.
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