New DAC for RPI with subwoofer out (2.1 or 2.2) - diyAudio
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Old 5th August 2016, 10:16 AM   #1
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Default New DAC for RPI with subwoofer out (2.1 or 2.2)

We have designed a new DAC working with any SBC/RPI (i2s)

We are using 2 DAC ics PCM5142 with integrated DSP. The PurePath software from TI is available for download (registration required) and can be used to create specific filters and other audio functions.

The board will come pre programed as a 2.1 output (but you can create your own custom design and load it the board and can access the xover frequency directly from linux (we made a small app)

Hardware wise , we have split the digital and analog side with LDOs and we feed the analog side using an extremely capable (low noise ultrahigh psrr) LT3042. Basically each board has 4 LDO (2 for each DAC ic) (note that digital side uses cheaper LDOs)

Of course , on the analog side we used only thin film resistors and poly caps in audiopath.

This DAC has RCA outputs but also a small connector that will connect to our TPA3118 AMP shield (only LR)

Edit: it works as a 2.0 , 2.1 or 2.2
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File Type: jpg piano2.1 top.jpg (897.4 KB, 1129 views)

Last edited by cdsgames; 23rd August 2016 at 07:47 PM.
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Old 8th August 2016, 08:36 AM   #2
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I am including a video of the Purepath so you can see the capabilities of soft. We are able to have 4 poles crossover filters , volume etc for files that are 24/192Khz
https://www.youtube.com/watch?v=fAbiMoIj53o

We send only HPF frequency's over 80Hz (chose from 60-150Hz) to main speakers and rest LPF to subwoofer.
Its hard to explain the sound improvement , but he unit sounds clean , effortless .

ETA to launch Aug 26. Price less than 50$
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Old 12th August 2016, 06:06 PM   #3
cph2000 is offline cph2000  Denmark
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this looks like a nice little board at an attractive price
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Old 13th August 2016, 06:00 PM   #4
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...
ETA to launch Aug 26. Price less than 50$
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Old 17th August 2016, 06:28 AM   #5
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Attached is the LR flow. We are using biquad filters each filter is 2 pole and we cascade 2 filters so totally 4 pole in each channel.
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Old 17th August 2016, 06:18 PM   #6
Dimdim is offline Dimdim  Greece
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Interesting board!

How do you control volume? Do you use the PCM5142's hardware volume control?
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Old 17th August 2016, 06:23 PM   #7
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Yes..of course we could use the DSPs volume control but it has no advantage and it takes some DSP cycles

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Interesting board!

How do you control volume? Do you use the PCM5142's hardware volume control?
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Old 17th August 2016, 07:11 PM   #8
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Interesting board!

How do you control volume? Do you use the PCM5142's hardware volume control?
Good point... how the heck do you control the sub volume?
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Old 18th August 2016, 06:42 AM   #9
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there are 2(1/2) scenarios:

Control of sound by DAC (AMP at fixed volume)
In that case both soft volumes can move in tandem (subwoofer can even be specified at % of LR volume)
Control of sound by AMP (DAC at max) .
We suggest to keep the volume of the SUB at a lower level (enough for most situations)..control on LR with your AMP. The sub will only supplement some bass.

most used scenario...we keep the volume of the AMP somewhere in the middle and we control the volume (a bit higher or lower) using 1 scenario.

Last edited by cdsgames; 18th August 2016 at 06:45 AM.
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Old 18th August 2016, 07:24 PM   #10
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Ok

With the default DSP is the LR full range (no xover applied)?
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