Digikey have the 5552. The last digit of both ADC and DAC is just the number of channels, no other signficant difference
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- Thread starter Weeb Labs
- Start date
Rocky Maine
Member
I disabled my security app but that made no difference.
TurtlePaul
Major Contributor
Has anyone considered PCM3168A? It is used in the MiniDSP 2x4 HD, is capable of up to 8 channel output and has a hardware mode.
Rocky Maine
Member
When I used the automatic option there was no list to choose from; it just ran briefly and installed v6.1.7600.16385
- Thread Starter
- #626
Could both of you please try running DSPi Console with elevated privileges? Right-click the executable and choose "Run as Administrator". If this does not help, try switching the driver to libusb in Zadig.
This has been a tricky problem to isolate, as everything works correctly on every machine that I have used as a testbed.
Rocky Maine
Member
Thanks for the suggestions.
Running as admin made no difference.
In Zadig there are these options:
libusbK (v3.1.0.0)
libusb-win32 (v1.4.0.0)
- Thread Starter
- #628
Please use libusb-win32.
According to data sheet, -94 dB THD+N typ, -88 min at 0 dB, no matter what frequency. With digital filter stop band attenuation only 80 dB, there will be a fair bit of noise in that number, so harmonics may be surprisingly low, especially as this is a voltage out DAC, i.e. there are some poor CMOS dacs doing the I/V conversion.
Amir's testing, albeit at -3 dB fs, seems to bear this out: ok performance but even Topping Dacs from 8 years ago are much better:
Review and Measurements and miniDSP 2x4 HD DSP and DAC
This is a brief review and measurements of miniDSP 2x4 HD Processor and USB DAC. I purchased this online and seems like the price as of this writing is USD $207 as of this writing. This is a USB DAC with Toslink optical input and analog/digital in, four channel digital signal processor (DSP)...
www.audiosciencereview.com
Rocky Maine
Member
TurtlePaul
Major Contributor
Amir tested when the 2x4 had the old old AKM chip.Amir's testing, albeit at -3 dB fs, seems to bear this out: ok performance but even Topping Dacs from 8 years ago are much better:
Review and Measurements and miniDSP 2x4 HD DSP and DAC
This is a brief review and measurements of miniDSP 2x4 HD Processor and USB DAC. I purchased this online and seems like the price as of this writing is USD $207 as of this writing. This is a USB DAC with Toslink optical input and analog/digital in, four channel digital signal processor (DSP)...
miniDSP 2x4 HD (DDRC-24) V2 simple measurement and teardown pictures
Since Amirm has reviewed miniDSP 2x4HD, there is new V2 version with different DAC/ADC chip (probably due to AKM fire), seems no one has published the measurement data and pictures of internal components, so I make some simple measurements and teardown. I am new to audio measurement field, so...
www.audiosciencereview.com
Here is the 2x4 v2 with the correct TI chip. 102 dB SINAD and 108 dB SNR. I think acceptable for a chip that can populate the full 8x outputs.
What would the best outputs be for an IO board? Personally I would think: 2x TRS input, 4x TRS output channels 1-4, 2x RCA output channels 5-6, 1x 3.5mm headphone jack behind a pair of BUF634 channels 7-8.
Rocky Maine
Member
TurtlePaul
Major Contributor
Either VBUS or VSYS works - both in the top right on your picture.
Rocky Maine
Member
Thanks, I have output!
And many thanks to @Weeb Labs for creating this project and for your support.
I'm a retired QA analyst who was good at finding broken things but relied on others to fix them.
Rocky Maine
Member
Yes, it works. I just tested this.
iPad with camera adapter.
Power in via lightning cable.
USB out to Pico2.
Optical out to FiiO DAC with USB wall wart.
Line out from DAC to preamp.
Planet Claire played in Tidal app on iPadOS played through my system.
What GPI0 will this be on when it's released? I have some free time tomorrow morning and would like to get this wired in.We now have working SPDIF input.
View attachment 514041
This is currently experimental but a production ready implementation is never too far away.
- Thread Starter
- #637
It will be on GPIO 11 by default and will be assignable. I will be pushing the relevant commits to a new SPDIF input branch while I sort out the clocking complexities.
EDIT: The refactor branch has now been merged to main and I have updated the naming scheme within the project structure.
I have decided to expand the existing pin assignment functionality to encompass much more than just audio pins. Volume controls, tone controls, state toggles for functions (loudness compensation, crossfeed), channel mute toggles, channel gains, delays, three channel stereo (we'll talk about this one later) and more.
A standardized I2C interface for offloading external control and UI (LVGL) to dedicated MCUs such as ESP32-S3 and similar.
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That is very respectable, thank you for pointing out. I would assume that they used the 8 outputs of the chip go obtain 4 output channels, either by paralleling or by driving them with opposite phase and doing a differential to single ended conversion. There are suspiciously few op amps on that board so it is possible that the filters are entirely passive. That would mean a stunning quality of the on-chip op amps.Amir tested when the 2x4 had the old old AKM chip.
miniDSP 2x4 HD (DDRC-24) V2 simple measurement and teardown pictures
Since Amirm has reviewed miniDSP 2x4HD, there is new V2 version with different DAC/ADC chip (probably due to AKM fire), seems no one has published the measurement data and pictures of internal components, so I make some simple measurements and teardown. I am new to audio measurement field, so...
Here is the 2x4 v2 with the correct TI chip. 102 dB SINAD and 108 dB SNR. I think acceptable for a chip that can populate the full 8x outputs.
What would the best outputs be for an IO board? Personally I would think: 2x TRS input, 4x TRS output channels 1-4, 2x RCA output channels 5-6, 1x 3.5mm headphone jack behind a pair of BUF634 channels 7-8.
Last edited:
When will the SPDIF input be released?We now have working SPDIF input.
View attachment 514041
This is currently experimental but a production ready implementation is never too far away.
