The only problem is that DSP cycles are rather limited in the DAC IC..
If you want to see the capabilities and limitations please download purepath software and it give you can see if the cycles are enough..
I am trying. TI's export control is also rather trying!!!
Less DSP cycles means the original method I proposed:
Satelites have a natural 80Hz rollof and then I use a 2nd order bessel filter at 120Hz (actually 116Hz due to component values).
Subs have 2nd order bessel at 80Hz and another at 120Hz.
Although this does not sum perfectly like LR4 slopes, it's damned close in amplitude terms and "perfect" in phase terms. The amplitude sum error is something like 0.5dB (cannot remember off hand if it's + or -) which is trivial compared to room effects.
Hi Dave,
OK, I got you wrong before. So you "copy" the natural roll-off of the satalite to the WF + add the LR4 filters (LP and HP) to sub and mains.
Regarding subwoofers I agree, 2 subs are better than 1 sub, but sometimes it is not possible (or position is difficult regarding room resonances) to place them in same distance as the mains, so a delay could help here.
Cheers, Jörn
OK, I got you wrong before. So you "copy" the natural roll-off of the satalite to the WF + add the LR4 filters (LP and HP) to sub and mains.
Regarding subwoofers I agree, 2 subs are better than 1 sub, but sometimes it is not possible (or position is difficult regarding room resonances) to place them in same distance as the mains, so a delay could help here.
Cheers, Jörn
Yes, strange indeed. In Volumio 2 selecting this dac does not work.
Hi Supersurfer,
I had the same problemand re-installeld volumioversion 28 juli 2016, which can detect the dddac via the hifiberry.
The kali, rpi2 and volumio works nice together on all formats, except dsd .dff higher then 128. I use de dddac psu 5v on the pins of the Kali and via the kali the rpi.
Can you play dsd 5.6 (256) and dsd 11.3 with volumio and rpi3?
Our team is checking if the DAC CLK is driven by SCK or PLL...
...@Greg Stewart -- replying from the Mambo thread... didn't want to go far off-topic there anymore...
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😀 I happened to breeze by there, just done researching that (D+PRO/Piano) & replied there-- was gonna post here also, to get your guys thoughts, just busy.
Post #35:
Allo KALI Reclocker & Raspberry Pi DACs running as Slave or Master? - Page 4
On the slave codec...we have found the below :
DAC (mux) clock source is set to 000: Master clock (PLL/SCK and OSC auto-select)
If both are present...PLL and SCK , with autoselect , we think that system will chose the PLL (still testing)...anyway time to modify the driver if thats the case.
DAC (mux) clock source is set to 000: Master clock (PLL/SCK and OSC auto-select)
If both are present...PLL and SCK , with autoselect , we think that system will chose the PLL (still testing)...anyway time to modify the driver if thats the case.
I am still waiting for the docs on specific flows... its coming.
Will be great if you guys can help of specific flows..at least for lower frequencies its possible to do lots of stuff..
Will be great if you guys can help of specific flows..at least for lower frequencies its possible to do lots of stuff..
Is it possible to supply the TI PurePath project for download as an example for those of us new to working with it?
Also, I assume the driver source will be incorporated into the kernel at some point. In the meantime are your changes available as a patchset?
Also, I assume the driver source will be incorporated into the kernel at some point. In the meantime are your changes available as a patchset?
Has anyone out there got their Piano 2.1 Dac working as a 2.2, using the settings on the latest Volumio update?
Is it possible to supply the TI PurePath project for download as an example for those of us new to working with it?
Also, I assume the driver source will be incorporated into the kernel at some point. In the meantime are your changes available as a patchset?
Yes changes are available as patches, we are working right now to have the whole kernel tree on github. Should be available today
Latest image for Volumio with Piano 2.1
http://updates.volumio.org/pi/volumio/2.031/volumio-2.031-2016-11-23-pi.img.zip
http://updates.volumio.org/pi/volumio/2.031/volumio-2.031-2016-11-23-pi.img.zip
Is it possible to supply the TI PurePath project for download as an example for those of us new to working with it?
Also, I assume the driver source will be incorporated into the kernel at some point. In the meantime are your changes available as a patchset?
I don't think we can because of the TI license... everyone should download it for themselves. It usually takes a few days to be approved.
However what we might be able to do...is to make custom flows .
Sparky with Piano 2.1
http://updates.volumio.org/sparky/volumio/2.030/volumio-2.030-2016-11-23-sparky.img.zip
http://updates.volumio.org/sparky/volumio/2.030/volumio-2.030-2016-11-23-sparky.img.zip
Latest image for Volumio with Piano 2.1
http://updates.volumio.org/pi/volumio/2.031/volumio-2.031-2016-11-23-pi.img.zip
Do we have to download the new image and write it to an SD card or can we just hit "Update" on our Volumio installations and get the same result?
I don't think we can because of the TI license... everyone should download it for themselves. It usually takes a few days to be approved.
However what we might be able to do...is to make custom flows .
I have the PurePath Studio software downloaded and approved from TI.
It's the project files that you load into PurePath Studio that I'm interested in.
Do we have to download the new image and write it to an SD card or can we just hit "Update" on our Volumio installations and get the same result?
"Update" worked OK for me. I'm using the Stereo Piano DAC though, not the 2.1.
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Do we have to download the new image and write it to an SD card or can we just hit "Update" on our Volumio installations and get the same result?
I think its best to do a new image..
Latest review of our DACs .
https://community.roonlabs.com/t/allo-reclocker-dac-amp-for-raspberry-pi/16263
https://community.roonlabs.com/t/allo-reclocker-dac-amp-for-raspberry-pi/16263
Any news on being able to supply the Purepath GDE .pfw files?
Also, any news on the patch set for the kernel?
Also, any news on the patch set for the kernel?
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