Nick,
1st point
Current analogue and spdif inputs being stereo is irrelevant to me since I would expect to pass multichannel audio over usb (or even multiple spdifs - 8 channel spdif output from bluray player - Audiopraise :: Specialist in digital electronics and signal processing) and connect to Najda by I2S, bypassing the current connectors.
2nd point
I would want to use the Najda for processing my stereo speakers (8channels), the other 6 channels (14 outputs with expansion board) on just pass through (though with volume control). Is that not possible?
3rd point
14 channels (on analogue) is indeed just short of the ideal, though where do we draw the line? Someone with 7.1 and three ways would need 22 channels!!! Popular NaoNote and LX521 set-ups are four way, giving 29 channels.
Personally, at a minimum, I want 8 channels for my four way stereo speakers, and another 2 at least for full range surround channels, totalling 10.
Those with all 2-ways could do 5 channel just on the existing 10 analogue outputs - L2 (channels), R2, C2, RL2, RR2.
Hi UrSv
Would you mind publishing the PCB drawings so that we avoid redesigning them ? I guess one face easy to replicate.
Could be in the resources as well !
Thanks
Jean-Louis
Cease fire guys
! I am lost in all the input and outputs and their limitations/capability, it's probably me but maybe a little drawing of different I/O capabilities with expansion board would make things easier (same as the one that exist on WAF-Audio site, but expanded) ?And btw all these these I/O will require holes on the rear plate, it's easier to drill upfront and leave the holes empty or just covered with a mask than after having the boards assembled. It would be good we have a clear idea now.
Nick, I take your point about limited I2S length, but I had in mind that distance could go in the tenth of cm (of course not m), I think there are commercial products with I2S in and out. At one moment, if we want top-notch DACs x 5 or 6 channels, it will not get inside a 1U or 2U case and we need another case probably, and connexion to it
BR
Jean-Louis
Hi Jean-Louis, I am getting mixed up myself. I said there were 10 analogue outputs currently at the end of my last post, when there are only 8.
The way I see it is;
Expansion board potential
Expansion port 0 (6ch in or out) – pending software/firmware
Expansion port 1 (12ch in or out) – pending software/firmware
Najda chip processing (multi-channel bottleneck it seems)
Limited to 10 channels
Current analogue output
8 channels
Output expansion board format
Spdif (extra 3 ports) = 6 extra channels >>Total output 16 digital channels
Analogue (extra 6 ports) = 6 extra channels >>Total output 14 analogue channels
The way I see it is;
Expansion board potential
Expansion port 0 (6ch in or out) – pending software/firmware
Expansion port 1 (12ch in or out) – pending software/firmware
Najda chip processing (multi-channel bottleneck it seems)
Limited to 10 channels
Current analogue output
8 channels
Output expansion board format
Spdif (extra 3 ports) = 6 extra channels >>Total output 16 digital channels
Analogue (extra 6 ports) = 6 extra channels >>Total output 14 analogue channels
I agree with you absolutely! Daisy chain would be the best alternative, thus avoiding the reduction of correction models power and implementation of FIR crossovers or room correction. Last point in my opinion is more important than having access to 14 or more channels
I have a VFD coming in soon hopefully. I'll report back as soon as I have any info.
Nothing on the right channel according to the meters.
I noticed that currently core 0 is at 43% and core 1 at 101%. before the last update and my USB attempts both cores was at 4x%
I have included my config.
I'll first make available a 2-channel analogue output expansion that we have already discussed. This will increase output capability to 10 channels for those who need that many in a stereo setup.
We can of course talk about multi-channel use of Najda, but this will come later if ever because at this stage there are too many contradictions.
Someone here had posted here the idea of sync'ing 2 boards. This would make 16 channels plus provision for 4 more. Input would be 4-channel I2S on each board.
Alright, I understand. The fact is, if you take a general public data transmission standard, then you get clear specifications. So according to the standards, a basic USB cable shouldn't be longer than 5 m and similarly an optical cable shouldn't exceed 10 m: you know where you're going.
With I2S, there's nothing like this. The only way you can know for sure is to give it a try.
I have already heard from Siegfried about Core 1 overload.
I'll be back in the lab on Monday evening. Please wait until then when I can try for myself, I'll be back to you on this issue. Thanks.
Nick
That's the way my amp and speakers are wired at the moment.
Hmm, they should be the same, I will fix that.
Also when using and I2S source?
Yes, by clicking the plus sign at the end of each channel chain it is changed to a minus i.e. inverted.
If i disconnect the source for my USB receiver and use the analog input core 1 load is fine.
As soon as I connect something to the USB receiver core 1 begin to peak at 101%
When I begin to send music through the USB, core 1 stays at 101%.
So I guess the core 1 overload issue has something to do with the I2S input.