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Old 14th May 2013, 07:11 PM   #1151
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Quote:
Originally Posted by chaparK View Post
I've seen very nice things here lately, thanks all,
So the left channel is playing on the left speaker, and the right speaker is silent, is that correct? What do the input level meters show?
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.
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Old 14th May 2013, 08:41 PM   #1152
UrSv is offline UrSv  Sweden
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Not that I understand what you're trying to do but too me at least these two things look strange:

Channels 1 & 2 are swapped Left/Right compared to the other paired channels.
Channels 5 & 6 have different crossover points for HP part.

Input graphs show signals when I check.
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Last edited by UrSv; 14th May 2013 at 08:50 PM.
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Old 14th May 2013, 09:14 PM   #1153
chaparK is offline chaparK  Luxembourg
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Quote:
Originally Posted by SAC View Post
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.
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.

Quote:
Originally Posted by JLOP View Post
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
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.

Quote:
Originally Posted by Flemming J P View Post
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 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
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Old 14th May 2013, 10:30 PM   #1154
SAC is offline SAC  United Kingdom
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Thanks for your thoughts Nick. I'm in two minds as it is. Multichannel can be more trouble than it is worth, especially with HDMI everywhere holding us DIY'ers back.
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Old 15th May 2013, 08:05 AM   #1155
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Quote:
Originally Posted by UrSv View Post
Not that I understand what you're trying to do but too me at least these two things look strange:

Channels 1 & 2 are swapped Left/Right compared to the other paired channels.
That's the way my amp and speakers are wired at the moment.

Quote:
Originally Posted by UrSv View Post
Channels 5 & 6 have different crossover points for HP part.
Hmm, they should be the same, I will fix that.

Quote:
Originally Posted by UrSv View Post
Input graphs show signals when I check.
Also when using and I2S source?
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Old 15th May 2013, 09:02 AM   #1156
UrSv is offline UrSv  Sweden
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Quote:
Originally Posted by Flemming J P
Also when using and I2S source?
I'm just dry swimming so I loaded your file in the software and looked at the input graphs. Perhaps I'm not looking at the right thing.
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Old 15th May 2013, 09:35 AM   #1157
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I have a specific request - is it possible to invert phase on channels independently?
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Old 15th May 2013, 12:01 PM   #1158
UrSv is offline UrSv  Sweden
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Quote:
Originally Posted by i_should_coco View Post
I have a specific request - is it possible to invert phase on channels independently?
Yes, by clicking the plus sign at the end of each channel chain it is changed to a minus i.e. inverted.
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Old 15th May 2013, 12:08 PM   #1159
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D'oh!

Thanks.
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Old 16th May 2013, 07:22 AM   #1160
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Quote:
Originally Posted by chaparK View Post
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
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.
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