Hi again! Now I'm trying to run Najda Under Control, but the board isn't recognized by my computer running win xp. When I connect the board, windows is asking for drivers etc and when I press Connect in Najda Under Control there's a message saying "Error while attempting to connect. Pleasee make sure Najda board is connected to your computer and powered on, then try again." Maybe win xp isn't supported? Or are there some drivers that is needed?
So potentially I could run multi-channel PCM from a DVD player, over the I2S, giving a surround sound preamp.
Saying that, the existing coax/optical inputs will accept a multi-channel signal?
Without a (software) input mixer I don't see how the multichannel I2S inputs could be of any use. A single bclk/lclk for all the inputs is fine.
Is there anything we should do to have Najda consider adding this feature?
As a minimum, input mapping could be specified using a simple text config file, no need to implement a sophisticated GUI if programming resources are limited
Hi Uwe,
External PSU is fine, no problem at all.
I think you're right about the minimum load: the power supplies are probably out of specs if the minimum load condition is not satisfied.
Overvoltage on the 5V line is dangerous if you exceed 5.5V. Indeed, the 5V supply powers all digital chips (micro, SPDIF transmitter, glue logic) and most of these chips won't like anything above 5.5V.
Overvoltage on +/- 12V lines is less critical because most of the current drawn here goes through regulators.
WinXP is supported.
Can you please check the following:
- When you plug the USB cable to Najda and your computer, the 2 SMD leds near the USB receptacle on Najda should briefly light on. That's USB device enumeration. Can you see that?
- Can you check the Device Manager in Windows and see if you find the USB FTDI chip listed there? Please check also the driver status.
Potentially we could have multichannel input over I2S. However, this requires that we decide priory what we want to do with it, because Najda is fundamentally a stereo device.
Multichannel over SPDIF is not possible. This would require a Dolby and/or DTS decoder and that's out of the scope for Najda.
I'm not sure I understand this one. Can you please give a detailed example?
Best,
Nick
When disscusing the ability to do settings in pairs you said that the obvious
pairs would be 1-5. 2-6, 3-7, 4-8 to get an equal load on both cores.
I belive that it would be nice to have the possibility to make stereopairs
that's the same as the spdif outputs as well. I do have three excellent
dac's so I will be using them. In a three way setup using the spif outputs
you will always get an uneven load anyway. As it seems now I will be using
channel 1-2 for basspanels (h/p, l/p + dipole-eq+delay) channel 5-6 for
tapped horn subs ( l/p) and channel 7-8 for the ribbons (h/p + delay).
All crossovers 4/ord LR.
Edit: No delay for the subs. I have'nt tried it yet so I might change the use
of channels.
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No that's not possible. I will be using the built in digital volumecontrol of the dacs
(BuffaloIIIse). They have different buffers/analog outputs, but are identical in all
other aspects. The gainstructure will be rougly tuned using the I/V resistor in the
"Broskie unballancer" buffers. I'm using TP's "IVY III" buffer for the subchannels.
I can control the volume of all three with one 10k-pot and I saw no
reason to exclude the volumechip from the "Najda" it may come in handy some day.
(BuffaloIIIse). They have different buffers/analog outputs, but are identical in all
other aspects. The gainstructure will be rougly tuned using the I/V resistor in the
"Broskie unballancer" buffers. I'm using TP's "IVY III" buffer for the subchannels.
I can control the volume of all three with one 10k-pot and I saw no
reason to exclude the volumechip from the "Najda" it may come in handy some day.
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When you say a priori, a guess you mean hardwired? If that is the case, I have 4 I2S streams, 7+1 channels coming from a Dolby decoder. I'd like to use two Nadja boards, 2 I2S channels each. Each input audio channel should be mapped to two outputs - as my speakers are two ways.
In theory it should be pretty easy. Is there a way to do it in Najda / can you maybe provide a fixed in/out mapping for this application?
Hmm,so maybe the built in buffert in the volume control vill degree the sound,didn´t think of that..
Plus a burnt Najda board
Thanks for making the guinea pig for us !
btw incredible prices !
BR
Jean-Louis
Now I see, you were talking about linking. I was confused with all the pairs (linking, spdif, DSP load) we have mentioned recently.
The linking is still under discussion, and the option I like the most so far is the one Jean-Claude (jcga) has suggested, which would allow setting pairs freely. The only problem now is where to locate the pairing control on the interface...I understand. Let's keep this in mind and see if more people come with similar needs. However, taking 2 Najdas for a single multichannel setup is not ideal because you can't daisy-chain 2 units, at least for now.
That's great Uwe, thanks. Please let us know how it goes.
It seems that I have developed a silicon allergi in my old days
Actually there can be many god things done with op-amps and I have heard some I
even liked a lot over the years but I can't help it, I just like the tubes
.These op's? I really don't know, I haven't started it yet
The users that has commented on SQ seems to be satisfied and maybe I'm just doing overkill here.
On the other hand, I'm aiming for fantastic and overkill seems to be working so.........
Thanks. I don't see the need to daisy-chain 2 units. I can semply feed BCLK, LRCLK + serial data of two I2S channels to one unit, and BCLK,LRCLK+ serial data of the other two I2S channels to the other unit, can't I?
It seems that I have developed a silicon allergi in my old days
there can be many god things done with op-amps and I have heard some I
even liked a lot over the years but I can't help it, I just like the tubes
These op's? I really don't know, I haven't started it yet
commented on SQ seems to be satisfied and maybe I'm just doing overkill here.
On the other hand, I'm aiming for fantastic and overkill seems to be working so.........
Unfortunately building a DSP operating in the 100s of MHz might be a bit to much with tubes despite the facts that second generation computers used said tubes (first used relays and other mechanical devices)
Unfortunately building a DSP operating in the 100s of MHz might be a bit to much with tubes despite the facts that second generation computers used said tubes (first used relays and other mechanical devices)
The power bill would not be fun, but it would keep the house warm in the winter.