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DSP Xover project (part 2)
DSP Xover project (part 2)
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Old 5th June 2018, 12:30 PM   #3261
chriss0212 is offline chriss0212  Germany
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Join Date: Sep 2005
Default LR swapped

Hi all,

yesterday i recieved 3 NOS Dac's and i connected them via i2s. Then i reroute the signal on the board to use the analog volume control. Everything is working well... except: when i reboot the najda left and right channel is swapped.

I need to switch between presets to make sure, that left and right channel is set correct. Simple reload doesn't help.

I am using these dac's:

DAC-NOS1 : Non Over-Sampling DAC, TDA1543T, I2S Input | eBay

Thanks and greetings

Christian
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Old 5th June 2018, 02:30 PM   #3262
JLOP is offline JLOP  France
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Join Date: Sep 2011
Location: Luxembourg
Quote:
Originally Posted by spalmgre View Post
There are many things to consider when setting up Najda. I hope this will help to understand the Core load.

The Core load can be seen at the Monitor screen when Najda is on line.

Core 0 and 1 can be loaded to prosess different parts of the setup. See my 3 way setup .
There is a risk that you overload Core 0 if you don't rout them as I have done.

Pairing helps you so that you can alter your EQ etc. on right and left channels at the same time.
Hi Spalmgre

I see all bass/treble are processed at the entry on the same core 0. Is this the reason than sometimes I have a Bass/Treble clip although I do not apply bass/treble corrections ?
BR
Jean-Louis
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Old 6th June 2018, 10:27 AM   #3263
spalmgre is offline spalmgre  Finland
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Location: Helsinki, Finland
The core load has to do with processor capacity and this can be seen on the Monitor screen under Status / DSP Load core 0 and 1.

"Clip Warning" shows signal level that has to do with the gain structure. Meaning that if the signal level is to hi you get some indication. It is very typical that you have fast transient that the VU type indicator "Active Ins" don't show. See page 5 and 9.

Why do your Base/Treble indicate clipping is probably related to that you send a to hi signal level in to Najda from your signal source. Remember that the dynamic of different recordings can have very different level of "spikes".

It seams that also digital signals may be to hi. I use jRiver usbe to usb Najda in. I have restricted the digital volume level to 85%. Some ripped flac files seams to contain an average higher signal level depending on the recording, mixing and postprossessing.

On page 26 is more info about the Base/Treble Settings. You can disable this feature all together. This is explained in the text. There is however reference to fig 16 and I think this is wrong. I thin it is suppose to bee fig 21.
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Old 8th June 2018, 06:38 AM   #3264
diyaudnut is offline diyaudnut  United States
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Hi is this system available for purchase any more?
Does the designer respond to support queries after buying?
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Old 13th June 2018, 05:48 AM   #3265
noviygera is offline noviygera  United States
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Support question:

My Najda developed a strange issue on only the left tweeter channel. It is hissing and sometimes making weird sounds like stati, crackling and slight beeps and high pitched noises. This comes in and out, and also is sporadic while I am adjusting the volume in the Najda app. Just one channel effected.

Anyone experience something like this?
Herman
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Old 24th June 2018, 12:49 PM   #3266
vessk0 is offline vessk0
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Join Date: Feb 2012
Hi, I have a similar problem with digitally distorted sound, easily noticebale in voices. I turn off and turn on the unit and it goes away.
Sometimes it happens almost instantly, sometimes it takes time to happen.
I see it as a hardware bug in the DSP region.
It is happening when I use FIR filters.
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Old 25th June 2018, 01:49 PM   #3267
spalmgre is offline spalmgre  Finland
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Join Date: Jan 2015
Location: Helsinki, Finland
Quote:
Originally Posted by diyaudnut View Post
Hi is this system available for purchase any more?
Does the designer respond to support queries after buying?
I did buy my Najda just some months ago.

I have always got fast response when indicating that I want to buy. I did also have some issue during delivery and also after delivery and did get fast response and a nice conversation.

I chose Najda before MiniDSP (I have the basic 4 channel miniDSP and used it before) and some other competing DSP boards and solutions. I wanted a ready to go boxed unit as I already have too many projects. And I really want to learn to measure and set up DSP gear. My main interest is now with active speakers that are DSP "driven".

Najda is developed by a private person who has used a lot of his private time with the project. When years go by things happen in life and I can only presume that the lac of visible support on forums has to do with that the developers time is spent elsewhere. Maybe there is a family or something similar.

But I and probably the majority of Najda owners like to see the upgrade to the software that has been promised to us so many times. I think that the potential of the hardware has not been used to its full extent without some added features. Maybe when sales decline that it will be a driving force to give us a new software version.
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Old 28th June 2018, 05:35 AM   #3268
lowpoke is offline lowpoke  Australia
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Location: Australia
Still trying to get my head around FIR filters. The number of taps one can devote to each channel seems to be a contentious issue. I understand more is better, especially for the lower frequencies. But I don't recall seeing anybody quote any actual numbers.

However, I found this guide while I was looking at a video on Xilica DSPs. Here's what they recommend when setting up filters on their boxes. I believe they have 1200 taps available on each output channel.

What do you guys think of these figures as a guide? Screen grab attached.
(Their chart only goes down to 210Hz. I guess in the subwoofer range you'd just be allocating the max no. of taps?)
Attached Images
File Type: png Screen Shot 2018-06-27 at 2.30.17 pm.png (334.6 KB, 203 views)
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Old 28th June 2018, 10:10 AM   #3269
Shaun is offline Shaun  South Africa
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DSP Xover project (part 2)
Quote:
Originally Posted by spalmgre View Post
But I and probably the majority of Najda owners like to see the upgrade to the software that has been promised to us so many times. I think that the potential of the hardware has not been used to its full extent without some added features. Maybe when sales decline that it will be a driving force to give us a new software version.
Quote:
Originally Posted by lowpoke View Post
The number of taps one can devote to each channel seems to be a contentious issue.
There was a promise of using decimation to optimise the use of the onboard resources, but this software never materialised. A suggestion was made for Nick to make the hardware and software open source so that the community could pursue further development of it, but there is no response from Nick. I have noticed that he is selectively corresponding with his customers (apparently only the recent ones). I tried establishing contact with him not long ago, but got no response.

Besides the unfulfilled promise of the above functionality, there is the worrying occasional reports of crashes and/or unexplained corruption of configurations.

I wish that Nick could just release the IP. It would relieve him of this burden of unsatisfied customers.
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Old 28th June 2018, 11:12 AM   #3270
lowpoke is offline lowpoke  Australia
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I agree totally agree Shaun, especially as there are people ready, willing and able to take up the cause!
Come on Nick, let us make this product the best it can be!
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