If i do not want to solder on the boars just yet and are going to use the volume on the squeezebox touch audio streamer (or volumio or picoplayer on a Raspberry Pi) are there consequences for the Najda to function properly?
I read a lot about clipping and gain settings. If i modify volume before the Najda will i encounter problems with the correct input gain settings?
I read a lot about clipping and gain settings. If i modify volume before the Najda will i encounter problems with the correct input gain settings?
Every 6dB of attenuation in the digital domain results in the loss of one bit of resolution. A low volume setting (say, 30dB of attenuation) is equivalent to discarding five bits.
hmmm... for 16bit/44.1Khz audio that is not too bad actually.
The totall loss can be limited by reducing output gain so that max volume is at max playing level. In that way playing low volume would only take 2-3 bits...
High res is maybe a problem... how audible is losing 2-3 bits?
The key question is also how good is the dac on Najda. Can it match my current Audio-GD 19 (uses 2 Burr Brown PCM1704UK dacs) if so i can use it all on analog output...
The totall loss can be limited by reducing output gain so that max volume is at max playing level. In that way playing low volume would only take 2-3 bits...
High res is maybe a problem... how audible is losing 2-3 bits?
The key question is also how good is the dac on Najda. Can it match my current Audio-GD 19 (uses 2 Burr Brown PCM1704UK dacs) if so i can use it all on analog output...
It isn't. Have you come across any actual recordings with a dynamic range above 96 dB?
well that does it...
There are different options to try. In the end i could add a gain stage after the Najda or route the signal into the analog volume chip as the ultimate solution.
For me this project is like a many options to develop thing and is not meant to be finished in a month or so.
Already ordered a power supply, Najda and extension board will follow 🙂
There are different options to try. In the end i could add a gain stage after the Najda or route the signal into the analog volume chip as the ultimate solution.
For me this project is like a many options to develop thing and is not meant to be finished in a month or so.
Already ordered a power supply, Najda and extension board will follow 🙂
you are right, I have no direct evidence to say which one is better.
the reason why I didn't considered to go with stock DAC is because when I got Nadja I owned already the Buffalos.
I've only considered the technical spec of stock DAC and comparing these numbers with BII's I took that decision.
I don't know if I made the right choice, but I'm very happy with this configuration.
But the most important thing is that I had the possibility to fed my DIY soul....🙂
Has a detailed cutout sheet released for the front control panel yet? One that has the sizes for the screen/buttons/leds/etc.
I can find one for the rear panel but not the front.
PS. Loving the Najda DSP. Thanks again to ChaparK for such a great design. Currently trying a few different opamps. Liking the OPA2134AP. Have a set of MUSES 8920 coming which I am curious how they are.
Did I also read some Najda user has replaced the output caps (Elna Silmic II) with a WIMA film cap and noticed improvements ? Can't seem to find the post relating to that.
I can find one for the rear panel but not the front.
PS. Loving the Najda DSP. Thanks again to ChaparK for such a great design. Currently trying a few different opamps. Liking the OPA2134AP. Have a set of MUSES 8920 coming which I am curious how they are.
Did I also read some Najda user has replaced the output caps (Elna Silmic II) with a WIMA film cap and noticed improvements ? Can't seem to find the post relating to that.
Don't know about the panel. There is also a topic for a group buy of a complete case... allthough there is not much response lately: http://www.diyaudio.com/forums/digital-line-level/242413-dsp-xover-najda-panels.html
Like to hear your results with the opamps!
Here you find a post with a cap switch: http://www.diyaudio.com/forums/digi...p-xover-project-part-2-a-246.html#post4115586
DAC
Hi all
I just listen to the Nadja i bought from tommygun.
The Apple Remote control works like charm and is very responsiv, i like that.
I now have listen to my rebuilded Wilson Watt Puppy 5 with just 2 Channel pass through for external DAC and Volume control.
I will not use Nadja for the Watts later, the Watts are just one of my Reference, i alway have available plugnplay
The sound of this DAC and VolumeControl "Pre" is VERY GOOD 🙂
I am used to miniDSP 8x8, which is also in Compare.
I needed a more friendly Pre/DSP, which Nadja does much more confortable.
One of the coolest Project since Long time...
Best regards
Martin
PS:
If you want to use the Nadja DSP, dont waste your time with trying other DACs, they do the Job perfectly and there are lots of other Point where you can gain much more in inproving your Sound Quality.
Hi all
I just listen to the Nadja i bought from tommygun.
The Apple Remote control works like charm and is very responsiv, i like that.
I now have listen to my rebuilded Wilson Watt Puppy 5 with just 2 Channel pass through for external DAC and Volume control.
I will not use Nadja for the Watts later, the Watts are just one of my Reference, i alway have available plugnplay
The sound of this DAC and VolumeControl "Pre" is VERY GOOD 🙂
I am used to miniDSP 8x8, which is also in Compare.
I needed a more friendly Pre/DSP, which Nadja does much more confortable.
One of the coolest Project since Long time...
Best regards
Martin
PS:
If you want to use the Nadja DSP, dont waste your time with trying other DACs, they do the Job perfectly and there are lots of other Point where you can gain much more in inproving your Sound Quality.
Attachments
Listening to the stock dac is the first i am going to do. Would love to sell my old dac if the Najda sounds better. That would give me a nice budget for further upgrades 🙂
Hi shutdown,
we listened Najda against very expensive Audionet dac. Najda sounds a little better!!!
we listened Najda against very expensive Audionet dac. Najda sounds a little better!!!
Are you talking about a Audionet DNC? That is a >€5k dac 😛
Did you do modifications on the Najda?
Well... at this point i am waiting on my new soldering station. When that arrives i can put together the control board and have a go at it.
Got this power supply from the usa http://www.diyaudio.com/forums/digital-line-level/234773-najda-builds-resource-list.html#post3479283
Thanks SAC for that topic!
Also ordered a WaveIO board since there are a lot of Najda owners (and others) very positive about it, that should arrive in about 3 weeks or so 🙂
Just shows that beyond a certain point, price has very little to do with sound quality.
Funny 🙂 most of the time I use my Najda DSP as a pre-amp/DAC with passive speakers !!
WaveIO and Najda combo are a (very) good DAC 😛
For the voltage outputs on Port o and Port1: Are the 3.3V lines on the digital PSU portion? I want to draw some mA's from there for VDD on external DACs, but not pollute the analog voltages.
Nick, now you owe me $40US. I installed the MTW15-51212 power supply and Najda still has occasional problems waking up to go to work. The PS has been installed for about 1 week and this morning Najda refused to wake up. I had to cycle mains power to the PS.
Extra: I installed a USB relay, recommended by member MBA, to function as a computer controlled push button in parallel with the standby button. It works perfectly. Now everybody wakes up in perfect sequence (PC then Najda and amps), …most of the time.
Search ebay for USB relay (red board with blue relay and green screw terminals). Download the relay control application from the link on the ebay page. The boards are available with multiple relays and they all use the same software.
Create a script (see below) with a text editor and change the extension to .bat.
For Win7, open the group policy editor and refer to the attached pic. Double-click on Logon/Logoff and select the same file for both functions. No additional script parameters are required.
Follow the instructions included with the relay application. Use the GuiApp_English.exe (or Chinese) to determine the serial number of the relay and test it. Mine is TXQ89.
Script (filename, for example, NajdaStandbyPB.bat):
C:\USBRelay\TestApp\CommandApp_USBRelay.exe TXQ89 open 01
TIMEOUT /T 1
C:\USBRelay\TestApp\CommandApp_USBRelay.exe TXQ89 close 01
You can move the app and dll files to any folder. You can test the script by double-clicking on the filename.
Please note that the new relay has not caused the wake problem with Najda 😉
Extra: I installed a USB relay, recommended by member MBA, to function as a computer controlled push button in parallel with the standby button. It works perfectly. Now everybody wakes up in perfect sequence (PC then Najda and amps), …most of the time.
Search ebay for USB relay (red board with blue relay and green screw terminals). Download the relay control application from the link on the ebay page. The boards are available with multiple relays and they all use the same software.
Create a script (see below) with a text editor and change the extension to .bat.
For Win7, open the group policy editor and refer to the attached pic. Double-click on Logon/Logoff and select the same file for both functions. No additional script parameters are required.
Follow the instructions included with the relay application. Use the GuiApp_English.exe (or Chinese) to determine the serial number of the relay and test it. Mine is TXQ89.
Script (filename, for example, NajdaStandbyPB.bat):
C:\USBRelay\TestApp\CommandApp_USBRelay.exe TXQ89 open 01
TIMEOUT /T 1
C:\USBRelay\TestApp\CommandApp_USBRelay.exe TXQ89 close 01
You can move the app and dll files to any folder. You can test the script by double-clicking on the filename.
Please note that the new relay has not caused the wake problem with Najda 😉
Attachments
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