Thanks Nick,
I fear the HDMI option is not workable. I2S is a signal it sounds like, whereas I thought it was describing just the hardware, and therefore the following link may be applicable here;
DAC-2 I2S Input - Frequently Asked Questions - WYRED 4 SOUND
"The DAC-2 I2S input is specifically for a balanced I²S signal and will not work with standard HDMI outputs that you will find on electronics such as some TVs, Audio Video Receivers, DVD players, etc."
Nonetheless, I am still interested in this board. Was thinking two Minidsp 2X4 for my four-way active speakers, but the Najda seems better quality, a preamp thrown in, and ultimately costing similar money for a lot more.
However, would like to build the Nao Note II so was a bit disappointed the Najda did not tick all of John Krekovskys' boxes;
"However, the limitations on gain of 12dB for EQ sections makes it impossible to get the exact transfer function for the woofer.
Additionally, the PEQ Q values can only be set to 1 decimal point while 2 are required for accuracy.
Lastly, since the PEQ Q definition is different that the analog version (like miniDSP) it's a trial and error setup. For miniDSP I have software that generates the biquad coefficients based on the analog Q which is how I design."
http://www.diyaudio.com/forums/multi-way/221948-nao-note-ii-rs-7.html#post3443285
I fear the HDMI option is not workable. I2S is a signal it sounds like, whereas I thought it was describing just the hardware, and therefore the following link may be applicable here;
DAC-2 I2S Input - Frequently Asked Questions - WYRED 4 SOUND
"The DAC-2 I2S input is specifically for a balanced I²S signal and will not work with standard HDMI outputs that you will find on electronics such as some TVs, Audio Video Receivers, DVD players, etc."
Nonetheless, I am still interested in this board. Was thinking two Minidsp 2X4 for my four-way active speakers, but the Najda seems better quality, a preamp thrown in, and ultimately costing similar money for a lot more.
However, would like to build the Nao Note II so was a bit disappointed the Najda did not tick all of John Krekovskys' boxes;
"However, the limitations on gain of 12dB for EQ sections makes it impossible to get the exact transfer function for the woofer.
Additionally, the PEQ Q values can only be set to 1 decimal point while 2 are required for accuracy.
Lastly, since the PEQ Q definition is different that the analog version (like miniDSP) it's a trial and error setup. For miniDSP I have software that generates the biquad coefficients based on the analog Q which is how I design."
http://www.diyaudio.com/forums/multi-way/221948-nao-note-ii-rs-7.html#post3443285
Hi Nick,
I'm also on the verge to update my system and I will be also building the Note II RS. I would also like to go with your DSP board since it seems more powerful and it offer me more flexibility then the MiniDSP board for how I will be hooking my system (dac preamp multiple source etc...)
But I really need what JohnK needs to use your board. witch are
1. limitations on gain of 12dB for EQ sections
2. PEQ Q values can only be set to 1 decimal point while 2 are required for accuracy
3. possibility to generate your own Biquad filter which is how I intend to program my DSP....
I'm sure those request could be implemented easily. JohnK is a well respected loudspeaker designer and your board will sure be sold more if you can manage a fix for this....
Thank you
J-P
I'm also on the verge to update my system and I will be also building the Note II RS. I would also like to go with your DSP board since it seems more powerful and it offer me more flexibility then the MiniDSP board for how I will be hooking my system (dac preamp multiple source etc...)
But I really need what JohnK needs to use your board. witch are
1. limitations on gain of 12dB for EQ sections
2. PEQ Q values can only be set to 1 decimal point while 2 are required for accuracy
3. possibility to generate your own Biquad filter which is how I intend to program my DSP....
I'm sure those request could be implemented easily. JohnK is a well respected loudspeaker designer and your board will sure be sold more if you can manage a fix for this....
Thank you
J-P
Alright, this is interesting feedback and I'm quite happy that there's a forum to discuss about these matters.
Regarding gain on EQ, I can actually set it to any number straight away. It's just a constant in the software and I've set it initially to 12 dB because it seemed safe for less experimented users. Just tell me how much gain you need and I'll make this available, no problem.
Regarding Q factor with 2 decimal points, no problem neither. I put it in the pipeline.
Finally, and I think this is your last point, custom biquads is already being looked at, that's part of the next release, coming soon (with FIR/IIR mix).
Thanks for reporting your concerns, that's how I can make Najda better.
Best,
Nick
Nice, the FIR/IIR mix will let me experiment FIR global phase correction !
About the 12 dB max, in fact you have a 24 dB range already (+/- 12 dB) but I understand that in some rare case you need more than that.
Jean Claude
JohnK had this to say;
"that depends of the design of the woofer system. For example, depending on which woofer is used and what the cut off frequency is, in one of my dipole woofer systems I need A Q PEQ boost of anywhere between 11 and 22dB. "
http://www.diyaudio.com/forums/multi-way/221948-nao-note-ii-rs-7.html#post3451218
Well,
I have all the parts on order now except the case but I will wait with that until I have everything tested out. It's fibreboard until then.
I ended up ordering this display:
OLED Display
I'm waiting for the WaveIO board from Lucian as well which I will integrate via the I2S input so that's another datapoint for the I2S once I get it configured.
I have looked at this page:
OP amps
I'm tempted to just order some NJM4562's and be done with it since they are measured to actually perform better than the LM833.
Nick, would that be a drop in replacement?
Great to hear about the custom biquads since that's another requirement from my side.
I have all the parts on order now except the case but I will wait with that until I have everything tested out. It's fibreboard until then.
I ended up ordering this display:
OLED Display
I'm waiting for the WaveIO board from Lucian as well which I will integrate via the I2S input so that's another datapoint for the I2S once I get it configured.
I have looked at this page:
OP amps
I'm tempted to just order some NJM4562's and be done with it since they are measured to actually perform better than the LM833.
Nick, would that be a drop in replacement?
Great to hear about the custom biquads since that's another requirement from my side.
This thread might be of interest:
http://www.diyaudio.com/forums/digital-line-level/215529-python-open-room-correction-porc.html
http://www.diyaudio.com/forums/digital-line-level/215529-python-open-room-correction-porc.html
They're talking about EQ corrections not level adjustments.
The shelving filters are limited (currently) to +/-12db gain, but you can cascade (add) sections to achieve dipole corrections (or whatever else) of greater than 12db.
If Nick were to change the software to allow >12db settings for the filters it won't improve the situation with regard to gain structure.....but it will make it a bit more straightforward to program......at least with the "free routing" scheme.
Cheers,
Dave.
I decided to do a little beautification project on the interior today. After wrestling the wires into neat packages the LCD was displaying weirdly. I checked the connections and gave them all a little love squeeze. All is back to normal. Nick, On the next board please make the numbers for the LCD linear. 1 thru 8 in a row and 9 thru 16 in the other. The LCD's I bought are all in a line and it's hard to assemble all those little connectors.
Didn't read that properly. However on EQ I have have found 12dB to be about enough. I do use 12dB on the tapped horns actually, so some some head room would be good.According to what I can see on my board, and even without the schematic of the analog part, it looks like Nick followed the CS42528 design sheet and therefore the CS3318 is at the very end of the chain.
Also, again for those in need of more than + 12 dB range remember that putting -12 dB on the other side is still possible...
Jean Claude
Thanks,
Yes, it looks that way. In that case I guess we won't be needing any high power opamp that is capable of driving long cable lenghts.
best,
Paal
If you need to run long cable length (as I have) I would not bet on the asymmetrical output of the Najda board.
it's just my experience but I'm on multi active loudspeakers since the early 80' and had often lots of trouble with ground loop until I switched to symmetrical connections in 1999 and... I will not come back. So when Najda software/hardware will fit my needs I will build an additional symmetrical input/output stage.
By the way, in one of your previous message, you mention Acourate. Are you using it ?
Jean Claude
Hi,
I have been running symmetrical between my preamp and my Orion ASP, but now I am moving to LX 521 and a DSP so I have moved Najda to a place close to the power amps and it is incredible quiet to my ears. I am not able to hear any noise from more than 5cm distance of the drivers.
I have had my Orions on FIR filters with brutefir/Acourate (convolver is capable of 65536 taps@48kHz in 8 channels) This works good with the driver correction. I have not had any good sucess with room correction. I guess my knowledge is the limit
Anyway, Acourate should be exellent for making filters when Nick now introduces a FIR option.
best,
Paal