Hi Russ, did you ever get the problem with the 9 bit modulator fixed? I appreciate that 6 bits gave the best DNR, but would still be interested in what it would sound like with lower out of band noise. Thanks!
Oh yes. Long ago. Sorry I forgot to update.
Lets just say I found (with Dustin) that neither 6 or 9 bit quantizer settings were optimal. The quantizer settings in the Buf32S reflect this. 🙂
The is also a little trick you can do to randomize the modulators so that they are not in synch. This improves THD and DNR. I have implemented this trick as well.
Sometime I will make these settings public for now I would like to keep it private knowledge.
Cheers!
Russ
The B24 used a Pic12F675. The B32 uses an ATTiny85. I don't think the pinouts will be compatible.
The pinout are not compatible but if you use volumite for buf32S you will get the same configuration. 🙂
Thanks guys - will give me something to play with. I take it the randomizing of the modulators eliminates/reduces idle tones? I remember reading Wolfson doing something similar.
Dan
It basically causes the composition of noise to be more random instead of harmonic. This causes it to be lower in magnitude.
Thanks, I ordered the Buffalo DAC. Could you point to me where the DSD tapping off of the Denon 1920 is documented? By the way, I am really a newbie when it comes to digital. This is my first digital build. Thanks.
Hi guys, just assembled my buffalo dac. Sounds great. Now I am looking into more options such as feeding it DSD signal.
My question is, is the spidf switch easily removed? By desoldering or what way? I would like to mount an external switch. Thanks in advance.
My question is, is the spidf switch easily removed? By desoldering or what way? I would like to mount an external switch. Thanks in advance.
Hello,
I got to just scan this thread in order to find the information needed. Now, let's assume I found a way to have minimum jitter through a PCI or ethernet interface. The digital comes out from this interface in I2S, 192Khz/32 or 24bits. Is there a way to feed this to the buffalo32S and set the dac as a master? I mean, just don't use the internal jitter reduction, relocking or up sampling.
I am very intrigued of the possibility to use the 8 internal dacs in a dual mono configuration (one chip per channel) but I just want the dac to assume the signal is jitter free and no anti jitter measures are needed. Is this requiring a new firmware?
Thank you!
I got to just scan this thread in order to find the information needed. Now, let's assume I found a way to have minimum jitter through a PCI or ethernet interface. The digital comes out from this interface in I2S, 192Khz/32 or 24bits. Is there a way to feed this to the buffalo32S and set the dac as a master? I mean, just don't use the internal jitter reduction, relocking or up sampling.
I am very intrigued of the possibility to use the 8 internal dacs in a dual mono configuration (one chip per channel) but I just want the dac to assume the signal is jitter free and no anti jitter measures are needed. Is this requiring a new firmware?
Thank you!
I would not recommend that. Your could remove the switch, but remember that the signal actually travels through it.
What you want to do is not supported by the BUffalo32S board.
Still if you really want to do it it can be done. You would have to supply a synchronized master clock. And you would have to remove the on board low jitter/low phase noise clock. Then you would need to use custom firmware to disable the most desirable parts of the chip.
My suggestion is to just feed the DAC I2S and sit back and listen. 🙂
Cheers!
Russ
Rather an unusual request, isn't it? Might I prevail upon you to please check this in your copious free time? Otherwise I'll have to figure out some hideous kluge to the DSP board. Thanks in advance.
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