From the integration guide:

"In case of I2S connection problems
Some I2S sources, in particular high resolution ones, do not play correctly with the Buffalo II DAC bo
As a result, lock problems may occur. This can be a result of the source itself or the wiring from the
source to the DAC board. Make sure the I2S wires are of equal length, and as short as they can be
(preferably below 4”/10 cm).
If one is experiencing I2S connection issues that can not be solved by improving the wiring, some DP
register settings should be changed in the DAC. An alternative firmware is available for users of eithe
plain Buffalo II DAC board or for the Volumite to alter these settings. Or one could use either the AC2
an Arduino to set these registers in the DAC.
Note: It is not recommended to use the alternative firmware if you do not experience any problems."

Look at the bottom here for the firmware chip you need: http://www.twistedpearau...om/control/volumite.aspx

An alternative is to use a controller and remove the TPA firmware chip. Look here: http://hifiduino.wordpre...-and-guide-to-hifiduino/

And there are several ongoing projects with external controllers as well as the AC2 if Russ/Brian have had the time to work on it.

Hi thanks for the post.
My cables are about max. 70mm lenght . Max length difference between them is about 15mm.
Some questions.
1.Do you have stable locking on original firmware by higher sampling rate as 384kHz?
2. Is there a big difference in sound quality between highspeed and original firmware?
regards

Abdrzej

The chip locks to the bit clock only. Try twisting the bit clock wire with the ground wire. This will provide some shielding to the bit clock signal

With my B-II, I had no problems with frequencies up to 192khz, but anything higher didnt work well. I did order a high bandwidth firmware to try and get into the 300's, but it didnt help things much either. I can say that using the high bandwidth firmware on the lower speeds (i.e. 192 and below) didnt sound as good as the normal firmware.

I'm now using a B-III in the same setup, which lets you change DPLL settings using dip switches, and I've noticed similar. Still hard to get above 300khz, and the higher the DPLL settings, the worse the sound. For now we've just settled on 192 as the highest usable frequency, and set the dip switches for the lowest DPLL that it works on consistently for best sound.

This is just my experience thus far, your mileage may vary, and the firmware might work for you, never know.

Edited by user Wednesday, October 24, 2012 7:00:21 PM(UTC)  | Reason: Not specified

Try removing the onboard firmware chip on the BII. This sets the chip to default mode. Now see if you can run your high frequency material. Also try and make your I2S connections even shorter or use tightly twisted pairs for each of the connections but in what I call psuedo grounded method. This means that for each of the twisted pair connections, the "-" conductor is grounded only at one end (at the source). Just make sure that you do have one good gnd connection between source and dac.

DPLL Bandwidth. There is a firmware option that will fix this, available on the Volumite page (don't ask why it's there... :) )

Tank you for all of the usefull posts.
I ordered highbandwith firware from TP.
I try the twisted cable connection too.

thanks

Hellow.
Analog aoutput is about 10dB lower without a chip.
But there is also much more jitter, so the quality of sound is rather pure without a chip.
I hope that with the high bandwith chip I ordered, the jitter will be not as big as without a chip.
regards