|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
67.60.98.130
In Reply to: RE: Buffa-Juli@... and a question for Theob! posted by theob on January 31, 2010 at 14:32:45
Theo,Thanks for the welcome and the well-wishes... I'm not quite over the flu and the back, but both are getting better & going in the right direction.
Also thanks for the info on how you got to adding the series resistors in the I2S signal lines. That all makes sense and provides a data point for whether I should do the same for this Buffalo32 implementation. I have to say I'm leaning towards not adding additional resistance.
Why? First, the Buff32 already has 22 ohm resistors in series with the data lines.
Second, the Buff32-on-top-of-Juli@ implementation means that the connections are actually shorter than the equivalent connections for the stock Juli@. For the connection from the Juli@ digital section board to the Buff32 board, it is shorter than the conductor length of the Juli@'s inter-board connectors. And the path length of the traces on the Buff32 board from where the lines enter the board to where they hit the DAC is shorter than the same lines on the Juli@ analog section.
Then third, I did not hear the type of sonic degradation with this implementation that I heard with the AK4398 and AK4399 DACs when I used them with no resistors on the I2S lines (muffled and veiled sounding).
Of course, the only way to really know for sure is to try them, which I might still do.
Again, thanks!
Greg in Mississippi
P.S. It is sounding better as it runs in... perhaps a hair more detail now than the AK4399 setup I'm using. Its also very listenable, if ultimately not as convincing and musical as the AK4399 setup. But, it's only been breaking in for 8 hours or so... more to come!
Everything matters!
Edits: 01/31/10Follow Ups:
Wackyterbacky indicates that Steve Nugent recommends removing the 22 ohm resistors on board. I never tried for fear of goofing something up on the Buf32s board. Apparently Wacky also did not remove these either although that could be a sonic opportunity. Anyway I am very happy with the I2s resistors on both ends.
Theo,
Thanks for the info.
I'd agree that removing the 22R resistors on the Buff32 board would be tricky unless one is familiar with SMD soldering. OTOH, they really just need to be bypassed which is much easier... It still takes a small-tipped iron and small-gauge solder tho. I do think that would be a performance increase in your setup and Wackyterbacky's (although I'm not sure what they look like in his DAC).
But as I understand it, the setup I'm using on this implementation is more like the original Juli@ analog board's connection to the Juli@ digital board... Except that my connections are slightly shorter. And the size and placement of the resistors on the Buff32 board are pretty close in location and value to that of the Juli@ analog board.
OTOH, the longer cable connections you and Wackyterbacky are using are a different world and require different techniques to make them work right... Hence the source-end signal resistors and removal of the destination-end resistors.
Greg in Mississippi
Everything matters!
Yes I forgot you have short i2s wires so yes you are probably there already!
Happy listening!
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: