Twisted Pear Audio Support
»
Product Support
»
Digital
»
Buffalo DAC
»
Dropouts with Buffalo II and Audio GD digital interface
Rank: Member
Groups: Member
Joined: 7/12/2011(UTC)
Posts: 6
|
Hi, I'm having A LOT of dropouts with my Buffalo II Dac connected to Audio GD Digital interface via spdif. The frequency of dropouts is random. But let's say about one every 3 min., sometimes more and sometimes less frequent (from one every 30 sec. to one every 20 min.). This either on a PB G4 1.67 with 10.5.8 and on a MacBook Pro 13 early 2011 with 10.6.8 with every audio application I used (VLC, iTunes, etc.). Tried changing USB cable, usb ports, SPDIF cables, working without external Audio GD DI power adapter to no avail. Tried using a different Dac (Monica2) with same setup, dropouts gone. Tried with a different spdif source (Echo Audiofire4) but again with Buffalo II Dac no dropouts. Any suggestion, please ? Implementation: http://www.tforumhifi.co...alvolare-con-ess-sabre32All the best AF
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 5/23/2010(UTC)
Posts: 708
Location: Netherlands
Thanks: 2 times
Was thanked: 48 time(s) in 45 post(s)
|
Have you already tried the alternate firmware chip (BII product page: bottom of the page)?
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 7/12/2011(UTC)
Posts: 6
|
LeonvB wrote:Have you already tried the alternate firmware chip (BII product page: bottom of the page)? Hi, no, and I don't even know how to try it... Please let me know... All the best AF
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 5/23/2010(UTC)
Posts: 708
Location: Netherlands
Thanks: 2 times
Was thanked: 48 time(s) in 45 post(s)
|
Well, you just buy the other firmware chip and put it in instead of the default one.
From your description, I assume the interface you want to use doesn't play nice with the signal detection of the BII. One of the solutions could be to use an Arduino board to change the settings of the DPLL register, but by far the easiest is to just buy the alternate firmware and try that.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 7/12/2011(UTC)
Posts: 6
|
LeonvB wrote:Well, you just buy the other firmware chip and put it in instead of the default one.
From your description, I assume the interface you want to use doesn't play nice with the signal detection of the BII. One of the solutions could be to use an Arduino board to change the settings of the DPLL register, but by far the easiest is to just buy the alternate firmware and try that. Well, I've got an Arduino which I could use but probably it's better to change the firmware chip. OK, yes, but which are the side effects of doing this ? I think my Buffalo Dac II has a 80 mhz clock (received it on 10th of september 2010), the firmware chip change is required ? Last question: if this happens I can say that my usb to spdif inteface is jittery ? All the best AF Edited by user Tuesday, July 12, 2011 11:48:14 PM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 5/23/2010(UTC)
Posts: 708
Location: Netherlands
Thanks: 2 times
Was thanked: 48 time(s) in 45 post(s)
|
Increasing DPLL bandwidth allows more jitter to pass into the system. 2010 and earliers means an 80Mhz clock. No, the change of firmware isn't required. As you already noticed, many sources simply provide an excellent signal to the ES9018 chip, which it has no problems whatsoever with to lock onto. Using another source is also a viable option. Yes. You could look at http://hifiduino.wordpress.com/ for an example on how to set the parameters using an Arduino board.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 7/12/2011(UTC)
Posts: 6
|
Ok, I ordered the firware chip. Hope it will work then... It's strange that the Audio GD Digital Interface is Jittery... But I had no problems driving the Buffalo II with the spdif output of an Echo Audiofire 4. Wll also try to use the arduino board as soon as I understand the details. Many thanks All the best AF LeonvB wrote:Increasing DPLL bandwidth allows more jitter to pass into the system. 2010 and earliers means an 80Mhz clock. No, the change of firmware isn't required. As you already noticed, many sources simply provide an excellent signal to the ES9018 chip, which it has no problems whatsoever with to lock onto. Using another source is also a viable option. Yes. You could look at http://hifiduino.wordpress.com/ for an example on how to set the parameters using an Arduino board.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/9/2007(UTC)
Posts: 453
Location: usa
|
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 7/12/2011(UTC)
Posts: 6
|
An update, I know now from Audio GD that the Audio GD Digital Interface outputs its SPDIF stream at TTL level. Could this be a problem ? Did not assemble my Dac/pre by myself but I think we planned to use a consumer level SPDIF signal... So I think we connected the Spdif input to Spdif and Ground not D1 and Ground. All the best AF Edited by user Friday, July 15, 2011 3:33:05 PM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 8/3/2010(UTC) Posts: 68  Location: S.F. Bay Area, CA
|
Manual stated for TTL Level SPDIF connection as the following:
TTL Level SPDIF
Make sure the SPDIF switch is open. Connect TTL level SPDIF signals to D1 and GND at the input terminal block.
Good luck,
Milton
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 7/12/2011(UTC)
Posts: 6
|
Yes, I know it... But does this mean that if then I change the Digital Interface to use another USB to SPDIF converter I have to change again the terminal blocks... Perhaps is better (and possible) to use an external attenuator on the spdif signal ? Something like these: http://www.minicircuits....enuators_coax_fixed.htmlAll the best AF Audiblesoundwave wrote:Manual stated for TTL Level SPDIF connection as the following:
TTL Level SPDIF
Make sure the SPDIF switch is open. Connect TTL level SPDIF signals to D1 and GND at the input terminal block.
Good luck,
Milton Edited by user Monday, July 18, 2011 6:54:18 AM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Twisted Pear Audio Support
»
Product Support
»
Digital
»
Buffalo DAC
»
Dropouts with Buffalo II and Audio GD digital interface
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.
