Rank: Advanced Member
Groups: Member
Joined: 8/14/2008(UTC)
Posts: 43
Location: UK
|
Link added to ground and now working perfectly with external XO !
Sounds quite lovely if I do say so myself;-)
Roll on the Counterpoint and Placid :d/
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 8/14/2008(UTC)
Posts: 43
Location: UK
|
Hi Russ, Are you still using the IVY configured to this? http://www.diyaudio.com/...932&stamp=1224629138I presume we can try it out even with using the line out rather than balanced? I have some spare 4n7 Evox PFR caps so was tempted to try it out if its suitable, I could easily bypass R17-20 Would a 100k need fitting across the OPA1632 +/- outputs or was that added for the sim? Cheers, Leo
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
Absolutely. I am listening to it. It sounds great. Yes, the mod works the same for either output. The 100K was for Simulation purposes only. The cap value can be 4.7n or 10n as stock. Yes I would go ahead and bypass the R17-20. Cheers! Russ Edited by user Wednesday, October 22, 2008 11:10:10 AM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 8/14/2008(UTC)
Posts: 43
Location: UK
|
Thanks Russ, I'll give it a go, not sure how good the Evox PFR's are, their polypropylene film and foil so maybe ok BTW I'm always up for trying any tweaks, within reason of course  Cheers, Leo Edited by user Wednesday, October 22, 2008 12:30:36 PM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
They are actually a great choice for the application.
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 8/14/2008(UTC)
Posts: 43
Location: UK
|
Russ White wrote:They are actually a great choice for the application. Great, I'll stick the iron on then
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 8/14/2008(UTC)
Posts: 43
Location: UK
|
Its done! Its a little late for trying through the Hi-fi + speakers so I used the GSP Solo Headphone amp and headphones I first listened with standard Buffalo1 settings, then removed the 10n's and fitted 4n7 to C1-4 and 4n7 to C13-16 and linked out R17-22 First impression, well you have to be stone deaf not to hear the difference! to my ears theres less HF energy, some tracks before (mainly busy ones) could go bright , the mids now are more forward but also sweeter, intruments are now further back. The sound seems more full if you know what I mean Is it better? well I'll leave it in a few days and listen some more but so far (through the headphones at least) it sounds very nice so I'd say initial impressions are good guys Is 4n7 optimal here ? Edited by user Wednesday, October 22, 2008 1:50:33 PM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
My calculations suggest the the value is not very critical 4.7 or 10n should be equally good. The only key is that it be a good quality non-microphonic(not ceremic!!!) type cap. Very glad you seem to like it. The Frequency response should be roughly the same, but definitely less harsh. Edited by user Wednesday, October 22, 2008 1:54:02 PM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 8/14/2008(UTC)
Posts: 43
Location: UK
|
Its certainly altered the highs, although its not as bright as before the details are still there, I can now hear more upper mids, maybe the highs before was distracting  The caps I fitted are all Evox PFR, although they are film I'm not sure if they need a bit of time to settle into the curcuit as with most new parts. I mainly asked about the 4n7's because I have enough 10nf's too, I could have used those if that value was more optimal. So far ,its definitely not worse sounding Russ so thanks for sharing, anything else to try any time just let us know;) I just hope others try it and report results
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
I would leave the 4n7.
Give it a while.
FWIW I definitely noticed my DAC was less bright too, but definitely in a nice way. I think the TIM distortion was showing up as glare. This mod should totally eliminate that.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 9/2/2008(UTC)
Posts: 53
Location: Sydney, Australia
|
Russ,
I got one of those cheap CS8416/CS4397 DACs. The differential output of each channel straight out of the DAC should be sitting at about 2.5v DC above ground. If I feed the IVY with the outputs straight out of the DAC, do I need caps in between the DAC and IVY to remove the DC or would the IVY remove it for me since it is fully differential?
Similar to connecting the OPUS to the IVY without the output electrolytics capacitors I guess.
Thanks
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 8/14/2008(UTC)
Posts: 43
Location: UK
|
I also have one of those cheapo dacs which I've modded, the coupling caps on the dacs differential output pins shouldn't be needed, I'd wait for Russ to confirm though
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
No caps needed into the IVY so long as the common mode voltage is within the limit set in the opamp spec sheet (which is pretty high, more than 4V).
Cheers!
Russ
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 8/14/2008(UTC)
Posts: 43
Location: UK
|
Hi Guys, Just a quick question this time if you don't mind Does the VA socket on the Buffalo provide a supply for the onboard LM4562 pin8 only? does it supply anything else? Cheers, Leo
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
It only supplies the opamp. :)
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 8/14/2008(UTC)
Posts: 43
Location: UK
|
Russ White wrote:It only supplies the opamp. :) Thank you Russ! Cheers Leo
|
|
|
|
|
|
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.
