Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Login
9 Pages123>»
DC offset playing DSD files - felipe
Options
View
Go to last post Go to first unread
Previous Topic Next Topic
felipe  
#1 Posted : Wednesday, April 8, 2015 1:03:21 PM(UTC)
felipe

Rank: Member

Groups: Member
Joined: 12/6/2009(UTC)
Posts: 323
Location: Catalonia new Europe state

Thanks: 4 times
Was thanked: 1 time(s) in 1 post(s)
Hey guys,

I have DC offset when playing DSD files, measurements done playing DSD files:

Left channel -1.6VDC Right channel -0.8VDC

TIA for support
Felipe
Back to top

Wanna join the discussion?! Login to your Twisted Pear Audio Support forum accountor Register a new forum account.
Back to top  
avr300  
#2 Posted : Wednesday, April 8, 2015 1:08:36 PM(UTC)
avr300

Rank: Member

Groups: Member
Joined: 6/17/2008(UTC)
Posts: 921
Denmark

Thanks: 1 times
Was thanked: 70 time(s) in 69 post(s)
Please check DC when NOT playing.
Back to top
felipe  
#3 Posted : Wednesday, April 8, 2015 4:19:24 PM(UTC)
felipe

Rank: Member

Groups: Member
Joined: 12/6/2009(UTC)
Posts: 323
Location: Catalonia new Europe state

Thanks: 4 times
Was thanked: 1 time(s) in 1 post(s)
It's the samed'oh!
Back to top
felipe  
#4 Posted : Wednesday, April 8, 2015 4:31:28 PM(UTC)
felipe

Rank: Member

Groups: Member
Joined: 12/6/2009(UTC)
Posts: 323
Location: Catalonia new Europe state

Thanks: 4 times
Was thanked: 1 time(s) in 1 post(s)
I have disconnected physically the RCA between Legato and the Intact Audio AVC (autoformer volume control) and there is no DC output at the Legato outputEh?
Back to top
avr300  
#5 Posted : Wednesday, April 8, 2015 5:55:00 PM(UTC)
avr300

Rank: Member

Groups: Member
Joined: 6/17/2008(UTC)
Posts: 921
Denmark

Thanks: 1 times
Was thanked: 70 time(s) in 69 post(s)
Seems like the Legato doesn't like the "aformer".

Do you have access to a scope. Perhaps the aformer makes the output of the legato oscillate? Only way to tell is to measure with a scope.

You could try to disconnect whatever comes AFTER the aformer, to see if this changes the situation.

Which DAC is in front of the Legato?
Have you considered using a Volumite, either build in (Buffalo III) or separate (Buffalo II)
Back to top
felipe  
#6 Posted : Wednesday, April 8, 2015 8:20:27 PM(UTC)
felipe

Rank: Member

Groups: Member
Joined: 12/6/2009(UTC)
Posts: 323
Location: Catalonia new Europe state

Thanks: 4 times
Was thanked: 1 time(s) in 1 post(s)
Yes I have scope, tomorrow I will measure if the AVC makes oscillate the Legato.

BIII

I have Volumite but I don't use because I don't like the sound.
Back to top
felipe  
#7 Posted : Thursday, April 9, 2015 10:53:08 AM(UTC)
felipe

Rank: Member

Groups: Member
Joined: 12/6/2009(UTC)
Posts: 323
Location: Catalonia new Europe state

Thanks: 4 times
Was thanked: 1 time(s) in 1 post(s)
I used the AVC as passive and 300 Ohm headphone to avoid grid & OPT tx and playing DSD files I still have Left channel -1.6VDC Right channel -0.8VDC, another curiosity is when I stop playing DSD files still remain the DC offset Left channel -1.6VDC Right channel -0.8VDC, only goes to zero when I play PCM files, another test done is changing the volume setting don't change the amount of DC offset so DC offset isn't related to volume setting.

I contacted Dave Slage (AVC manufacturer) because I'm sure the problem isn't of Legato stuff.
Back to top
felipe  
#8 Posted : Thursday, April 9, 2015 5:41:35 PM(UTC)
felipe

Rank: Member

Groups: Member
Joined: 12/6/2009(UTC)
Posts: 323
Location: Catalonia new Europe state

Thanks: 4 times
Was thanked: 1 time(s) in 1 post(s)
From the explaination in wikipeadia DSD files the appears to be much more more modulation of the signal and may be this is being rectified ?
Back to top
avr300  
#9 Posted : Thursday, April 9, 2015 5:54:59 PM(UTC)
avr300

Rank: Member

Groups: Member
Joined: 6/17/2008(UTC)
Posts: 921
Denmark

Thanks: 1 times
Was thanked: 70 time(s) in 69 post(s)
?

Have you tried:

Quote:

You could try to disconnect whatever comes AFTER the aformer, to see if this changes the situation.
Back to top
felipe  
#10 Posted : Friday, April 10, 2015 12:47:46 PM(UTC)
felipe

Rank: Member

Groups: Member
Joined: 12/6/2009(UTC)
Posts: 323
Location: Catalonia new Europe state

Thanks: 4 times
Was thanked: 1 time(s) in 1 post(s)
Situation without nothing connected after the AVC isn't changedr: left channel -6VDC right channel -5VDC

Edited by user Friday, April 10, 2015 12:48:35 PM(UTC)  | Reason: Not specified
Back to top
avr300  
#11 Posted : Friday, April 10, 2015 8:51:42 PM(UTC)
avr300

Rank: Member

Groups: Member
Joined: 6/17/2008(UTC)
Posts: 921
Denmark

Thanks: 1 times
Was thanked: 70 time(s) in 69 post(s)
Originally Posted by: felipe Go to Quoted Post
Situation without nothing connected after the AVC isn't changedr: left channel -6VDC right channel -5VDC


felipe wrote:

Left channel -1.6VDC Right channel -0.8VDC


I think is has changed quite a bit. Unfortunately not for the better.


Sorry, can't help you. I think your Legato is just fine. Something wired going on with the AVC.
Back to top
felipe  
#12 Posted : Monday, April 13, 2015 3:24:27 PM(UTC)
felipe

Rank: Member

Groups: Member
Joined: 12/6/2009(UTC)
Posts: 323
Location: Catalonia new Europe state

Thanks: 4 times
Was thanked: 1 time(s) in 1 post(s)
Can be the dc current coming out from the DAC plasying DSD diles is saturating the AVC core?

Could someone tell me how many max mA gives the Legato playing DSD files?

Edited by user Monday, April 13, 2015 3:27:38 PM(UTC)  | Reason: Not specified
Back to top
avr300  
#13 Posted : Monday, April 13, 2015 6:03:42 PM(UTC)
avr300

Rank: Member

Groups: Member
Joined: 6/17/2008(UTC)
Posts: 921
Denmark

Thanks: 1 times
Was thanked: 70 time(s) in 69 post(s)
Could you try one thing. Play non-DSD materiale. Is the DC now gone?

Edited by user Monday, April 13, 2015 6:04:23 PM(UTC)  | Reason: Not specified
Back to top
felipe  
#14 Posted : Wednesday, April 15, 2015 10:22:50 AM(UTC)
felipe

Rank: Member

Groups: Member
Joined: 12/6/2009(UTC)
Posts: 323
Location: Catalonia new Europe state

Thanks: 4 times
Was thanked: 1 time(s) in 1 post(s)
Yes, for example I play first DSD files and DC comes, next I play PCM files & DC is gone.
Back to top
felipe  
#15 Posted : Wednesday, April 15, 2015 10:25:11 AM(UTC)
felipe

Rank: Member

Groups: Member
Joined: 12/6/2009(UTC)
Posts: 323
Location: Catalonia new Europe state

Thanks: 4 times
Was thanked: 1 time(s) in 1 post(s)
@ Brian & Russ
A little bit of help will be appreciated.

TIA
Felipe
Back to top
Brian Donegan  
#16 Posted : Wednesday, April 15, 2015 1:17:28 PM(UTC)
Brian Donegan

Rank: Administration

Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 2,868
Location: Massachusetts, USA

Thanks: 2 times
Was thanked: 141 time(s) in 134 post(s)
What is your DSD source?

When you see the DC-offset, if you disconnect the DSD source, I assume the DC goes away?
Back to top
WWW
felipe  
#17 Posted : Thursday, April 16, 2015 4:59:12 PM(UTC)
felipe

Rank: Member

Groups: Member
Joined: 12/6/2009(UTC)
Posts: 323
Location: Catalonia new Europe state

Thanks: 4 times
Was thanked: 1 time(s) in 1 post(s)
BIII + Legato without output caps.

Yes.

I have the effect of the saturated AVC core lossing of bass only playing DSD files.
Back to top
felipe  
#18 Posted : Thursday, April 16, 2015 5:40:05 PM(UTC)
felipe

Rank: Member

Groups: Member
Joined: 12/6/2009(UTC)
Posts: 323
Location: Catalonia new Europe state

Thanks: 4 times
Was thanked: 1 time(s) in 1 post(s)
Strange now is not DC offset playing DSD files, still loosing bass playing DSD files.
Back to top
felipe  
#19 Posted : Friday, May 1, 2015 7:12:33 PM(UTC)
felipe

Rank: Member

Groups: Member
Joined: 12/6/2009(UTC)
Posts: 323
Location: Catalonia new Europe state

Thanks: 4 times
Was thanked: 1 time(s) in 1 post(s)
Brian can Legato outputs unbalanced current using SE outputs?
Back to top
avr300  
#20 Posted : Saturday, May 2, 2015 9:10:47 AM(UTC)
avr300

Rank: Member

Groups: Member
Joined: 6/17/2008(UTC)
Posts: 921
Denmark

Thanks: 1 times
Was thanked: 70 time(s) in 69 post(s)
SE output is unbalanced
Back to top
Rss Feed  Atom Feed
Users browsing this topic
GuestUser (5)
9 Pages123>»
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.

Youtube
Copyright © Twisted Pear Audio