hypex ncore - Page 700 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Vendor's Bazaar

Vendor's Bazaar Commercial Vendors large & small hawking their wares

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 20th July 2013, 03:16 PM   #6991
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by judderod View Post
If I run an additional connection between J1:5 of each amp, I'll create 'triangle' grounding (if there is such a thing).
So don't!

Quote:
Since the standby current is so low, and there should only be current flowing when the amps are on standby, are we saying its OK to strap 0v of the standby psu to ground of the source? That way the return path for the standby current is the shield of the single ended cable. Then I connect J1:1 of each amp together with a single wire, which is connected in the middle to an SPST relay that switches the +v standby signal?
Is your standby psu grounded? If so, your 0v is already connected to ground, and no additional ground connection is needed. If not, connect 0 v to J1:5 to *one* amp, still no ground loop.
__________________
"To try to judge the real from the false will always be hard. In this fast-growing art of 'high fidelity' the quackery will bear a solid gilt edge that will fool many people" - Paul W Klipsch, 1953
  Reply With Quote
Old 25th July 2013, 10:27 PM   #6992
miero is offline miero  Czech Republic
diyAudio Member
 
Join Date: Jun 2011
Location: Prague
I'm trying to find information about a settling time for NCore, but it is not mentioned in official materials or this thread.

I've found a requirement that it "must be less than 1s (microsecond), to maintain high quality audio" -- KV2 Audio

Have anyone tried to measure settling time for NCore?

EDIT: I've found something in AES118BP whitepaper from 2005 at page 5 suggesting it might be around 20us, but this is old paper and NCore might be different.

Last edited by miero; 25th July 2013 at 10:42 PM.
  Reply With Quote
Old 25th July 2013, 10:43 PM   #6993
diyAudio Member
 
Join Date: Mar 2004
Location: At the output stage
Send a message via Yahoo to mr_push_pull
to my best knowledge, no independent measurements of NCOREs are available as of yet. Bruno does not believe in the relevance of square-wave response. FWIF I don't either.
that webpage kind of reminds me of those "a very well hidded secret about weight loss" ads.
and remember that there's a 400kHz carrier always riding on your signal, kind of makes you wonder about the relevance of 1us settling times. the FR plot of the NCORE (the small post 20kHz bump) indicates that there is some ringing, if that helps you in any way.
I'd stay away from webpages telling you that the response to something that never actually exists in music is relevant, but that's just me and my opinion.
__________________
we all love a good ol' stereotype until it's against us
  Reply With Quote
Old 25th July 2013, 11:24 PM   #6994
miero is offline miero  Czech Republic
diyAudio Member
 
Join Date: Jun 2011
Location: Prague
I've found two reviews from USA Tour of NC400 that suggest there might be a problem with shortened/blurred decays of instruments:
- "Its almost like the Ncore sound is too fast and leaves the stage before the notes have time to 'shimmer' away in the distance. I feel as though the Ncore shortens the decay time of the instruments, resulting in a slightly smaller music space."
- " That said, and despite other things the Ncore does well, I find its presentation a little flat, and leaves me wanting more. It's as if the Ncore, like you said, drops the finer leading edges of the music---almost as if I'm listening through a cloth that veils high frequency decay, ambiance and subtle detail."

Source: Hypex NCore NC400 - USA Tour Listening Impressions
  Reply With Quote
Old 25th July 2013, 11:38 PM   #6995
diyAudio Member
 
Join Date: Mar 2004
Location: At the output stage
Send a message via Yahoo to mr_push_pull
I think you are trying to relate two things which aren't so. I have no reason to believe that a shortened decay correlates with settling time, it's just an "antropomorphic" way to view things. IMO that could be a matter of frequency response and/or distortion. also, that is a stranger's opinion which might be just personal preference. you'll only know if you listen to it yourself.

one more thing. at some point I think that Bruno said something along the lines of being reluctant to post square wave plots because they are often misiterpreted. we should all remember 2 things. first is that you can make a very simple circuit with 2 passive components (I'll leave you to guess what it's called) which displays a "ringing" behavior in response to square wave signals, but manages to pass sines completely unaltered. second is that as long as you're feeding the amp the output of a CD player, the "worst" thing that it will ever output is a peak-to-peak 22.05kHz sine. so maybe it's better to look at an amp's behavior in response to something that resembles what your CD player outputs when it's not malfunctioning (and that is not fast-slewing sines).
__________________
we all love a good ol' stereotype until it's against us

Last edited by mr_push_pull; 26th July 2013 at 12:05 AM.
  Reply With Quote
Old 26th July 2013, 12:32 AM   #6996
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 102
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
Quote:
Originally Posted by miero View Post
I've found two reviews from USA Tour of NC400 that suggest there might be a problem with shortened/blurred decays of instruments:
IMO what's being reported there has nothing to do with settling time. Its modulation noise - the leading edge softening effect is the same as given by analogue tape to the abrupt percussive sound of a firmly struck piano key.
__________________
No matter if we meanwhile surrender every value for which we stand, we must strive to cajole the majority into imagining itself on our side - Everett Dean Martin
  Reply With Quote
Old 26th July 2013, 12:46 AM   #6997
fas42 is online now fas42  Australia
diyAudio Member
 
fas42's Avatar
 
Join Date: Jun 2012
Location: NSW, Australia
Blog Entries: 11
Quote:
Originally Posted by miero View Post
"Its almost like the Ncore sound is too fast and leaves the stage before the notes have time to 'shimmer' away in the distance. I feel as though the Ncore shortens the decay time of the instruments, resulting in a slightly smaller music space."
This is a classic distortion artifact, often associated with digital reproduction. It may be hard to track down the precise cause and effect, but is most certainly something in the overall reproduction system that is misbehaving ...
__________________
Frank the truth is, I just like a bit of ASMR ...
  Reply With Quote
Old 26th July 2013, 12:53 AM   #6998
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 102
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
The symptoms do rather sound like power supply noise is creeping in. I'd suggest making a recording of the power supply noise while playing out music as I've done here: Possibly the most frugal high-end sounding amp? - Page 3
__________________
No matter if we meanwhile surrender every value for which we stand, we must strive to cajole the majority into imagining itself on our side - Everett Dean Martin
  Reply With Quote
Old 26th July 2013, 05:16 AM   #6999
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by miero View Post
I've found a requirement that it "must be less than 1s (microsecond), to maintain high quality audio"
You might have noted that there is a specific section in the nc400 datasheet with "frequently asked numbers" that don't influence sound quality directly...
__________________
"To try to judge the real from the false will always be hard. In this fast-growing art of 'high fidelity' the quackery will bear a solid gilt edge that will fool many people" - Paul W Klipsch, 1953
  Reply With Quote
Old 26th July 2013, 06:20 AM   #7000
miero is offline miero  Czech Republic
diyAudio Member
 
Join Date: Jun 2011
Location: Prague
regarding the low settling time ... it might be important for playing DSD(SACD) ... and maybe for HD PCM too, e.g. 176.4kHz
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hypex problem, who can help Hansms Class D 9 18th August 2013 06:49 AM
Hypex steveww Class D 14 18th November 2010 01:44 PM
Question for those who have tried hypex smps with hypex modules avian Class D 12 3rd March 2009 09:30 AM
Hypex UcD 180AD + signal wires, Power Supply ST, Hypex Transformer TR100A c10h12n2 Swap Meet 7 7th July 2007 03:55 PM
FS: Hypex UcD 400/180AD, hypex toroid Archmage Swap Meet 4 14th November 2006 04:23 AM


New To Site? Need Help?

All times are GMT. The time now is 02:33 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2