hypex ncore - Page 593 - 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 13th January 2013, 11:36 AM   #5921
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by ds23man View Post
Why do people always want to change the gain? If you have high sensitive speakers, put a attenuater between your ncore and preamp!
What Is Gain Structure
  Reply With Quote
Old 13th January 2013, 11:41 AM   #5922
diyAudio Member
 
StigErik's Avatar
 
Join Date: Feb 2008
It makes a lot of sense for us that run the DAC output straight into the Ncore.
__________________
dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles
  Reply With Quote
Old 13th January 2013, 12:16 PM   #5923
ds23man is offline ds23man  Netherlands
diyAudio Member
 
Join Date: Oct 2006
Quote:
Originally Posted by StigErik View Post
It makes a lot of sense for us that run the DAC output straight into the Ncore.
Yes, and a nice big wirewound potentiometer between the amp and speaker
  Reply With Quote
Old 13th January 2013, 12:24 PM   #5924
ds23man is offline ds23man  Netherlands
diyAudio Member
 
Join Date: Oct 2006
I know what gainstructure is, been in pro audio for many years.

What I mean is the ncore has an output noise of 25uV and a signal to noise ratio of 125 db. Gain is only 26 db ( most pro audio amps are 36db). So if you get a hiss out of your speakers, the gainstructure before the ncore is wrong.

You have to solve the problem at the source!
  Reply With Quote
Old 13th January 2013, 12:32 PM   #5925
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by ds23man View Post
I know what gainstructure is, been in pro audio for many years.
I know you would know, that is why I was surprised you would ask.

Quote:
What I mean is the ncore has an output noise of 25uV and a signal to noise ratio of 125 db. Gain is only 26 db ( most pro audio amps are 36db). So if you get a hiss out of your speakers, the gainstructure before the ncore is wrong.

You have to solve the problem at the source!
There doesn't necessarily have to be a problem - but why would you on purpose give away some SNR? And Bruno has commented that the performance of the nc400 does improve a tiny bit with increased feedback (which is what you get if you lower the gain instead of attenuating the signal).

Any attenuating network will always compromise the impedance matching between source and amp to some degree. Whether it makes any audible difference is another matter, but why eschew an ideal solution in favour of an inferior one at the same cost and effort?
  Reply With Quote
Old 13th January 2013, 12:50 PM   #5926
diyAudio Member
 
Join Date: Jan 2007
Quote:
Originally Posted by Julf View Post
...but why eschew an ideal solution in favour of an inferior one at the same cost and effort?
Well, it seems that the relatively simple task of desoldering an SMD resistor can turn into a disaster for quite a few people.
Considering NC400s are not exactly affordable modules, if one is not confident with his soldering skills, he'd be better off using attenuators.
__________________
"You have a hierarchy: a mathematician, a physicist (which is a failed mathematician), and an engineer (which is a failed physicist)." - Andrew Jones
  Reply With Quote
Old 13th January 2013, 12:56 PM   #5927
ds23man is offline ds23man  Netherlands
diyAudio Member
 
Join Date: Oct 2006
Or reduce the gain of the preceding stage, the noise floor will get lower if you do that. Soldering on these modules is like Russian roulette for most of us.
  Reply With Quote
Old 13th January 2013, 01:29 PM   #5928
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by ds23man View Post
Or reduce the gain of the preceding stage
Definitely the easiest solution if there is provision for it. Many of us have sources with limited gain range.

Quote:
Soldering on these modules is like Russian roulette for most of us.
Right - but this is DIYaudio after all

I agree that people should be aware that the removal of R141 requires precision soldering and can go wrong.

I was simply responding to the question posted by ds23man, "Why do people always want to change the gain?", by pointing out there are good reasons to do it. Is it worth the risk? That's a different question.
  Reply With Quote
Old 13th January 2013, 03:11 PM   #5929
ds23man is offline ds23man  Netherlands
diyAudio Member
 
Join Date: Oct 2006
Quote:
Originally Posted by Julf View Post
Definitely the easiest solution if there is provision for it. Many of us have sources with limited gain range.



Right - but this is DIYaudio after all

I agree that people should be aware that the removal of R141 requires precision soldering and can go wrong.

I was simply responding to the question posted by ds23man, "Why do people always want to change the gain?", by pointing out there are good reasons to do it. Is it worth the risk? That's a different question.
We can put this in another way: If I have high sensitivity speakers ( 100db+), why I want to use a high power amp?
  Reply With Quote
Old 13th January 2013, 03:26 PM   #5930
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by ds23man View Post
We can put this in another way: If I have high sensitivity speakers ( 100db+), why I want to use a high power amp?
Maybe you want to be able to play really loud?

Independent of your speaker sensitivity or amp power, you might have a situation where the last 10 dB of input amplitude make the amp clip. Lowering the amp gain 10 dB still allows you to play at full volume, but gives you 10 dB extra signal-to-noise ratio.
  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 01:34 AM.


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