hypex ncore - Page 564 - 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 26th November 2012, 10:54 AM   #5631
robbbby is offline robbbby  Canada
diyAudio Member
 
Join Date: Feb 2012
Quote:
Originally Posted by StigErik View Post
My Ncores are dead quiet. Always. When I put my ear onto the cone of my 98 dB efficient woofers, I can't hear any noise at all. Any HF noise would get lost, as the response of the woofers drops off above 2kHz, but anyway .....

My mid and woofers are dead silent, just noise from the tweeter. Also I get popping when cycling the amps on/off without any input connected.


Julf, good idea, somebody else mentioned double checking all connections/grounding inside enclosures.

Right now I do not have earth/ground connected to the case, should I ground the case to earth?
  Reply With Quote
Old 26th November 2012, 11:23 AM   #5632
diyAudio Member
 
Join Date: Feb 2006
Location: Athens
Robbby, have you checked the DC at the output of ncores ?
  Reply With Quote
Old 26th November 2012, 11:59 AM   #5633
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by robbbby View Post
Right now I do not have earth/ground connected to the case, should I ground the case to earth?
As in house/mains earth? No, I wouldn't, but I would make sure the case is connected to pin1 of your XLR connector (and pin 4 / ground on the nCore input plug - the shield on the input cable).
  Reply With Quote
Old 26th November 2012, 12:07 PM   #5634
jtwrace is offline jtwrace  United States
diyAudio Member
 
jtwrace's Avatar
 
Join Date: Jan 2007
Location: NC
Mine are dead quiet too as they should be.
__________________
"Science is not a democracy"- Earl Geddes, Ph.D.
  Reply With Quote
Old 26th November 2012, 12:20 PM   #5635
ua100k is offline ua100k  United States
diyAudio Member
 
ua100k's Avatar
 
Join Date: Dec 2009
Location: Bernardsville, NJ
Default Noise

Quote:
Originally Posted by robbbby View Post
Hey guys, trying to do some troubleshooting and had a question for those of you that own ncores. When powering cycling the amps without anything connected to the amp other then the speakers are you guys experiencing any light popping at power up and power down?
When the amp is powered up, speakers connected but no input, are you guys getting static/white noise when you put your ear near the tweeter?

I'm just trying to figure a few things out and some are saying they get dead silence at the tweeter with the amp on and no source and some are saying the static/white noise is normal. Just wanted to see what others with ncores are experiencing.

Thanks
You are getting the noise from the amp and/or power supply.
Check in this order.
1. Audio input wires are shielded and away from other noise sources on the boards.
2. Move your boards away from the inputs. You might have just the right amount of interaction. You can try shielding with foil.
3. Play with your grounding. You may have your circuits acting like a radio receiver. Try grounding the input XLR audio ground/Chassis pins. Try grounding the chassis to power supply ground, and so on.
__________________
Audio Purity
  Reply With Quote
Old 26th November 2012, 01:06 PM   #5636
diyAudio Member
 
Join Date: Mar 2004
Location: At the output stage
Send a message via Yahoo to mr_push_pull
this is interesting. my UCDs only output the slightest amount of noise that can only be heard ear against tweeter at max volume. and I'm not even sure its amp noise, it may be because of front end (DS1666 volume control). output wires running relatively close to input ones, not balanced, not shielded, not twisted. true, speakers are only 83 dB W/m.
__________________
we all love a good ol' stereotype until it's against us
  Reply With Quote
Old 26th November 2012, 01:44 PM   #5637
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by jtwrace View Post
Mine are dead quiet too as they should be.
Indeed - with a specified 124 dB SNR, pretty much any noise is an indication of some sort of abnormal issue.
  Reply With Quote
Old 26th November 2012, 02:38 PM   #5638
ChrisPa is offline ChrisPa  United Kingdom
diyAudio Member
 
Join Date: Jan 2005
Location: Saddleworth
Robbby - testing with a shorted input seems like the starting point. They should be silent both in terms of pops and background noise.

There is a gentle click from the modules when they power up - not through the speakers
  Reply With Quote
Old 26th November 2012, 03:53 PM   #5639
robbbby is offline robbbby  Canada
diyAudio Member
 
Join Date: Feb 2012
Thanks for the replies guys.

I have adjusted the dc offset at both the input and output using r95 and r136. What does the third pot on the far side of the board do?

I guess I will also have to check all my grounding and wiring. I will take a picture when I get home from work and hopefully somebody more knowledgeable may be able to spot something troublesome.

ChrisPs - Can you explain the testing with a shorted input? I'm not sure I understand. Thanks.
  Reply With Quote
Old 26th November 2012, 04:00 PM   #5640
ChrisPa is offline ChrisPa  United Kingdom
diyAudio Member
 
Join Date: Jan 2005
Location: Saddleworth
short the input to the power amp
turn the power amp on

there should be no pops through the speaker
THe general consensus is also that there should be no audible hiss too

If there's a pop - then it implies there's something awry with the amplifier
A click form the module itself (not through the speaker) is to be expected

If there's hiss then it also impies there's something awry

If the pops and hiss reappear when you connect your upstream equipment, then it implies they're being caused/generated by the upstream equipment
  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 08:42 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