check your head, this is what audiophile amps do - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 July 2012, 06:41 AM   #1
xmaxxx is offline xmaxxx  United States
diyAudio Member
 
Join Date: Jul 2012
Default check your head, this is what audiophile amps do

Crown reference, why did they stop making you?
Attached Images
File Type: jpeg 66CMRFIG08.jpeg (35.6 KB, 218 views)
  Reply With Quote
Old 13th July 2012, 09:07 AM   #2
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
Not really. You want lower distortion at lower power where it matters. You aren't going to notice the difference between 0.1% and 0.001% at 1kW.
  Reply With Quote
Old 13th July 2012, 09:10 AM   #3
diyAudio Member
 
StigErik's Avatar
 
Join Date: Feb 2008
Quote:
Originally Posted by theAnonymous1 View Post
Not really. You want lower distortion at lower power where it matters. You aren't going to notice the difference between 0.1% and 0.001% at 1kW.
The crown has it. The only reason THD+N is rising at lower powers is that the noise floor is constant, meaning there is no distorstion, only noise to be measured.
__________________
dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles
  Reply With Quote
Old 13th July 2012, 09:25 AM   #4
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
Quote:
Originally Posted by StigErik View Post
The crown has it. The only reason THD+N is rising at lower powers is that the noise floor is constant, meaning there is no distorstion, only noise to be measured.
That's even worse, no?
  Reply With Quote
Old 13th July 2012, 09:30 AM   #5
diyAudio Member
 
StigErik's Avatar
 
Join Date: Feb 2008
No it itsn't. The noise floor of the Crown is very low, so low you cant hear the background noise through your speakers. And the distortion is even lower than that. I think thats pretty good.
__________________
dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles
  Reply With Quote
Old 13th July 2012, 09:40 AM   #6
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
If the distortion at 0.1w is negligible, the noise floor is ~35dB down.

So if your speakers do 90dB @1w, with ~0.1w input, that's 80dB. So 45dB of noise?
Pretty much falls into the noise floor of a typical room.
  Reply With Quote
Old 13th July 2012, 09:45 AM   #7
diyAudio Member
 
StigErik's Avatar
 
Join Date: Feb 2008
The numbers are voltage related, so noise at 0,1W is -70 dB.
__________________
dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles
  Reply With Quote
Old 13th July 2012, 02:08 PM   #8
xmaxxx is offline xmaxxx  United States
diyAudio Member
 
Join Date: Jul 2012
No I am having fun messing with these inexpensive class-D or T amps,
I keep reading "audiophile" quality with the distortion figures, I thought
it is a little silly, but still not fair to test them against $5k amps! what
are people finding with The L25D boards? they seem like a bargin!
Oh and the crown is very quite, even with enough gain to produce
a 800 watt 50hz sine wave the rest of the spectrum is around
-100db!
Attached Images
File Type: jpeg 66CMRFIG05.jpeg (24.6 KB, 131 views)
  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
Best Car Audio Audiophile Head Unit You Have Used And Tried Celestra-rules Car Audio 62 10th June 2014 10:41 PM
Audiophile parts for chip amps chris_cosgrave Swap Meet 0 29th March 2010 05:34 PM
High quality audiophile op-amps RichLund Swap Meet 2 27th February 2010 09:24 PM
No love for Tripath amps in the audiophile community Doglover Class D 3 13th June 2009 05:58 AM
Head amp pcb. Please check for errors wxn Solid State 8 11th June 2006 12:56 AM


New To Site? Need Help?

All times are GMT. The time now is 04:44 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