Class H amplifier idea - Page 2 - 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 14th December 2010, 06:40 AM   #11
diyAudio Member
 
Robert GS's Avatar
 
Join Date: Sep 2005
Location: Helsingor
Quote:
Originally Posted by qsa View Post
Test Class D amps in premium PA, no way the sound is hard and not amazing

you will replace with class AB / H amps

with low output power "Hi-FI" Class D sound good with "Hi-FI" speakers but high output power.... only bass
I don't agree either - but I like Lab.Gruppen Class TD for high power. You can track thier working Class TD amps back to 1990, so not a new concept
  Reply With Quote
Old 15th December 2010, 04:41 PM   #12
diyAudio Member
 
Join Date: Feb 2005
Location: Antwerp
And +1 for disagree. No Class AB amp I have ever owned/have my hands on comes close to what I can achieve with Hypex UCD.
  Reply With Quote
Old 15th December 2010, 04:59 PM   #13
diyAudio Member
 
lorylaci's Avatar
 
Join Date: Aug 2008
Location: Dabas, Hungary
Send a message via MSN to lorylaci
Anybody could say it's opinion, but that's not proof of anything.
The facts are:
- Class D amps are made with as low THD, as high Damping Factor, as high frequency coverage (put here any measureable paramter) as a Class AB / H amps. Just look at some professional designs So even a listener with a highly sophisticated ear cannot tell the difference, from an AB or a D calss amp, if their parameters are the same, if he does a BLIND TEST. (or double-blinded test the better...) Of course a not-blinded test can have any result, even depending of the weater or the phase of the moon.
- Class D amps have superior efficiency over Class AB / H amps. So any best-designed Class AB amp cannot have the efficiency of a Class-D amp.

Class H amps can be made without switching power knowledge. So this would predict they are easier to design. Apart from this you can see more simple Class-D designs than Class H designs in this forum.

If somebody likes amps with low Damping Factor (i really don't, thats not what i would consider as HiFi), just put a big power resistor series with the load. Low DF viola.
  Reply With Quote
Old 15th December 2010, 06:26 PM   #14
diyAudio Member
 
Join Date: Nov 2005
>Class H amps can be made without switching power knowledge.

Sounds like a good way to ruin a class H amp.
  Reply With Quote
Old 15th December 2010, 06:33 PM   #15
diyAudio Member
 
Saturnus's Avatar
 
Join Date: Jun 2005
Location: Copenhagen, Denmark
Quote:
Originally Posted by Andrew Eckhardt View Post
>Class H amps can be made without switching power knowledge.

Sounds like a good way to ruin a class H amp.
Not to mention life threatening but there's always the Darwin Award to aim for.
  Reply With Quote
Old 15th December 2010, 07:23 PM   #16
luka is offline luka  Slovenia
diyAudio Member
 
luka's Avatar
 
Join Date: Sep 2005
Location: in Slovenia :)
Send a message via Skype™ to luka
Quote:
Originally Posted by lorylaci View Post
If somebody likes amps with low Damping Factor (i really don't, thats not what i would consider as HiFi), just put a big power resistor series with the load. Low DF viola.
I don't undrrstand why you would want to have less control over cone, maybe for speaker to "fluf" around uncontrolled... not really precise sound generator if you ask me
__________________
home page @ http://www.classdaudio.tk/ @ 24/7 all year long
I FEEL SLOVENIA
  Reply With Quote
Old 15th December 2010, 07:50 PM   #17
diyAudio Member
 
lorylaci's Avatar
 
Join Date: Aug 2008
Location: Dabas, Hungary
Send a message via MSN to lorylaci
Quote:
Originally Posted by luka View Post
I don't undrrstand why you would want to have less control over cone, maybe for speaker to "fluf" around uncontrolled... not really precise sound generator if you ask me
I like high Damping Factor, I consider HiFi sound must use high DF amps. But lots of people write pages about the godness of low DF, and the "lifeness" of resonant basses.
i just showed if you have a high DF amp, you can turn it whenever you want to a low DF one...
  Reply With Quote
Old 15th December 2010, 08:18 PM   #18
diyAudio Member
 
Join Date: Nov 2005
The situation pertaining to the argument though is that whether linear or switching modern semiconductor designs yield damping factors that are so high as to be negligible when considering speaker driver response.
  Reply With Quote
Old 15th December 2010, 08:22 PM   #19
diyAudio Member
 
Robert GS's Avatar
 
Join Date: Sep 2005
Location: Helsingor
Ohh you smart guys - when will class D be cold power when it's off !
Small case stereo UCD400 project - heat issue
Efficiency is high at high volumes - at low volumes NO - how loud do you play when it's HiFi?

High damping factor from a class D amp to what use?
Let us see your loudspeakers (Yves Smolders, luka, lorylaci)! - please!!! links/pictures...!
  Reply With Quote
Old 15th December 2010, 08:37 PM   #20
diyAudio Member
 
Saturnus's Avatar
 
Join Date: Jun 2005
Location: Copenhagen, Denmark
Quote:
Originally Posted by Robert GS View Post
Ohh you smart guys - when will class D be cold power when it's off !
You're confusing two things I think. Power supply efficiency and amp efficiency.

In class G (or H) that's the same thing but in a class D amp the power supply is seperate. In both efficiency should theoretically scale according to output level but some SMPS's lose efficiency faster than they theoretically should so that at very low volume levels a class G (or H) amp is more efficient. Also because in class D amps there are 2 seperate units that each draws idle current.

If you use a trafo (which have a pretty much constant 98% efficiency) or battery supplies for the class D amp it will always be more efficient.
  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
New idea for low dissipation Class A amplifier. Mooly Solid State 69 1st December 2009 10:11 PM
Got 2x65VAC PS, any idea on Class-D amplifier module? barco Class D 0 16th October 2008 02:21 PM
Just an idea: Tubes and Class D NeoY2k Class D 5 6th September 2008 07:43 PM
Pure Class A Single End Amplifier Idea! Dxvideo Solid State 91 1st September 2008 10:54 AM
Another Class A headamp idea Dxvideo Solid State 3 19th November 2007 08:08 AM


New To Site? Need Help?

All times are GMT. The time now is 07:44 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