amplifier class - diyAudio
Go Back   Home > Forums > Loudspeakers > Planars & Exotics

Planars & Exotics ESL's, planars, and alternative technologies

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 25th September 2007, 10:09 PM   #1
diyAudio Member
 
willyhoho's Avatar
 
Join Date: Nov 2005
Default amplifier class

I am looking for a amp to drive my esl. I am confused when looking in this forum as to the class designation the amp should have. Can someone please clarify this? Do tube amps have different classes too?
Thanks
  Reply With Quote
Old 26th September 2007, 12:36 PM   #2
diyAudio Member
 
Join Date: Aug 2007
I am just a beginner on this forum, but it is my impression that Class-D amplifiers are best suited to ESLs.

For example the Hypex (http://www.hypex.nl) modules use a 90V supply voltage, which means that in most cases a 1:50 audio transformer should be sufficient.
Also the output of a Class-D amplifier (see here: http://sound.westhost.com/articles/pwm.htm) needs a capacitor. So the ESL will be just an capacitor parallel to the internal capacitor of the amplifier.
  Reply With Quote
Old 27th September 2007, 03:21 PM   #3
diyAudio Member
 
Join Date: May 2006
Location: Netherlands
Yes, tube amps have different classes too. Google a bit and you will find enough info about different classes and what it means.

I'm having good success with a push-pull class A tube amplifier and ESLs.
  Reply With Quote
Old 28th September 2007, 06:32 PM   #4
diyAudio Member
 
willyhoho's Avatar
 
Join Date: Nov 2005
I did not realize there was so many classes of amplifiers.I did some surfing and found more info (some confusing) on amps and I thought a amp was a amp. Thanks for the replys. Some say you can't go wrong with a class AB. I will do more research.
  Reply With Quote
Old 28th September 2007, 06:42 PM   #5
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
when Quad brought out their SS amp specifically designed to power their ELS they used ClassAB.

All their subsequent SS designs suit the ELS and ESL and still they are ClassAB, but with a funny feedback system called current dumping.
That must say something.
__________________
regards Andrew T.
  Reply With Quote
Old 28th September 2007, 10:44 PM   #6
diyAudio Member
 
Join Date: May 2006
Location: Netherlands
I had the best results with tubes in push-pull running deep into class A.
I'm running my Quad ESLs with this http://www.nutshellhifi.com/triode1.html DIY PP 300B amp and I can say that it sounds much better than the Quad 303 or 405. No doubt about it.
  Reply With Quote
Old 29th September 2007, 10:04 PM   #7
diyAudio Member
 
willyhoho's Avatar
 
Join Date: Nov 2005
I heard a AMC tube amp today and I think it was a Class A.What a clear,distinct sound. If the amp has no Class designation on the back,is there another way of telling?Age maybe?
  Reply With Quote
Old 30th September 2007, 09:09 AM   #8
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
Solid state ClassA get so hot you can tell it's not normal bias ClassAB.
There are a few high bias ClassAB around but these usually have heatsinks that get warm to hot due to their smaller size.
Tube/valve amps are difficult to tell apart.
But our tube experts could probably tell from the valve type and B+ voltage.
__________________
regards Andrew T.
  Reply With Quote
Old 6th October 2007, 03:48 PM   #9
Few is offline Few  United States
diyAudio Member
 
Join Date: Apr 2004
Location: Maine, USA
I too am looking for an amp for ESL's. My venerable B&K ST-140 amp, which I was using to drive my ESL's, died last week---at the same time that my DEQ2496 decided it was no longer interested in turning on. I haven't yet figured out what happened in this chain of events, but I find I'm in the market for another amp to drive my ESL panels. I'd rather stick to solid state and not spend a fortune. Have any class D modules been shown to be particularly cost effective and suitable for ESL service? Or as a more conventional (and less diy) alternative has anyone tried either the Behringer EP1500 or A500
amp? I've read some positive things about them, and the price is certainly right. I understand they can handle a low impedance load, but I haven't seen anything about their ability to drive a highly reactive load. Also, I have a feeling the Behringer DEQ2496 brought about the demise of my old amp so I'm a bit wary of Behringer at the moment.
  Reply With Quote
Old 9th October 2007, 06:15 PM   #10
Calvin is offline Calvin  Germany
diyAudio Member
 
Calvin's Avatar
 
Join Date: Nov 2004
Location: close to Basel
Hi,

I can wholeheartedly recommend the HiFi-Akademie amps.

They are a stereo class-d pre-filter-feedback concept for DIY. So freq-response depends on the speakers impedance, but filter components can be easily tuned to suit Your demands.
Capacity (as ESL-manufacturer) recommends and uses them with his panels and they have proved to work exceptionally stable with my panels, which are a real proof with low impedance values and phase angles reaching more than 80!!! B&Os Ice-Power-modules are for example not specified for the capacitive loads that typical ESLs represent and would start swinging with my panels (or ML-Panels)
I like that the H-As are built with a very straightforward simple signal-path and allow for higher currents than most other designs in their wattage-class. Price is similar to UCDs with Power-supply and You can purchase nice housings too.
Up till now their sonic performance in my setup was just topped by the enigmatic KR-Audio Kronzilla...at slightly elevated costs of course Price/Performance-value is very good.
As an interesing feature it is equipped with a slot where You can put optional crossover modules in (analog as well as digital). So You can easily create a fully active 2way ESL-version.

jauu
Calvin
  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
Class D Vs Class I (Balanced Current Amplifier) rmsaudio Class D 29 26th January 2014 10:25 PM
Class A Amplifier Jean-Paul_2 Solid State 22 21st June 2009 02:36 PM
Questions about how to decrease the PASS A-40 amplifier into a class AB amplifier. novtango Pass Labs 2 21st October 2002 01:50 AM


New To Site? Need Help?

All times are GMT. The time now is 12:30 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