Class A and bass - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 1st January 2015, 07:30 PM   #1
diyAudio Member
 
Join Date: Dec 2014
Default Class A and bass

How does class A handle bass over AB? Mideast it create tight accurate bass like AB?
  Reply With Quote
Old 1st January 2015, 07:33 PM   #2
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
The class of operation has no bearing on the bass provided you are comparing two competent amplifier circuits.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 1st January 2015, 07:42 PM   #3
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
use bigger bike

Attached Images
File Type: jpg elephant-on-bike.jpg (67.1 KB, 793 views)
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 1st January 2015, 08:12 PM   #4
diyAudio Member
 
Join Date: Dec 2014
I just don't understand becaise 80hm will drop down the 4ohm doubling the required power. So class A is fine under heavy loads? I don't want to lose bass quality.
  Reply With Quote
Old 1st January 2015, 08:47 PM   #5
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
What it sounds like we need is somebody who has built a 100W F5T or Aleph and also built the Honey Badger.
They all are competent designs, maybe this will help put the subject to rest.
I know my 25W F4 wipes the floor with my commercial "High Current" Class H+, across all metrics except efficiency of course.
  Reply With Quote
Old 2nd January 2015, 08:08 AM   #6
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by Shockfett View Post
So class A is fine under heavy loads?
As long as it has been designed as such then yes, its fine. Just be realistic how big, hot, heavy and power hungry such an amp will be.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 3rd January 2015, 04:57 AM   #7
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
In my experience, push-pull Class A always walks away with the prize on
bottom end vs AB, but the current limitations of Single-Ended Class A
have been occasionally known to come up short in the "punch" department.

  Reply With Quote
Old 4th January 2015, 02:32 AM   #8
Dave2 is offline Dave2  United States
diyAudio Member
 
Join Date: Nov 2014
As far as sound quality in bass, I think the most important thing is low distortion and linear phase. And any well designed, direct coupled amp will good in both of these departments. In my experience, class A really shines over AB in the mid-upper registers. And the usually limited power of pure or single-ended class A(which I believe can have much better sound quality than a heavily biased push-pull design) means one would probably be better off going with the AB due to the greater punch available.
FYI, unless the woofer is passively crossed over, like in a multi-way system, the impedance is never going to drop below the DC resistance of the voice coil, which is typically about 5Ω for an 8Ω speaker.

Last edited by Dave2; 4th January 2015 at 02:36 AM.
  Reply With Quote
Old 4th January 2015, 03:34 AM   #9
BigE is offline BigE  Canada
diyAudio Member
 
Join Date: Aug 2008
Location: Toronto
When one speaks of "bass punch" what frequencies are we talking about here? As an active speaker user crossing over at 100 and 900 Hz, would I lose this bass punch with a SE design in the 100-900 range?
  Reply With Quote
Old 4th January 2015, 04:34 AM   #10
Dave2 is offline Dave2  United States
diyAudio Member
 
Join Date: Nov 2014
To me, and this is very arguable I think, anything up to 120Hz can contribute to bass punch. That being said, I have a 16wpc class-A crossed over at 100Hz and it does OK. But I have a small space as well. Efficiency of your speakers also plays heavily into it. I have ~90dB on my mids.
  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
Why do 12V Class-D-Amps have weak Bass Hansolol Class D 5 16th July 2014 11:01 PM
Class D kits for bass guitar amp?? chicago_mike Instruments and Amps 32 23rd February 2013 08:40 PM
Varying Bass With Different Class-A Amps shaan Solid State 30 14th December 2009 09:18 AM
Class-D lack of sustained bass Myth Zero Cool Class D 15 9th July 2009 06:41 AM
which class D amp to run bass driver 56oval Class D 16 4th September 2007 09:57 AM


New To Site? Need Help?

All times are GMT. The time now is 08:31 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2