Bash - 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 9th October 2004, 04:37 AM   #1
adan888 is offline adan888  Ireland
diyAudio Member
 
Join Date: Oct 2004
Default Bash

hello everyone, can someone tell me the merits of BASH technology compared to class AB amp?
Thanks
  Reply With Quote
Old 9th October 2004, 09:26 AM   #2
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
Hi,

http://www.bashaudio.com/technologies.htm

First time I heard of it, thanks for bringing it around.

From the little I can tell it's a class AB output stage with class D modulation of the power rails in order to help out efficiency...

Pro:
Extra efficiency Over a class AB due to the power rail modulation


That's all I can tell with the given info.

I'd imagine it would still have all the disadvantages of class AB, less efficient and less linear than a pure class D..

I smell fish when I notice all they speak of is power output /efficiency, for which it couldn't possibly match a pure class d topology (which I'm glad is a point they don't try to hide) and at the same time not a single graph regarding linearity, THD.. or even a claim as to what it could possibly be, anywhere.

In conclusion, I think they likely have an amp that's more efficient than class AB, less efficient than class d, and has the worst of both worlds mixed in.

Incedently, unless I'm mistaken, this seems to be an example of class G topology, which I don't see them state anywhere at all.
  Reply With Quote
Old 11th October 2004, 07:01 AM   #3
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
Quote:
Incedently, unless I'm mistaken, this seems to be an example of class G topology, which I don't see them state anywhere at all.
This is not a bad description. They actually use a class-d downconverter to feed the amp, like Carver does. The main difference is that BASH uses a bridge topology and Carver's is single ended.

There is also a more modern incarnation of this topology around:

http://www.audiophysic.de/produkte/mono/aufbau_e.html

And it seems to be based in this patent:

http://l2.espacenet.com/espacenet/vi...h&LG=de&DB=EPD

It had a lot of good reviwes, even Jonathan Carr was raving about it.

Regards

Charles
  Reply With Quote
Old 11th October 2004, 08:23 PM   #4
adan888 is offline adan888  Ireland
diyAudio Member
 
Join Date: Oct 2004
Question Bash vs Hypex

Hello,
Thanks Classd4sure and Phase_Accurate.
I'm planning to build my own subwoofer using either the SVS Bash(320w) plate amp or the Hypex HS500 and Eminence Lab12.Can you please tell me which amp is the best?
Thanks in advance.

adan888
  Reply With Quote
Old 7th November 2004, 09:25 PM   #5
alvaius is offline alvaius  Canada
diyAudio Member
 
Join Date: Feb 2002
Location: Toronto
The other thing about BASH is that it is commercially very successful. It is found powering a lot of active subwoofers in mid-end audio, as well as private labelled car amplifiers.

There is also potentially some linearity gains by having voltage rails track the audio signal that could offset other issues.

BASH doesn't pretend to be really high end, but deliver a commercially viable good quality product.
  Reply With Quote
Old 11th November 2004, 12:37 PM   #6
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
The original Carver cube (M400) was a tracking downconverter design, but Bob had troubles with production units so he went to the multi-rail design instead.

His Amazing subwoofer is a singlesupply, line operated, tracking downconverter design feeding a class AB amplifier rated at 2.7KW
  Reply With Quote
Old 11th November 2004, 05:48 PM   #7
sphinx is offline sphinx  Canada
diyAudio Member
 
Join Date: Nov 2004
Location: Toronto, Ontario
BASH is great technology however the benefits, compared to Class D, are almost wasted in a low frequency limited bandwidth application. The "bad" characteristics (such as interaction of the output filter with the driver) of Class D design don't really apply to a subwoofer. I'd use an amp with the highest efficiency possible (Class D)...it will be less expensive and provide you with more power.


BASH is actually an implementation of a Class H amplifier. Class G refers to multi-step rail voltages whereas Class H is defined as an amp with rail voltages that is modulated by the input signal.

That Carver sub is rated at 2.7KW peak dynamic power. That's 1350 Watts RMS dynamic and likely around 1000W RMS continuous but not FTC...still impressive though.
__________________
too many projects...not enough time
  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
Bash or not to Bash? peanut123 Subwoofers 4 25th August 2008 10:56 PM
FS: Dayton / BASH 500 Sub dsrviola Swap Meet 0 18th April 2008 07:20 AM
BASH subwoofer amp at PE Godzilla Subwoofers 6 13th June 2007 02:05 PM
BASH Plate Amp CARTRulz Subwoofers 6 29th June 2006 05:43 AM
Another Mac vrs windows bash jleaman The Lounge 74 8th July 2004 04:11 PM


New To Site? Need Help?

All times are GMT. The time now is 09:33 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