Bryston needs a clue - 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 3rd August 2006, 08:14 AM   #1
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
Default Bryston needs a clue

Hi,

For anyone who remembers Bryston's newsletter commented on here not all that long ago, "Dan Agnanos Speaks Up On Amplifier Design" Volume 9 issue 1.... which I and I believe others interpreted as being heavily skewed and/or highly misinformed regarding class d amplifiers.. I thought it would be amusing to post this gem which I just tripped over.

I'm more amused that it occured long before the above article was discovered and reprinted by them, namely Volume 7, Issue 4.

http://www.bryston.ca/newsletters/74_files/vol7is4.html

It starts off with Bryston commentary:

"About Digital (Class D) Amps
About once a week I get a question regarding Digital Amplifiers and where Bryston is going with this technology.
The following article was written recently by Bruno Putzeys - Chief Engineer at Phillips Class D Audio Systems Laboratory. PLEASE read it - it is VERY GOOD. It explains where digital technology is and what the future holds for this technology"

Followed with a short article by Bruno, and finishes up with pure ignorance from Bryston along the lines of :

"So you can see that the so called superiority of Class D amplifier technology has been greatly exaggerated. Good old well designed ‘linear’ analogue amplifiers (of which Bryston represents the best available) are here to stay. Class D amplifiers with their open loop digital pulse width generator exhibit all the attendant disadvantages of Class D designs namely, poor frequency response linearity, high noise and sensitivity to power supply ripple.

Class D designs certainly have a place in sound reinforcement, 70 volt applications, mass produced mid-fi products like receivers and subwoofers where low cost, low weight and high efficiency is required but if State of The Art sound is what your after - not so fast! At Bryston we are constantly looking and searching for better ways to build audio amplifiers and we have and will continue to evaluate and test these Class D designs (or any other technology that comes along for that matter). Distinctive from Class D amplifiers, all Bryston SST Series amplifiers have low noise, low output impedance and vanishingly low THD that is constant with frequency. Bryston will continue to research in the direction that gives our customers the most accurate audio amplifier performance available. "

I find it hard to believe they're stupid enough to not know that the analog class d amplifier from the very guy they thought wrote such a fine article doesn't at all fit the description which they chose to depict, and continue on to say how they test everything they can find to bring their customers the best etc. This is obviously a deliberate effort to deceive... much like their 20 year warranty does the same.

What a shame they don't believe in their product enough to be able to stand behind it without having to put down competing technologies in such a deceptive fashion.
  Reply With Quote
Old 3rd August 2006, 08:44 AM   #2
diyAudio Member
 
Join Date: May 2002
Location: Switzerland

  Reply With Quote
Old 3rd August 2006, 08:46 AM   #3
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
Quote:
Class D designs certainly have a place in sound reinforcement,
Bryston will have its place in history .....

Regards

Charles



Remark: don't ask me how I managed to post like that .........
  Reply With Quote
Old 3rd August 2006, 08:47 AM   #4
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
Yeah, I think they see it comming too.
  Reply With Quote
Old 3rd August 2006, 09:14 AM   #5
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
What, just like the people that still make a good living out of valve amps?
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 3rd August 2006, 09:16 AM   #6
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
yeah, and BJT's too.

I'd agree there's a market for them, but I don't think they're doing themselves any favors twisting things in order to make themselves appear more favorable. Poor tactic... no class..... no class at all.
  Reply With Quote
Old 3rd August 2006, 09:19 AM   #7
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
It's just marketing. And as we all know, that might as well come from a different planet. As an interested observer, I think all manufacturers and evangelists for different technologies are equally as guilty.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 3rd August 2006, 09:22 AM   #8
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
That's true. I guess I'm disappointed that I fell into their marketing trap in the past.. thinking they were worth a damn
  Reply With Quote
Old 3rd August 2006, 09:27 AM   #9
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
I think the difference between manufacturers of valave amps and Bryston is that the former already know that they belong to a niche market.
Do not missunderstand me: This is not a bad thing at all but the Bryston article and the way they missuse a cited article clearly shows some arrogance.

Regards

Charles
  Reply With Quote
Old 3rd August 2006, 09:30 AM   #10
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
Well said. In the least it's a serious lack of professional integrity. If they were the company they pretend to be that should never be allowed to happen. If that were my company I'd be truly ashamed of that. I didn't even see them having the guts to sign a name to that.

  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
Mystery amplifier ... no clue? lineup Solid State 4 6th September 2008 09:45 AM
experienced in car audio, no clue for an HT sub n2audio Subwoofers 4 14th January 2008 02:44 AM
Any clue of how to use this part as a current sink for a CF? G Tubes / Valves 36 19th July 2006 07:35 AM
THRESHOLD unknown model ??? Clue please anyone? Thurax Pass Labs 5 4th November 2004 03:42 PM
trasformer help (I have no clue) JZatopa Chip Amps 20 13th February 2004 10:29 PM


New To Site? Need Help?

All times are GMT. The time now is 04:08 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