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
Closed Thread
 
Thread Tools Search this Thread
Old 9th December 2004, 11:19 PM   #21
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
Quote:
Originally posted by km
hi.

classd4sure/chris, i do have something to say here but im afraid you just missed the point.

i do know these amps quite well as i was involved in developing them (if you bother to look at our website you should be able to see some similarities...)

"Also, would I be correct in saying you hold no interest in small quantity sales?" - no you would not be correct

sorry if i repeat myself but a quick glance at the website would tell you and might give you a bit of info too......

about the amps in question , what do you want to know about them?

rgds - karsten madsen - www.cadaudio.dk
Hi,

What point did I miss? I'm able to read between lines but I'm afraid there was only the one.

You're correct, I do see similarities, too many in fact, we'll be wanting to know how they differ from yours, if at all? I do realize we'll have to wait for them to release more information before we can know the answer to that, but we'll require more information from you as well.

I now see you take your feedback post filter, this wasn't known to me before so that's one question down.

What type of modulation do you use? What sets your modules apart from the competitions, technically.

In the past people have asked you for graphs, yes, I know, graphs = not a listening test, but there seems to be agreement here proper graphs can give us an idea on how it might perform, and since this is a web based forum, I'm sure you understand, we don't have the luxury of a listening test, but we can read graphs.

You've also stated you supply such information to the OEMs, for which, at the time, seemed was your only interest in dealings. Since that has obviously changed, perhaps you'd privy us to that same information?

Furthermore, you can't just keep refering questions regarding your products to your website, people have obviously read it. It isn't so informative, but it does do its job of leaving us with more questions

I'll give you an example of what I mean:

Advantages and features of CAD Audio Class-d/pwm amplifiers:

...
* feedback after output filter (vastly improvement of audio quality)
...

While in the same section just a few lines down:

T0103S & T0104S modules are internally sync'ed togethe for the 2 channels , they are designed for and based on Tripath driver chips.

One issue here if those are Tripath based I'd consider putting them in a different section than your own designs.

That aside, since when does Tripath take feedback post filter?

You see the problem? It would be better if each of your own modules had its own section of features, type of modulation/feedback, graphs, etc. Then we wouldn't be asking any questions as there'd be non left, other than maybe "what are the best types of caps for my new..."

We can dig up all kinds of information on your competition, they've been very forthright and accommodating, I believe this has served them very well, and could for you as well.

You've been holding out, as it stands they're kind of the mystery amp behind door number 3. Please provide us with enough information, clearly layed out, so that we're able to make an educated decision about them.

Thanks for your reply and best regards,
chris
 
Old 10th December 2004, 04:09 PM   #22
Banned
 
Join Date: Feb 2002
Location: As far from the NOSsers as possible
Default You didn't miss the point.........

He only has two..............

One is to direct us to his site.............

When he isn't doing that, he tells us how much better his **** is than everyone else's ****. Sans details. He doesn't have that point yet.

I have heard enough of the first 2 that I am not interested in waiting on #3.

Jocko
 
Old 13th December 2004, 03:51 PM   #23
km is offline km
diyAudio Member
 
Join Date: May 2001
Location: dk
hi.

classd4sure you do have a point in making separate info sheets and webpages for the different modules we have , and yes you are right there are technical differences between the boards and modules we sell, meaning ours are different from the icepower modules, from the intersil modules and from the tripath boards.

i believe we have the broadest selection of pwm/class-d/digital power amplifiers in the business , but we will update the page frequently and will add more info in this process.

kuribo, several of the questions you ask are answered on the website that why i wondered if you had been there, a bit of news for you however is that we are thinking about selling switch mode supplies separately from our amps as we have had very many requests for these, another reason is we have invested in our own smd line which should give us an edge regarding time and pricing.

the reason why i cant tell you many details abut the coldamp boards is because i got an email requesting not to do so.

but as you have seen they are very close to a couple of our boards and i can give you details about these if you want it (you can ask here on in email as you prefer, i dont come here every day as some may have noticed....)

jocko homo , thanks for pointing out again that ignoring you is probably the best answer to you....

rgds - karsten madsen - www.cadaudio.dk
 
Old 13th December 2004, 04:23 PM   #24
Sheriff is offline Sheriff  United Kingdom
diyAudio Member
 
Sheriff's Avatar
 
Join Date: Feb 2003
Location: England
Send a message via Skype™ to Sheriff
Default KM

KM,

Good to have you back - i had just about run out of 'smoke and mirrors.........' could do with a bit of re-stocking.

Sheriff
 
Old 13th December 2004, 06:42 PM   #25
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
Hi KM,

I'm glad you appreciated my simple observation, here's a few more:

You still seem unwilling to answer any questions regarding your amp modules, now is the time to start divulging the goods, or save face and fade away. It's of no use to anyone to keep saying "if you have any questions just ask" when nothing gets answered. You seem to be taking everyone here for complete fools.

I agree that you do have an extremely broad selection of amp modules, some, if I'm not mistaken, are straight off a data sheet. This tells me a few things about your modules, and coupled with your unwillingness to divulge any noteworthy information on them, just doesn't say much of anything good for them.

Hmmmm, what could you be hiding?? Your modules are either reaaaally bad and so you've so little faith in them that you're having to resort to selling everyone elses brand, including those amps straight off a reference design on a manufacturers data sheet, or it's decent to good but violates too many patents to shake a stick at.

That's some strong speculation is it not? Much like good story telling, when you give too little detail, you leave the people to create their own. Is that really how you want to market your products?

I think I've more than made my point. I doubt I'll be seeing any serious responses to any questions.

Speaking of points, I have to disagree with you Jocko, he seems to have three.

 
Old 13th December 2004, 06:47 PM   #26
Jennice is offline Jennice  Denmark
diyAudio Member
 
Join Date: Jun 2003
Location: Planet Earth
Quote:
Originally posted by km
....i believe we have the broadest selection of pwm/class-d/digital power amplifiers in the business , but we will update the page frequently and will add more info in this process.
...

rgds - karsten madsen - www.cadaudio.dk
...

There goes his commercial gene again...

I've had enough of this guy. Too bad that an interesting thread lost it's read-worthyness. I'm outta' here.
__________________
I get paid to break stuff. My g/f gets paid to play with children. Life is good.
 
Old 13th December 2004, 08:10 PM   #27
km is offline km
diyAudio Member
 
Join Date: May 2001
Location: dk
hi.

classd4sure, could you send me a list of questions and i shall do my best to answer them.

if doing so please specify what boards or group of boards you are referring to, ok?

rgds - karsten madsen - cadaudio.dk

ps. my doubt goes more like if i will be seing any serious questions

ps. bye jennice, having read the postings from jocko homo and sheriff i certainly follow you , btw. have i ever seen any usable input from you??
 
Old 13th December 2004, 08:35 PM   #28
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
Hi,

Questions? Believe it or not, you've answered them all!

Just give me a few hundred of whatever you feel like,
here's my credit card #: 5309 6806 8560 1278
10/09

If you have any questions regarding my order, just give me a call.

Regards
Chris
 
Old 13th December 2004, 08:51 PM   #29
km is offline km
diyAudio Member
 
Join Date: May 2001
Location: dk
hi.

classd4sure , thats cool , when i get back to you and ask you to be a bit more specific thats your reply, well.....

rgds - karsten madsen - cadaudio.dk
 
Old 13th December 2004, 09:26 PM   #30
km is offline km
diyAudio Member
 
Join Date: May 2001
Location: dk
hi.

classd4sure , you didnt have many specific questions after all , did you?

you said earlier that some of our modules " if I'm not mistaken, are straight off a data sheet."

i believe you talk about the tripath boards and you are right to some degree, basically as i think you know all control and drive functions are integrated into the driver chip so most amps based on these chips will be "off the data sheet" , there are some tweaks possible in the feedback path and in the output filter and we have made some of these, also external components have an influence on the sound quality, i would think you know this.

you have made your point about having more specs and graphs on-line, i cant really say much else than "point taken , it will come...."

rgds - karsten madsen - cadaudio.dk
 

Closed Thread


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
WTB: UCD400 or 180 modules. OR, some SKA Modules Spiritzly Swap Meet 0 27th September 2008 07:08 AM
UcD modules - can the modules work without the input op-amp? beppe61 Class D 8 11th October 2006 07:35 AM
Hi Guys! I'm one of the Portuguese Guys who love diy sapito Introductions 3 2nd September 2002 02:19 PM


New To Site? Need Help?

All times are GMT. The time now is 03:54 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