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-   -   TDA8920 TDA8924 By Connexelectronic, Opinions Please. (http://www.diyaudio.com/forums/class-d/138290-tda8920-tda8924-connexelectronic-opinions-please.html)

cirrus18 10th February 2009 11:31 AM

TDA8920 TDA8924 By Connexelectronic, Opinions Please.
 
TDA8920 TDA8924 By Connexelectronic, Opinions Please.

I recently asked http://connexelectronic.com/ if their class-D amplifiers were of a standard to be called audiophile quality, I received this reply:

"cirrus,

to answer to your question, i will quote from the amplifier module datasheets few charcteristics:
" cirrus,

to answer to your question, i will quote from the amplifier module datasheets few charcteristics:
" TDA8920: Output Power: 2x70W at 4[, or 35W at 8[, with max. 0.1% THD+N, at +/- 27V Supply Voltage.
TDA8924: Output Power: 2x70W at 4[, or 35W at 8[, with max. 0.1% THD+N, at +/-27V Supply Voltage.
Output Power in Bridge mode: 160W at 4[, +/-24V or 135W at 8[, +/-27V Supply Voltage.
Audiophile sound Quality: 0.02% THD+N at 36W at 4[ or 20W at 8[.
Very good efficiency: Up to 90% at 2x35W at 8[ or up to 87% at 2x70W at 4[.
"
i consider them audiophile quality, and i also built my own system whic i use for listening with this amplifiers.: Output Power: 2x70W at 4[, or 35W at 8[, with max. 0.1% THD+N, at +/- 27V Supply Voltage.
TDA8924: Output Power: 2x70W at 4[, or 35W at 8[, with max. 0.1% THD+N, at +/-27V Supply Voltage.
Output Power in Bridge mode: 160W at 4[, +/-24V or 135W at 8[, +/-27V Supply Voltage.
Audiophile sound Quality: 0.02% THD+N at 36W at 4[ or 20W at 8[.
Very good efficiency: Up to 90% at 2x35W at 8[ or up to 87% at 2x70W at 4[.
i consider them audiophile quality, and i also built my own system whic i use for listening with this amplifiers."

From the above specs what would you think about them say, compared with the Hypex modules? I know they are of a lot less power but don't mind that if they sound excellent. They are also a lot less expensive which is really a very good point in their favour.

I wonder if anyone who has one of these amplifiers would please share their experiences and also let us know how they rate the sound quality.

Workhorse 10th February 2009 06:13 PM

So anything below 0.02% THD is audiophile quality, then why tube amps with 1% THD are also audiphile's choice.........
I think a T-amp will do good here also, after all what you need is to know how to wire a volume control to it and it works like anything and we have moderator's support for it also.

classdphile 10th February 2009 06:19 PM

Wow, do they know you go around pasting personal emails to public forums? That's totally uncool!

cirrus18 10th February 2009 09:17 PM

Quote:

Originally posted by classdphile
Wow, do they know you go around pasting personal emails to public forums? That's totally uncool!
Still going round making snide remarks I see. You add nothing to this forum so WIND-YOUR-NECK-IN, get your facts right before opening your mouth in the future, see here: http://www.diyaudio.com/forums/showt...60#post1740060

classdphile 10th February 2009 10:01 PM

Quote:

Originally posted by cirrus18


Still going round making snide remarks I see. You add nothing to this forum so WIND-YOUR-NECK-IN, get your facts right before opening your mouth in the future, see here: http://www.diyaudio.com/forums/showt...60#post1740060


My sincerest apologies, I hadn't realized it was just another case of cross posting and not citing the source you paste from.

http://www.diyaudio.com/forums/showt...68#post1739968

Cristi 11th February 2009 03:16 PM

chill-out folks, the answer to the questions can be in the datasheet: http://www.connexelectronic.com/docu...ier_Module.pdf

should i spam the board, like i saw in other places, saying that is the best module ever made, with 101% efficiency, cheapest possible or other subjective oppinions ?
i think the customers which purchased this before and use them can say their oppinions.

as Workhorse mentioned before, the "audiophile" term is absolutely relative, as some ppls preffer tubes, others Class A, other (including me) high efficiency of class D and T, without compromising the sound quality. it is not a Class D or T advertisment, since for now i sell at least as much Class AB amps as Class D and T together.

Bearman 11th February 2009 11:44 PM

I can safely say that CNX's TDA8920 amps sound very good. I have several of them. The NXP chips seem to have a much better bass, when the Tripath chips seem to lack a bit.

romtom 20th February 2009 07:22 PM

Hi,

First post in diyaudio, seems very very interesting to me what is discussed here !

I'm working on a self amplified speaker dedicated to bass frequencies, and the TDA8920 et TDA8924 seem to fit all my needs : enough power, very good efficiency, small size, bridgeable, and very well priced :)

As I don't know these chips at all (I'm more in Tripath at the moment), I still have a few questions :

- why should you prefer one chip or the other ? They seem to have the same specs, where is the difference ?

- I understand the heatsink has to be placed on the base of the IC. Would a flat metal piece be sufficient if large enough ? (I have casing issues ...)

- cnx, do you provide a facility to operate the mode ? I'm not very self-confident in electronic details, and I have difficulties understanding all the stuff provided in the user manual (would be better translated in French :D )

Thanks for you answers !

Cristi 23rd February 2009 10:10 AM

the main difference between this 2 IC is the output power, output load impedance and the sound quality. although in the datasheet is stated that they have same supply voltage and similar output power at low THD, TDA8924 can work with low impedances such as 2ohm and TDA8920 can work with at least 4ohm. the current limit also is 7.5-8A for 8920 and 11-12A for 8924. the sound quality is a little better for 8920 than 8924, esspecially if is 8920B.
for cooling, is enough to install on a flat surface, which can provide less than 5 deg/W thermal resistance. note that the thermal pad need to be insulated from the GND, as is connected to V-, not GND.

romtom 24th February 2009 11:37 PM

Thanks,

Seems that 8920B is the good choice for me then. I can't see it on your website though. Do you have some in stock ?


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