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Old 16th May 2010, 08:20 AM   #1
AP2 is offline AP2  Italy
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Default New DXA-400 class D Amplifier-Info

Hello everyone,
After speaking of this new amplifier on various threads, I decided
put some more info. (I hope you do not mind)

your comments are welcome.

Regards
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Old 16th May 2010, 08:34 AM   #2
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Hi,
sorry, thd Vs. frequency 30w(4R)

Regards
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Old 16th May 2010, 09:23 AM   #3
AP2 is offline AP2  Italy
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Hi,
Amplifier....


Regards
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Old 16th May 2010, 04:34 PM   #4
TCx is offline TCx  Czech Republic
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Hi AP2,
thank you for posting the information... I want to build a class D hifi amp for my home listening and am looking for class D amp modules providing best possible sound quality while output power is not so important. I looked at the DXA-400 module, as well as some other modules (DPA-600, MXD-500, etc.) at www.audiopower.it and they all seem to have impressive specs but I do not know which one would be best suitable for my purpose (best sound quality - maybe not best measurements but most enjoyable listening - although I know it may be quite subjective)...
Please advice which of them would be best for me. And suitable PSU, please.

Thank you
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Old 16th May 2010, 05:18 PM   #5
AP2 is offline AP2  Italy
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Hi,
To TCX
yes I'm agree with you, certain measures can direct the choice, but then ensure that the amplifier has a great sound.
I can tell you that in these new amplifiers was cured audio timbre. (Eg frequency response contains fitting works) are not visible from the curve.
flat response is only good for demonstrating the qualities of the amplifier, after this, Is Necessary fitting works as commercial esoteric amp,(flat 10Hz to..) is not good for the home audiophile listening.
The central work of AudioPower is not private (certainly important) But companies that need high quality, innovation at competitive prices.
I put these few steps to the right information, it is now possible to replace the heavy toroid with advanced technology and performance far superior to the traditional toroidal PSU (see thd vs. Freq.) Flat segment on 20-100Hz. this is not possible with other current SMPS. then this is information. (Or revolution)
you can turn to support-audiopower, I'm sure that will advise you well, you can say that speakers have to match the amp.
all amplifiers have true high-resolution on high-audio band and innovative circuit of protection.
Regards

Last edited by AP2; 16th May 2010 at 05:27 PM.
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Old 16th May 2010, 05:42 PM   #6
TCx is offline TCx  Czech Republic
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Hi AP2,
thank you for your response.
Does it mean that 2 DXA-400 modules and 1 DPS-500 PSU would best match my need? Or is there any superior combination? My speakers are 8 ohm floorstanders and I do not want much volume but high sound quality, as I wrote above.
BTW, does DPS-500 provide all necessary voltages for 2 DXA-400 modules?

Or do you think that I would get better results if I combined DPS-500 with some decent class AB amp module?

Thanks

Last edited by TCx; 16th May 2010 at 05:47 PM.
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Old 16th May 2010, 05:54 PM   #7
AP2 is offline AP2  Italy
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Quote:
Originally Posted by TCx View Post
Hi AP2,
thank you for your response.
Does it mean that 2 DXA-400 modules and 1 DPS-500 PSU would best match my need? Or is there any superior combination? My speakers are 8 ohm floorstanders and I do not want much volume but high sound quality, as I wrote above.
BTW, does DPS-500 provide all necessary voltages for 2 DXA-400 modules?

Thanks
Hi tcx,
Technically a DPS-500-1.3 is perfect for two DXA-400 at 8R.
yes, I also listen to low power but hit the bass drum feel dry and crisp.
This is without doubt a pleasant emotion.
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Old 16th May 2010, 05:58 PM   #8
Baldin is offline Baldin  Denmark
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Hi AP2
Is this your design?
Looks real good.

What are the 1 ohm resistor fuses for .... the +-15V PSU? (if these are 0,25W resistors, it will give 0,5A .. makes good sense ... thay looks a bit larger than 0805)

BR Baldin
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Old 16th May 2010, 06:08 PM   #9
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Quote:
Originally Posted by Baldin View Post
Hi AP2
Is this your design?
Looks real good.

What are the 1 ohm resistor fuses for .... the +-15V PSU? (if these are 0,25W resistors, it will give 0,5A .. makes good sense ... thay looks a bit larger than 0805)

BR Baldin
Hi,
Thanks for appreciation, the result is not only my work.
yes 1R intends to FUSE for 15V AUX_OUT. (Becouse dxa-400 contains the regulators on board)
For precision is 1206, is only precautional for aux-Vout
eheh no nothing escapes

Last edited by AP2; 16th May 2010 at 06:19 PM.
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Old 16th May 2010, 06:39 PM   #10
Baldin is offline Baldin  Denmark
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Why did you opt for an output relay?
It should be possible to make a noise free turn-on/off (not that I have succeded yet ), so it should only be for the further protection if everything fails .... but then again, a lot of newer large prof. amps lieves without it ......
Are you using micro processor for protection circuit?
BR Baldin
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