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Old 17th October 2012, 11:44 AM   #51
atoluma is offline atoluma  France
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thank you, it is just what I wanted.

I will let the frame in place, I am building a taller case.
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Old 29th October 2012, 09:28 AM   #52
atoluma is offline atoluma  France
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Any news of the datasheet Roberto?
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Old 29th October 2012, 10:25 AM   #53
AP2 is offline AP2  Italy
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Quote:
Originally Posted by atoluma View Post
Any news of the datasheet Roberto?
Hi,
Just today i finish last measures also in smps section of DPA-400-xx,
then, some special measure (not standard), i show in this thread.
I think AP send you in 2 days.
NOTE:
becouse we started with F1, this have height >40mm, (heatsink use with 40mm), now F3 assemble new heatsink 36mm height. (your products have already this new) then, total height is 36mm+2mm base panel.
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I think that today, the best choice for a fan is to have an integrated amplifier, especially if it has been developed with the care necessary to achieve the performances, as a audiophile expect.
Given that a separate psu, is not a simple choice, judging by the noise problems that some diy complain. (with competitors smps..eheh)
To this is added, the result obtained without a fast voltage regulation.
Many diy, do not seem to understand, tons of work, research and development also of custom transformer, to obtain a total absence of noise, RFI included. but this is life!

Regards

Last edited by AP2; 29th October 2012 at 10:30 AM.
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Old 29th October 2012, 10:34 AM   #54
atoluma is offline atoluma  France
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Quote:
Originally Posted by AP2 View Post
I think that today, the best choice for a fan is to have an integrated amplifier, especially if it has been developed with the care necessary to achieve the performances, as a audiophile expect.
This is exactly what I found appealing with your amp. Nowaday, I think PSU must be part of amp. There is so much interactions between psu and amp...
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Old 29th October 2012, 11:01 AM   #55
AP2 is offline AP2  Italy
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Yes, I totally agree.
Much of my time was spent on the comparison result in high Fidelity room. (this is my feedback with the development), my goal was when some audiophili mature, tried this amp (without knowing that it was a class D). compared with 30Kg class AB, all connected to professional loudspeaker with very low load.

Is easy to understand the limitations of an amp's with jazz and symphonic orchestra. if you set the volume at 70% power.
many class D amp's, already falls on the female voice and cimbals.
With the symphony, is immediately out the deficiency of the psu or turn down the volume ... hehe.
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Old 16th November 2012, 01:34 PM   #56
AP2 is offline AP2  Italy
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Hi,
Sorry for "OT"
Official release of DPA-400/F-3 (AP have not update photos)

Atoluma: this is your version.

PS. Coming soon measure (standard/ extended), some according thread title.
thank at all for patience

Regards
Roberto
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File Type: png DPA-400-F3-Official release.png (954.2 KB, 246 views)
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Old 16th December 2012, 09:32 PM   #57
AP2 is offline AP2  Italy
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Hi, for now just a fft at 3w and 60w (4R).
DPA-400/F-3 connected direct on analyzer without filter.
Please, watch the segment 100Hz to 1kHz too.
without this cleaning harmonics, I can not put a smps in a good amplifier.
combined with the fast response, this amplifier is able to offer new performances, immediately listenable than another amplifier with smps, or linear power supply.
We have no doubt that this is a new real direction, instead of ultra low thd.
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The audio system of perception (ears + brain) is very sensitive to the geometry of the sound. because we use it to recognize sounds.
If I add a lot of treble on the sound of the snare drum, I am not able to disguise, everyone recognizes the snare.
same if I add 1% thd. but if haughty the geometry of only 0.4%, we perceive immediately that the musical instrument is changed. the geometry of the envelope sound defines the dynamic structure and consequently, the harmonic content.
Everything is so clear and perfectly repeatable in the lab, I do not understand why so many still insist with the linear power supply without fast regulation.
The circuits that stabilize the working point (in AB class) or a pseudo PSRR in D class, are not designed to respond to changes in the transients, are designed for DC or vs. the temperature.

The smps integrated in this amplifier is unique in the world a this moment.
like it or not, this is a truth!

regards
Attached Images
File Type: png DPA-400-F3-3w-4R.png (16.3 KB, 181 views)
File Type: png DPA-400-F3-60w-4R.png (17.8 KB, 176 views)
File Type: png Instrument-Zero.png (11.9 KB, 170 views)
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Old 29th January 2013, 07:00 PM   #58
atoluma is offline atoluma  France
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Any news of the datasheet Roberto?
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Old 31st January 2013, 02:40 PM   #59
atoluma is offline atoluma  France
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No answers here, no answers to email. Does anybody out there at Audiopower?
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Old 10th February 2013, 08:53 AM   #60
AP2 is offline AP2  Italy
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Hi all.
Full activity is restored by the end of February. I refer to the new office, websites and all shipments suspended.
Unfortunately there have been some coincidences as the radical change of AudioPower (location and type of product).

Email are connected only for AudioPower (info,sales,support).
The Technical Support group works.

Best Regards
Roberto
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