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SDA-400 Professional multi-way
SDA-400 Professional multi-way
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Old 10th February 2014, 05:47 PM   #471
AP2 is offline AP2  Italy
Join Date: Dec 2009
Location: Italy
Hi fabrice,the DPS-400 seem very small in photo..uh! is very large your Heatsink?
I not have listen impression from Others DPS->VSSA, so... I'm very curious..
You have dedicate two DPS-400,one for each Amp..I'm wrong? or you have 4CH?
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Old 10th February 2014, 06:14 PM   #472
pinnocchio is offline pinnocchio  Canada
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Join Date: Sep 2010
Location: Montreal
The VSSA do heat up so for two modules the heatsink seems pretty good.

PREAMPs : Bal AMB α10 + JC-80 | Bal DCB1 | Bal LDR3x | AMPs: AMB β24 | ExtremA | FO v1.4 | USSA5 | TSSA | Telos 390 Clone | NX Amp | FC-100
DACs : TPA Buffalo II + OPC's NTD1 I/V | JLsounds | Mirand AK4490 + Discrete Output Speakers : Troels Gravesen ATS-4 | Sagwee LT V3
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Old 10th February 2014, 07:03 PM   #473
maxidcx is offline maxidcx  France
diyAudio Member
Join Date: Jan 2012
SDA-400 Professional multi-way
you are right, on this heatsink (comming from one channel of a vintage accuphase 303X) which is temporary, the heatsink comes to 41°C without load/signal.

so yes it seems the vssa gets hot

I hope to do som listening tomorow morning. This took a lot of time to prepare this equipement, and to calibrate it ...

Yes Roberto you are right I have 4 DPS and then I m planing to have 2 DPS for each channel (Left / Right). one DPS is for the 2 woofers (8') and the second DPS is for the Compression and the tweeter. This should be ok .
But for the time being, I m just "testing" all of that in basic stereo mode with a single DPS . That is not optimal, but still it delivers a stuning result.

stay tuned
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Old 11th February 2014, 07:46 AM   #474
maxidcx is offline maxidcx  France
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Join Date: Jan 2012
SDA-400 Professional multi-way
Hello Folks;

this is a nice shining day here on the east side of the atlantics
this is the DPS+VSSA "in situ" this morning
Click the image to open in full size.

The first very good news , is that I cannot here any sort of noise in the tweet and comp. the DPS is clean and the PSSR of the VSSA is good. no need for additional coil or whatso ever fancy caps. no zzzz or chhh or fffff

this is the first 30' of sound so this is not possible to give any judgment of any kind, either for the combi VSSA-DPS or for any comparaison between SDA and VSSA if anyone wanted that, sorry

let me say the music is just Good, so good. Well, very conventional I d say. soft, cool, nice, that doesnt rock as the first try with the DPS-SDA, something different, here. bass very good, but not as tight and powerfull as SDS (yet?).
Voice/mids less brillant, more soft but sill good details.

well. I must stop otherwise I would start judging things which cannot at this stage

for those questioning VSSA with DPS, I feel very very good with this combinaison (compared to my DIY trafo 1200VA classA/B ). Still the 1000uF onboarded on the VSSA PCB might have a serious impact on sound.

for those questioning SDA vs classA/B, waouh, I m very very satisfied as you understood.

all of that needs more analysis...(and time!)

but my project of integrating both SDA and VSSA driven by DPS in a single solution is confirmed today.

good luck for your integration and enjoy the sound
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Old 17th February 2014, 07:53 AM   #475
ghiglie is offline ghiglie  Italy
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Join Date: Mar 2013
Location: Ancona but roaming in Rome, Milan and Turin.
Originally Posted by AP2 View Post
Given the success that has seen the MDA-400 dual mono config.
I decided today to order 40pcs from our services. will be ready in 25-30 days.
Today we have only one kit as MDA-400 Dual-Mono version at + / -58V instead of 52V.
please, not bumbard me via pm or email.
likely also, custom case will be ready in the meantime.

Interesting! I'll wait for the custom case.
As far I understood (sorry, it's Monday and I'm totally numb, maybe you've already said it), it's a complete kit PSU+AMP stereo (or dual mono?) + case... ready for my noobish hands?

Last edited by ghiglie; 17th February 2014 at 08:13 AM. Reason: ehm... didn't understand if the kit proposed is DM or Stereo... :D
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Old 17th February 2014, 10:10 AM   #476
AP2 is offline AP2  Italy
Join Date: Dec 2009
Location: Italy
Hi Guys,
Good News.

MDA-400 arrive from our services (all smd parts assembled).
Some parts of the custom design case,as cover,rear panel arrived. (both version,Dual Mono Integrated as showed in photo,and for Dual Mono single case (168x60x240)mm.
This in photo, is Blue Cobalt opaque. available 6 colors pastel opaque.
Well, tomorrow arrive first qty of Nichicon audio grade caps (full set),then start assemble and final test.

Availability for this Kit = 40pz.
MDA-400 Integrated Dual Mono complete Kit.

Professional high quality, it's a delicius amp with Modern high style case, goes well with stylized décor of your home,instead of old iron case I think.
Well, 1 year for realizze this case, as some already know. but I'm tubborn.
You can see aspect of rear panel complete, in some photos in thread.
Then, this series MDA-400 at 58V with full Nichicon audio grade- deliver quiet 2x520w rms at 2R.
Behavior is typical of large Class AB, in warm sound and high current on the load (up to 22A repetible).
The case includes:
Top / bottom cover with logo in Perspex materials AudioPower
N-4 feet AL (made ​​on a lathe) + cathcu pins High grip
Rear panel complete with high-end components certified
N4 grills matt black (for the slots of the air flow)
Front panel, 10mm thick, rounded corners, with logo AudioPower.
N-2 side profiles AL & magnesium surface.
Reservation needed for this kit. The next amount we can get at May June. Considered amateurs waiting, mostly from Italy.
Also, I can not guarantee that the bid price, can be repeated.

Designed and made in Italy
The complete Kit,not require iron solder.

If interested, please create a list, I think we need 10 days.

Attached Images
File Type: jpg SDA-400-Dual Mono-Kit.jpg (73.7 KB, 160 views)
File Type: png SDA-400-Dual-Mono-Kit2.png (966.3 KB, 160 views)

Last edited by AP2; 17th February 2014 at 10:18 AM.
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Old 17th February 2014, 10:31 AM   #477
weskoki is offline weskoki  Europe
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Hi Roberto!
What is the price for two cases?

Also how much power does the mda-400 deliver on 8R?
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Old 17th February 2014, 10:40 AM   #478
AP2 is offline AP2  Italy
Join Date: Dec 2009
Location: Italy
Hello Fabrizio, sorry if I did not answer, but they are pretty darn busy.
Ah .. you're the perfect man for testing hard (long wires, without a metal base for the heart).
But this is good to test instability, and induced noise.
As you know, full-range, it is obvious that a smps DPS-400, for each amp, it is very much better.
well, it should come out, even some tests from Pinnocchio , Also interesting because made at 120Vac 60Hz.
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Old 17th February 2014, 11:51 AM   #479
AP2 is offline AP2  Italy
Join Date: Dec 2009
Location: Italy
Single Mono-Block case version.
Also, we present the new professional Guitar Amp 100w 8R. 20Hz to 22Khz, 0.03% THD @ 100w.
Compared in Studio Vs. the best in the world Guitar Amps.
Wait for A-600 complete Guitar Bass, powered by DPA-600/F.

Attached Images
File Type: jpg Mono-Block Case.jpg (206.0 KB, 120 views)

Last edited by AP2; 17th February 2014 at 12:01 PM.
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Old 17th February 2014, 12:11 PM   #480
giannettino is offline giannettino  Italy
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Join Date: Oct 2004
Location: Italy
SDA-400 Professional multi-way
Hi Roberto..
i'm in for a stereo casing...so the list.

1) Giannettino 1 stereo case
Sorry for my english...Be patient
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