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Old 30th September 2013, 03:28 PM   #21
AP2 is offline AP2  Italy
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Hi all,
I agree witn Pinnocchio, exist a plastic ring D=22mm,various color that you can use also.
I'm sorry,we use this pcb for sub. just I want realizze this promotional test in a simple way.

I see you've changed, you now have a nice bottom .. plate.
can lift 2-4mm the amplifier with the spacers or bolt 3MA, when fixed to the base.
... you will create the ice with this heatsink!

Last edited by AP2; 30th September 2013 at 03:39 PM.
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Old 30th September 2013, 04:31 PM   #22
tinitus is offline tinitus  Europe
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ok, just for you

but doesn't matter, I have to redo it anyway
did not notice that middle pot is lower than middle of XLR (horisontal)

I will mount a jack plug in the place of output XLR
and one RCA next to it

I suppose they may all function as in and out(aux)
and I plan to have hi-z buffered instrument input on the front
for that I may need a switch
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Old 1st October 2013, 10:52 AM   #23
tinitus is offline tinitus  Europe
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sorted input board misallignment problem this way
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Old 1st October 2013, 11:01 AM   #24
AP2 is offline AP2  Italy
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Hi,
Good in the end to find a simple double panel.
that is intended to use this amp? just my curiosity.

yes, input signal is repeated at output, such as passing through to go to other active sub (in our case this input board).
--------------
in a few moments, I put aluminum parts and the rear panel stereo for two mda-400, as requested by some diy via pm.

regards
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Old 1st October 2013, 12:09 PM   #25
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I just finished the first series of tests, I hope to be able to write a bit tonight.
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Old 1st October 2013, 12:51 PM   #26
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by AP2 View Post
Hi,
Good in the end to find a simple double panel.
that is intended to use this amp?

just my curiosity.
back panel JACK or RCA input for use as power amp

front mounted jack with hi-z buffer for direct connect to instrument
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Old 1st October 2013, 01:02 PM   #27
AP2 is offline AP2  Italy
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Hi,
The rear panel includes a complete anodized frame, screws, etc. to be mounted in a few minutes. CNC machining.
the components on the rear panel, are exactly the ones in the picture.
all signals pass from the cable 10Pin (assembled), so it's plug & play.

Regards
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Old 1st October 2013, 01:15 PM   #28
AP2 is offline AP2  Italy
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Quote:
Originally Posted by tinitus View Post
back panel JACK or RCA input for use as power amp

front mounted jack with hi-z buffer for direct connect to instrument
Well, maybe you use unbalanced input I think.
remember to close one pin (-) input to AGND for this.
tell me your impressions with guitar bass,i know that "touch of chord" is very nice in this mda-400.

Last edited by AP2; 1st October 2013 at 01:18 PM.
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Old 1st October 2013, 08:38 PM   #29
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It is not easy to write a review as I thought... So I will try to make it short and clear and will try to answer all questions.

The MDA400 was compaired with:

1.The resident MUSE power 160
2.GM70 SET amp
3.Primare 30.2(used as integrated and as preamp).

Speakers that were used were:

1.The Magneplanar MG12
2.Zaphaudio ZD5
3.Dynaudio Contour 1.3 Special Edition and tadaaaaa
4.Swans speakers 2.3BF

The Muse is warmer sounding than the MDA400, it has silky smooth top end that reaches higher where the MDA400 is not as extended and a little less resolved. Midrange on the MDA400 is much clearer though, you can understand speach easier and the bass goes lower than the Muse.

The GM70 has a magnificent midrange that is better than the MDA400 by miles but it costs 5000euro just in parts and comapred favorably to amps for 30 000$ so the comparison was not fare at all. Still the MDA had the same tonal balance, just the GM70 is better in quantity, not quality and this is a great compliment!

The MDA400 is more energetic than the Primare, in fact the two sound quite close, the Primare is one of the amps that I have had that sound much more powerfult than it actually is and that is again a compliment for the MDA400 being almost the same. The Primare has wider soundstage, the MDA400 has more depth to the stage, you choose.

No matter what I thought I had heard about the measurements the MDA400 drives all speakers with ease up to levels I tolerate. The 2.3BF is one huge speaker, the MDA400 drive it quite well to high levels, I do not care if it measures well or not if it sounds OK and we had no problems with it. It has one other quality that is important to me - the chameleon like nature of a well balanced design - change the preamp and you have a compeletely new amp, it does respond well to changes in powercords as well.

I prefer the MDA400 on the Maggies and the Muse on the Zaph ZD5 and Dynaudio, I was expecting it to be the other way round but it was a suprise. The Maggies with the MDA400 sound more alive and involving, subjectively they go lower while with the Dynaudio the lower midrange is less pronounced and the sound is on the bright side and I prefer the warmer sound of the Exicon transistors in the Muse. My speakers of choice are the Maggies

All in all the MDA400 was quite a pleasant surprise, now I have my friends buying all kinds of modules in Class D so we can have a competiotion .

Congratulations to Roberto for the polished design,at last some good sound from Class D at a good price, had it not been those months of waiting I believe many people would be enjoying a great power amplifier now.

As soon as the financial situation permits I intend to buy the F1s and I will report on them too. If they improve on the MDA400 that might be the power amp future for me.
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Old 1st October 2013, 09:23 PM   #30
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Nice review Nikola.
Very good that you could use different speakers and other amplifiers,
that gives the review much more value.
I'm also interested in the DPA-400/F1 or F3.
Regards,
Danny
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