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DUAL Merus MA12070 fully balanced Amplifier pictures inside

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#122
daniboun said:
The Murata PQC250-24 is also a choice to consider...
I know that Orchard Audio use them into their BOSC Gan amps. Orchard Audio confirmed their superb performance
But I did not check their size )
Click to expand...

Thanks. The Murata is 5"x3"x1.4" , but the Mornsun is 5”×3”×1”. Very close, but I'm afraid it's too much risk if the screw holes do not align perfectly. The Murata also is a multi-output-PSU as it seems, whereas the Mornsun is a single-out.

What I like about the RPS-400 series, besides them having great actual measures in about everything (measures, not claims!) the 5V standby-out is measured with 28mv Ripple@full load/1A. Since my DAC is using about 0,5A only, the true Ripple should be 10-20mv which is superb and only beatable by linear powering, which doesn't make sense here, because the DAC is suited for SMPS use.

Report/measures: RPS-400-MEAN WELL Switching Power Supply Manufacturer
 
#127
To be sure, I shorted the terminal & output HP cable block, by soldering directly my HP cables on the bottom of the PCB...

So :
Quite balanced. Homogeneous, detailed.
But:
Lacks energy, depth, and bass definition.
Lacks body and density.
The sounds and textures should be more differentiated; general Polyester cap (MKS) coloration.
Lack of vigor, rhythm, full-bodiedness, glitter..., thus lacks emotion.
I am not impressed.
Is it the Chip, a coupling capacitor ?.

Despite its limits (noise, kinda simplification), i prefer my super tweaked FDA (STA326).
Still a believer in FDA (open loop), dreaming of an improved STA326.
 
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#134
douede said:
To be sure, I shorted the terminal & output HP cable block, by soldering directly my HP cables on the bottom of the PCB...

So :
Quite balanced. Homogeneous, detailed.
But:
Lacks energy, depth, and bass definition.
Lacks body and density.
The sounds and textures should be more differentiated; general Polyester cap (MKS) coloration.
Lack of vigor, rhythm, full-bodiedness, glitter..., thus lacks emotion.
I am not impressed.
Is it the Chip, a coupling capacitor ?.

Despite its limits (noise, kinda simplification), i prefer my super tweaked FDA (STA326).
Still a believer in FDA (open loop), dreaming of an improved STA326.
Click to expand...

This shows how subjective sound evaluation actually is as I do not hear any of this - even though bass control at demanding speakers (low sensitivity) is better handled by a much more powerful TPA chip....
 
#135
In my listening tests the Sabaj got other people pleasantly surprised. This on various loudspeakers. It simply is very good value for the money. If it would have existed let's say 15 years ago I would have saved quite some money 🙂 For more or less objective judgment and "middling out" one should have a few people, a few sets of speakers and a few other amplifiers all in the same environment at the same time.

One personal situation with 1 other amplifier on the same set of speakers may indicate ... a bad marriage between the Sabaj and those speakers. Just as an example.

We tried the Sabaj with a tube hybrid pre that we know to be very good. It made the results worse with the Sabaj... Best results were with sources connected directly to the Sabaj (via RCA, there was no symmetric stuff available). Why or how I don't know and I don't care. Such things happen.
 
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#137
jean-paul said:
In my listening tests the Sabaj got other people pleasantly surprised. This on various loudspeakers. It simply is very good value for the money. If it would have existed let's say 15 years ago I would have saved quite some money 🙂 For more or less objective judgment and "middling out" one should have a few people, a few sets of speakers and a few other amplifiers all in the same environment at the same time.

One personal situation with 1 other amplifier on the same set of speakers may indicate ... a bad marriage between the Sabaj and those speakers. Just as an example.

We tried the Sabaj with a tube hybrid pre that we know to be very good. It made the results worse with the Sabaj... Best results were with sources connected directly to the Sabaj (via RCA, there was no symmetric stuff available). Why or how I don't know and I don't care. Such things happen.
Click to expand...

Since you sold the Sabaj. What is your actual setup ?
From what I understand, you would rather let yourself be seduced by an FDA? I listened to the QULOOS QA690, that is one the best FDA as far as I remember.... I know it is using a Meanwell PSU and some good quality components around the TAS5624.

QULOOS QA690 FDA Power Amplifier 24bit 192khz 2x100W / 8 Ohm - Audiophonics

For my part, I was not impressed by the Quloos, I found it a notch below the Sabaj ... I imagine, however, that everything depends on the overall setup. BTW is has been reviewed here : Quloos QA690 : Test amplificateur numerique

Did you try the D2160MKII with the TAS5548 chip ? Would be curious to get opinions )
 
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#138
FWIW: I am very satisfied with a Denon PMA60 for some time now. Since it has all the inputs I could wish for it is more user friendly. Till now the best value for money in the FDA field too. Since audio is a religion and many "believe" all sorts of stuff I take the liberty to believe FDA to be the future (supported by market movement) and only put time in digital devices and FDA. I think the Denon also uses Infineon ICs but I never cared to open it (a first!) as it is simply very good. Its predecessor PMA50 was extensively modded by me just like Nuforce DDA100, FX Audio D802, Wadia 151, various STA326 based devices etc.

The longer I am busy with audio the more I think a combination of factors is what counts. Example: I have various streamers here that all sound very good but the one that I like most is the Elac DS-S101-G. It does not sound the best, it handles the best. A device that has the best combination of factors but does not sound the absolute best can therefor be preferred. I also take price into account, no absurdly expensive stuff is considered as price does not say much in 2021 (please try out NAD M10 🙂). For me personally it is about best price/quality ratio combined with acceptable size and not too much focus on topology but it should be energy efficient. So my opinion is to be taken with a grain of salt, as usual.

I admit I did not compare with the Sabaj directly... as eh... I feared it could be beat 😀 This time I did not want to know.
 
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#140
Ah Ok, I haven't bothered to find out as it is good as it is. So product X comes in, take it out of the box and connect it. Give it some time and listen. That approach as other methods feed prejudice and bias.

I paid 425 for the Denon so I consider that the "A20a of FDA" 🙂 I read the single real complaint by a few here about the noise at the -10 dB volume setting of the Sabaj. Well, like many analog amplifiers it indeed was noisy but not to be taken into account seriously as that level of volume is absurd. Still ... an FDA like the Denon is then 100% silent.
 
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