New Linear Power supply upgrade for DMP A-6

Once I was like you, guys, Archmago, Amir and so on. But things changed with time and practice)

 

That was not Amir. Was a tech guy from RME...

 

See interview with this RME guy I posted above, it's not that simple.

Not all LPSU sounds better with RME, for example Topping p50 was less pleasant than SMPS.

As I mentioned above - it's not about breaking SQ limits, just coloration or spice as you wish.

 

Coloration spice is not what better SQ is about. You can get it with EQ, if you like, but again: it has nothing to do with SQ. Let alone "better".
We are talking about changes (well, TBH, enhancements) in SQ.
A well engineered DAC is not affected at all by its PS.
1. The analog and digital domains do not mix. Especially when noise floor is the culprit.
2. Noise floor is already far beyond human perception.

 

RME is affected by PSU - bad dac?

If you associate SQ with graphics and numbers it's your choice. I only rank my gear in way of getting pleasure to ears, it's a hobby)

 

A few things here:

• Electronic systems should be able to be characterised by their measurements, so when talking about SQ in terms of high fidelity reproduction on the source, using (the right) graphs and numbers should do this.
• I don't think that anyone is suggesting that you can't or shouldn't change the sound of your system to suit your tastes, just like seasoning your food. People understandable get funny about this being characterised as 'better' SQ, rather than just 'different' or 'personal taste' though.
• If the measurements say that changing the PSU in not audible, it seems unlikely it will make any difference. It doesn't matter how much you 'trust' your ears, the measurements will be more accurate and more repeatable.

 

Always the same subjective nonsense, no technical knowledge and comparisons made without any basic controls.

Keith

 

Ok, even when difference is validated in DBT, but there is no one in performed measurements - than you are going crazy, money wasted and so on)

There is no science at all, but clearely that something is missed or not measured properly)

DIXI

 

Always the same discussions that get nowhere, with the subjectivists staying on their positions and the objectivists wanting to impose their views.

This is not constructive and add nothing to the purpose of this forum. You act like the smartest guy but i see you don’t understand the most basic logic. And this is not ASR, so people are free to discuss about anything, even snake oil….my god, go out, get a life

 

Plenty of circle jerk subjective forums for you Jammy.
Comparisons without basic controls are completely worthless, cognitive bias ( for obvious reasons) is never discussed by manufacturers or retailers.
Yet it is hugely powerful

 

Kei-Kei, i see you still don’t get it, do you? Either there is language barrier here or you are a complete moron

 

Wrong or Right just let the people do and decide what they want you are not being asked to be a judge and don’t be a smart ass

 

Not sure who you’re referring to, can you please clarify?

 

Keith from Purity Audio shud listen to people that want to have their own opinion period!

sorry if I wasn’t clear JamOne it wasn’t meant for you

 

I recently tested an expensive power amplifier and could hear a buzz on both channels. The amplifier is a Class A/B audio amplifier and has a "linear" PSU with a 500VA toroidal transformer. So, thinking it might have a fault in the PSU I decided to take a look at the output of the amplifier with my oscilloscope to "see" what the nature of the noise was. I have added a screenshot of that waveform of what I observed. The waveform shows a square wave of 50Hz which is "riding" a sinewave of 2.6Hz in frequency. Now the d.c. output of full wave rectified power supply operating on a 50Hz mains supply should have a ripple frequency of 100Hz and would normally be sawtooth in nature if there was any ripple to measure, but this amplifier was producing a buzz of 50Hz with no input connected.

I eventually was able to identify the source of the 50Hz squarewave. It was coming from a power monitor connected on the same mains circuit. Furthermore the 2.6Hz interference which was intermittent in nature was coming from a HVAC system every time the compressor was in operation. I think this just proves that "linear" PSUs are not automatically the best performers when it comes to noise present on the mains supply. I will hasten to add that no other amplifiers have exhibited the same behaviour on the same circuit, so the only logical deduction is the amplifier in question has a poor power supply rejection ratio. On unplugging the power monitor and switching off the HVAC system the noise disappeared.

I think that many audiophiles make the mistake of automatically assuming all "linear" PSUs are superior to their switch-mode counterparts. Whilst this might be true in some cases, it certainly isn't in all.

 

It is not. According to one of their developers/builders.
You should consider double blind tests, level matched to 0.1dB (at least), as louder is perceived as "better" by our brains.
Then we can talk again. PS do (or do not) the following:
Provide power (5V, or 3.3V DC)
Provide current (depending on the demand, but a DAC has no current demand, as it is no power AMP, and in rare cases, an active pre-amp)
Provide (but better not...) ground noise, in the form, generally, of 60Hz (50 in the EU) and the relative harmonics (which, depending on their level - in dB - may, or may not - affect your listening experience)
Many, if not all, the nowadays modern, very-low-noise SMPS DO HAVE such ground noise. Yes, they do. But it is very close to -140dB, which in turn is almost 25dB lower than the almost established minimal threshold of human hearing (yes, I know, Mr. Watts claims to hear differences at -300dB, but that's not my case - luckily - and most probably neither yours...)
So, the factors that can tell you a linear PS sounds better are either wrong listening comparison methods, or expectation BIAS.

Of course you can argue you do hear a difference; but do not forget your ears (and your brain) play funny tricks, especially when the visual sense, and knowledge of change, are involved.

Consider the following as a tell-tale:

But in the end, as you say, it's a hobby. And if you are fine with spending money on something that does make you hear, and feel, better, then do it. I just wouldn't.

 

Posted this before but nevertheless an interesting read.
The key point is that if the unit is competently designed ( which will be evident in its measurements) then a separate power supply cannot make an improvement.
https://www.audiosciencereview.com/...o-you-need-linear-power-supply-for-dacs.7021/

Keith

 

So, as I promised - LPSU vs. stock.

DMP A6 is used as transport for RME adi 2 and Apogee DA1000, but even this way improvement is great. More natural, more transparent sound, less ringing.

Everyone with ears should try it, Keith and other deaf scientists - don't waste your time shitposting)

 

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Keith

 

What does any of that even mean?