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RME DPS-2 Linear Power Supply

Sokel

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@Sokel: I recommend reading Karl Raimund Popper's thoughts about empirical falsification.
Good article but data is nicer:

D50 III vs RME

D50 III EQ Match to RME.pngD50 III MT32 EQ RME_DAC.pngD50 III MT32 EQ Topping.png

Also:

Topping D50 III RCA Stereo DAC PEQ On Filters On Measurements.png

also:

also:


And some informed insight:
That correlated noise with the low frequency EQ engaged looks like a potential issue with filter quantization, either in coefficients or internal state. It is low level with the 1kHz tone, but you might want to measure with tones that are closer to that filter if you see it in the future.
At this low level, probably not a huge issue, but that noise, if the hypothesis of cause is correct, be careful about using very low frequency filters. This problem get worse as you move lower in frequency. For example, probably don’t want to put a 20Hz high pass filter on there.

Edit:links.
 
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staticV3

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AdamG

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Merged here. Thank you @staticV3 for your help with trying to keep the house clean and tidy. :cool:
 
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Sorry to chime in an old discussion.
I'm not an expert in power supplies, but I'm curious: from the description of this DCS-2, they claim it has two different plugs, one "linear" and a second with a special "mu-filter".
But I'm not sure I understand what's the difference (or what _should be_ the difference). WHy or how would you choose one or the other?

Can somebody help or point me to an explanation?
Thanks
MH
 

Aquascop

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Depending on internal resistance of the battery - any dynamic load (varying current) will result in a varying voltage on the output of the battery.
The impact off a battery (based on 18650 Li-ion units) on the ADI-2 DAC FS is VERY impressive (and is suggested in the manual). Even in a permanent charging mode, thanks the the BMS, the battery power supply is very clean and stable. and this is a 100e investment, far from the crazy price i see above on this new RME-dps
 

sonitus mirus

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The impact off a battery (based on 18650 Li-ion units) on the ADI-2 DAC FS is VERY impressive (and is suggested in the manual). Even in a permanent charging mode, thanks the the BMS, the battery power supply is very clean and stable. and this is a 100e investment, far from the crazy price i see above on this new RME-dps

A battery does not seem to be suggested for audio improvements, just for mobile operation and ground isolation. In fact, in the manual for my ADI-2/4 Pro SE specifically states that the choice of power supply is not critical.


<Page 12 excerpt>
6. Power Supply

In order to make operating the ADI-2/4 Pro SE as flexible as possible, the unit has a universal DC input socket, accepting voltages from 9.5 Volts up to 15 Volts. An internal switching regulator of the latest technology with high efficiency (> 90%) prevents internal hum noise by operating above audible frequencies. Internally the switching regulator is followed by standard linear regulators, followed by super low-noise linear regulators. Therefore the ADI-2/4 Pro SE achieves its technical specs even with less optimal power supplies. Or in other words: the choice of power supply is not critical.

Still the unit includes a high-quality switching power supply, 12 V / 3,3 A, which not only accepts any mains voltage between 100 V and 240 V (usable world-wide), but is also fully regulated against voltage fluctuations and suppresses line noise. Additionally it only weights 150 g in spite of its high power of 40 Watts.

The DC input of the ADI-2/4 Pro SE also allows for the use of a rechargeable lead-battery or LiPo instead of a power supply, for completely independent mobile operation and ground isolation. A matching connection cable (power jack 5.5 x 2.1 mm to terminals 6.3 mm) should be available from various sources. Special power banks in the range of 10,000 mAh and up can be found equipped with a 12 V output. These offer a perfect solution for mobility as well as ground isolated operation, for small money.
 

Purité Audio

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Unless it’s made by RME!
Keith
 

Aquascop

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A battery does not seem to be suggested for audio improvements, just for mobile operation and ground isolation.

yes you're right, they did not say it would drastically impact the sound quality. However, my only advice is : try, and you will be very surprised. The impact is so obvious that it would be a shame not to do it !
 

MAB

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yes you're right, they did not say it would drastically impact the sound quality. However, my only advice is : try, and you will be very surprised. The impact is so obvious that it would be a shame not to do it !
In fact, they said use of a sub-optimal power supply won't reduce the performance.
And, the performance is much better than human ear can hear.
Which is the same as saying power supply won't change audible performance at all.
Unless you have a honking ground issue.

Yet, you claim the difference is 'so obvious'. I think you would revise this if you were able to listen to different power supplies without knowing which one was being used.
 

antcollinet

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yes you're right, they did not say it would drastically impact the sound quality. However, my only advice is : try, and you will be very surprised. The impact is so obvious that it would be a shame not to do it !
Seems pretty unlikely - have you controlled for cognitive bias?
 

Reddoc

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yes you're right, they did not say it would drastically impact the sound quality. However, my only advice is : try, and you will be very surprised. The impact is so obvious that it would be a shame not to do it !
What battery setup do you use? Sounds very interesting
 

restorer-john

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Aquascop

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Seems pretty unlikely - have you controlled for cognitive bias?

I have a large experience in A/B and blind testing, with more than 30 years of step by step upgrades on my system. And what is really surprising here, is that when i say obvious ... it is obvious. no need to spend hours comparing. I was also quite astonished, and i shared my experiment on a french HiFi forum : I even sent my battery to one of the most skeptical expert of the group ... and 24h later, he proposed me to keep my battery and bought me a new one on amazon ...
 
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