Topic: RME LNI-2 DC vs DPS-2
Are the LNI-2 µFilter output voltage specifications the same as the DPS-2 µFilter output?
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RME LNI-2 DC vs DPS-2
RME User Forum → ADI-2 & 2/4 Pro series, ADI-2 DAC series → RME LNI-2 DC vs DPS-2
Posts: 11
1 2024-10-01 17:06:07 (edited by johny_2000 2024-10-01 17:07:07)
Re: RME LNI-2 DC vs DPS-2
DPS-2 
LNI-2
- MC
- Administrator
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Re: RME LNI-2 DC vs DPS-2
Basically yes, but the circuit is not 100% identical due to different power requirements, and the source before the µFilter differs as well. See the tech specs in the manuals....
Regards
Matthias Carstens
RME
Matthias Carstens
RME
4 2024-10-01 21:14:57 (edited by johny_2000 2024-10-01 21:16:39)
Re: RME LNI-2 DC vs DPS-2
MC wrote:
Basically yes, but the circuit is not 100% identical due to different power requirements, and the source before the µFilter differs as well. See the tech specs in the manuals....
Thanks Matthias. I understand the difference in supply sources. But I'm more concerned about the output characteristics when using them to power an ADI-2 unit. The load won't exceed 2A/24W if I'm right.
- MC
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Re: RME LNI-2 DC vs DPS-2
It's ok for DAC and Pro. The 2/4 can draw more than that (for example with low impedance phones balanced) so we don't recommend the LNI-2 DC for the 2/4 Pro SE.
Regards
Matthias Carstens
RME
Matthias Carstens
RME
Re: RME LNI-2 DC vs DPS-2
Re: RME LNI-2 DC vs DPS-2
MC wrote:
It's ok for DAC and Pro. The 2/4 can draw more than that (for example with low impedance phones balanced) so we don't recommend the LNI-2 DC for the 2/4 Pro SE.
Thanks. Got it. I'll never exceed that power consumption with the 2/4 Pro.
8 2024-10-06 02:42:06 (edited by johny_2000 2024-10-06 03:39:56)
Re: RME LNI-2 DC vs DPS-2
So here we go!
Test conditions:
DAC: RME ADI-2/4 Pro SE
Output: XLR
Level: +19.5 dBU
USB isolator: Intona High-Speed USB Isolator 7054-DK (1kV)
ADC: E1DA Cosmos ADCiso
APU17 Notch filter: E1DA Cosmos APU@1 kHz@0 dB preamp
Power sources: Original 3-prong grounded Power Supply, Lithium 18650x6 12.4V battery pack, RME LNI-2 DC.
The summary:
Original PS:
Noise=-124.5 dB SNR=121.9 dB THD+N=-119.5 dB
Lithium 12V battery pack:
Noise=-124.7 dB SNR=122.1 dB THD+N=-119.7 dB
RME LNI-2 DC:
Noise=-125.4 dB SNR=122.8 dB THD+N=-120.1 dB
Conclusions:
As RME stated, the ADI-2 unit is not sensitive to power supply. It has a marginal +/- 1 dB improvement in any output specifications with most complex power supplies, such as the original grounded power supply, lithium battery pack, RME LNI-2 DC module. This is a big compliment to RME's engineering team, who managed to maintain the specification with all USB sources and 12V power supplies.
Re: RME LNI-2 DC vs DPS-2
johny_2000 wrote:
So here we go!
Test conditions:
DAC: RME ADI-2/4 Pro SE
Output: XLR
Level: +19.5 dBU
USB isolator: Intona High-Speed USB Isolator 7054-DK (1kV)
ADC: E1DA Cosmos ADCiso
APU17 Notch filter: E1DA Cosmos APU@1 kHz@0 dB preamp
Power sources: Original 3-prong grounded Power Supply, Lithium 18650x6 12.4V battery pack, RME LNI-2 DC.
The summary:
Original PS:
Noise=-124.5 dB SNR=121.9 dB THD+N=-119.5 dBLithium 12V battery pack:
Noise=-124.7 dB SNR=122.1 dB THD+N=-119.7 dBRME LNI-2 DC:
Noise=-125.4 dB SNR=122.8 dB THD+N=-120.1 dBConclusions:
As RME stated, the ADI-2 unit is not sensitive to power supply. It has a marginal +/- 1 dB improvement in any output specifications with most complex power supplies, such as the original grounded power supply, lithium battery pack, RME LNI-2 DC module. This is a big compliment to RME's engineering team, who managed to maintain the specification with all USB sources and 12V power supplies.
Helpful results, thank you.
Re: RME LNI-2 DC vs DPS-2
AndyL wrote:
Helpful results, thank you.
Thank you!
A colleague suggested that I repeat these tests with unbalanced outputs and a 2-prong 12V power supply to better detect the differences. I think this makes sense, because balanced XLR outputs and interconnects are less susceptible to various noises and the influence of the ground loop. I need to think about this in future tests.
11 2024-10-06 11:24:57 (edited by KaiS 2024-10-06 11:27:23)
Re: RME LNI-2 DC vs DPS-2
johny_2000 wrote:
…A colleague suggested that I repeat these tests with unbalanced outputs and a 2-prong 12V power supply to better detect the differences. I think this makes sense, because balanced XLR outputs and interconnects are less susceptible to various noises and the influence of the ground loop. I need to think about this in future tests.
This would just test the situation of “ground loop”, the grounding configuration and cabling, and nothing that ADI-2 is responsible for.
Even little changes in cable orientation changes the ground loop related noises by magnitudes.
It would not say anything about ADI-2’s quality, and not much about the PSU’s.
I’ve had to fight with this when I built a distortion tester for condensers that can measure distortion products down to -155 dB or less.
I consider your original measurements well done and an important proof of a fact that already was supposed and expected:
ADI-2’s quality is PSU-independent, and can survive (cable-)transfer to another device.
What I really appreciate is, you are using a valid measurement rig and know how to use ist, thanx!
Posts: 11
RME User Forum → ADI-2 & 2/4 Pro series, ADI-2 DAC series → RME LNI-2 DC vs DPS-2
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