• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required as is 20 years of participation in forums (not all true). Come here to have fun, be ready to be teased and not take online life too seriously. We now measure and review equipment for free! Click here for details.

Measurements of RME ADI-2 DAC and Headphone Amp

MC_RME

Member
Technical Expert
Manufacturer
Joined
May 15, 2019
Messages
70
Likes
302
I would appreciate some help understanding parametric equalization. I have a specific exercise in mind for the RME. According to the manual, the NOS filter has essentially perfect impulse response at the expense of a slow roll off of the high frequencies beginning at 5kH and ending up down 3dB at 20kH. The graph for the rolloff of the filter is shown in the manual.

I would like to correct this rolloff so that a I get flat response to 20kH when I use the NOS filter. I have five bands to work with. But I don’t know how to overlap them in order to get the flattest response. My first attempt which sounds pretty good is just based on playing around. And looks like this:

Band 1: .5db, 7.5 kH
Band 2: 1.0db, 12.5 kH
Band 3: 1.5db, 15 kH
Band 4: 1.5db, 20 kH

All bands have a shelf filter and a Q = 1.

All I know is that the highs are no longer rolled off and it sounds pretty good. I don’t have a good sense of what Q is doing for me and how the overlapping bands sum.

Any help, in particular, what would be theoretically correct, to fix the rolloff of the filter would be both interesting and appreciated. I am curious how the NOS perfect impulse response will sound without the rolloff.
https://www.forum.rme-audio.de/viewtopic.php?id=26952
 
Joined
Apr 18, 2019
Messages
72
Likes
40
Thanks for having posted the correct eq settings for this situation. I just saw that post a few minutes ago and asked some questions there. I guess one question I have has to do with the statements about aliasing (a concept that I know very little about) and the audibility of those artifacts. Are they audible? Basically other than the hf roll off is their any reason not to use the NOS filter?
 
Joined
Jun 23, 2019
Messages
6
Likes
1
Hi! I have a very similar setup to yours. I have a KGsshv Carbon, SR007 mk2's as well. The RME sounds wonderful over electrostats!
Great setup. The only question in my mind is I listen to music on Tidal, most of the time at least. idsd micro black supports MQA and I can notice the difference master quality songs on Tidal than others. Do you say that Adi 2 will sound better than idsd micro even it lacks support of MQA? Thanks in advance!
 
Joined
Jul 13, 2019
Messages
18
Likes
3
Hi!

After using my ADI-2 DAC for a while I discovered the following problem:
When the sampling rate is changed through WASAPI, there's a loud pop in the left channel of the line out.
It never happens on the phones out, only on the line out, and only in the left channel.
It doesn't happen if the line out is muted either by turning the volume down to -inf dB, or by pressing the volume encoder.
But when volume is > -inf dB the pop is equally loud independent of the volume setting.
I can reproduce this with two WASAPI applications: foobar2000 and mpc-hc. The pop doesn't happen 100% of the time, sometimes to reproduce it I need to switch between two tracks with different sample rates a few times, happens every 1..3 sample rate switches.

I would really appreciate it if anybody tried to reproduce this behavior with their ADI-2 DAC to see if this is a common problem or a defect with my unit. For reference, my unit is on firmware version 26/30.

I could not reproduce this with ASIO and foobar2000, but because this only happens on the line out, I am assuming this is not a problem with WASAPI, but with the dac itself. Hopefully something that can be fixed through firmware.
 

VintageFlanker

Senior Member
Joined
Sep 20, 2018
Messages
390
Likes
535
Location
Paris
Do you say that Adi 2 will sound better than idsd micro even it lacks support of MQA? Thanks in advance!
How do you listen music with Tidal? PC, phone Mac? Is the RME shows higher sample than 44.1Khz?
I you using Roon, you get 24b - 48/88/96Khz from Tidal to the RME whatever it is MQA or not. I seriously doubt that it could be audible.

Also I don't know the linearity of the BL but it's SINAD shows a performance which is closed to 16b/44Khz CD playback anyway. The RME is a much better measuring unit, with or without MQA.
 

Willem

Senior Member
Joined
Jan 8, 2019
Messages
411
Likes
423
SINAD 112 dB as published in first post of this thread. In short, there is nothing to worry about - it is truly excellent. With its additional features, built quality and support I think right now this is the best DAC/preamp that money can buy. And it is not even the most expensive - far from it.
 

Willem

Senior Member
Joined
Jan 8, 2019
Messages
411
Likes
423
The manual gives the same specifications for all inputs. And of course they are all excellent and well beyond the human hearing threshold. On the output side xlr is a bit better of course.
 
Top Bottom