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  1. UliBru

    Next Level of Performance DACs.

    I do not believe in audio myths. But indeed I have noticed audio differences with different USB cables feeding my RME Fireface UC. A possible explanation: beside the transfer of digital information the cable can also transfer electrical noise, compensating current, act as an antenna and so on...
  2. UliBru

    Minidsp U-DIO8 USB to AES Converter Review

    Basically the channels can be assigned and routed arbitrarily. But this does not make sense. Of course I can tell you about the underlying concept in Acourate: Simply imagine you have directly connected your left and right tweeters at channels 1 and 2. Furthermore the tweeters are also directly...
  3. UliBru

    Minidsp U-DIO8 USB to AES Converter Review

    Usually a music player reads the samplerate of the music track and sends an according samplerate command to the soundcard. The U-DIO8 behaves the same way on AsioSetSamplerate like other soundcards.
  4. UliBru

    Minidsp U-DIO8 USB to AES Converter Review

    What do you mean by "i get the 48k drop down to 44.1k" ?
  5. UliBru

    Minidsp U-DIO8 USB to AES Converter Review

    I use the U-DIO8 with 4 TacT M/S2150 amps connectec by AES/EBU in a 4-way active horn speaker setup. There is no problem at all.
  6. UliBru

    Time Domain measurements?

    Yes, but many people do not understand the frequency domain in its full meaning. They just look e.g. at the frequency response plot of a loudspeaker. And this magnitude chart does not contain any time information, it simply shows the steady-state frequency behaviour. This typically leads to...
  7. UliBru

    Time Domain measurements?

    You also said before: "What I was trying to say (and believe that I did say in an adequately clear manner) is that if the low-pass filter that is applied is sufficiently steep, that there will be no remnant of the original 15 Hz fundamental in the output waveform, and that the overall...
  8. UliBru

    Time Domain measurements?

    I have simply tried to give an answer to your statement: "It will somewhat resemble a square wave, but one where the fundamental frequency is the 45 Hz " So if you take away the fundamental 15 Hz of your example the result clearly does not resemble a square wave.
  9. UliBru

    Time Domain measurements?

    A 15 Hz square wave consists of sine waves 15 Hz, 45 Hz (3*15), 75 Hz (5*15), 105 Hz (7*15) ... Now you take away 15 Hz and get a lowest frequency 45 Hz. So far ok. But 75 Hz is not 3*45, 105 Hz is not 5*45 ... Thus the filtered result is no longer a square wave.
  10. UliBru

    Time Domain measurements?

    Here is my result with 200 Hz squarewave and 80 Hz lowpass 12 dB/octave
  11. UliBru

    Time Domain measurements?

    Some examples of a truly bandlimited squarewave @48 kHz samplerate: 100 Hz 1500 Hz 7500 Hz The last example consists of 2 frequencies only - 7500 Hz and 22500 Hz. The next higher frequency of order 5 would be 37500 Hz but this is already outside of the bandwidth limit 24 kHz.
  12. UliBru

    Time Domain measurements?

    And if you measure your system with microphone and soundcard also keep in mind that the analog-digital conversion also limits the frequency range by brickwall filters (against aliasing) and samplerate (max. frequency is fs/2). So there are many good reasons why a squarewave measurement does not...
  13. UliBru

    Time Domain measurements?

    1. IMO it is misleading to create such squarewaves as they clearly hurt the Nyquist-Shannon sampling theorem. A squarewave consists of its base sinewave plus odd sinewaves 3rd, 5th, 7th, 11th ... order, see also https://en.wikipedia.org/wiki/Square_wave Now at e.g. 48 kHz samplewrate the top...
  14. UliBru

    Time Domain measurements?

    Here you go, the blue curve is the summed step response
  15. UliBru

    Time Domain measurements?

    The UB filters are based on the idea that kinks or non-smooth transitions in the frequency response cause some ringing in the time domain. Thus the target is to get smooth frequency responses. An indication is the behavior of derivatives, like kink (1st derivative) or jerk (2nd derivative). A...
  16. UliBru

    [No Politics] What you need to know about CoVID-19 by SARS-CoV-2 [No Politics]

    An animated statistic chart about Covid-19 https://public.flourish.studio/visualisation/2562261/
  17. UliBru

    Next Level of Performance DACs.

    I've never managed to trim out the deviations (linear and non-linear) to get a sum way below the noise floor. If the gains are not exactly the same you may even correct it on the digital side. Of course there are other possibilities, e.g. crosstalk and so on. IMO up to -60 dBFS (e.g. my RME)...
  18. UliBru

    Next Level of Performance DACs.

    Sorry, I have meant two channels, e.g. stereo channels, of a DAC chip. They should run in sync, at least theoretically.
  19. UliBru

    Next Level of Performance DACs.

    Hi Klaus, unfortunately the ADI-2 has only two channels :( Indeed there is some progress at RME. The ADI-2 now also seems to follow an external samplerate change correctly, the Fireface did not. But why is it necessary to add an external USB isolator and another power supply? Couldn't this be...
  20. UliBru

    Next Level of Performance DACs.

    My RME Fireface is e.g. reacting on different USB cables. BTW with an Audioquest JitterBug plus 5m USB cable it even denies to play :) But I mean DACs in general. With a DAC immune to quality of input signal (it's digital, isn't it?) all tweaking actions before (from good old CD treatment to...
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