Hello,
I have a setup intended ONLY for spotify playback. I can never stop optimizing (see below), though it is running great 😉
System description:
Spotify (Streaming quality set to "very high", no "normalize" or any other function is enabled that could mess with the sound) on an older Linux Mint Laptop (I have defined "src-sinc-best-quality" in /etc/pulse/daemon.conf, though I do not know if it is resampling at all), connected over USB2.0 cable to -> Lexicon Alpha Studio, connected by 2 balanced analogue cables to -> DriveRack 260 (doing XOVER, delay match, EQ), connected by 3 balanced analogue cables
to Gisen audio D 4.15 4 channel class D (2 signals left and right > 100Hz, 1 signal mono bass <100Hz. I modded the amp and wired the chan 3 amp-input internally to channel 3 AND 4 power modules to support both my subs equally without the need of working with 2 attenuators).
Performance:
I can only do clean sweep tests using clementine, since my spotify does not support .wav.-files This is contrary to the system being intended to playback Spotify only, I know that.
I have created a perfect .wav-file that does 1Hz - 22049Hz at 0dB ascent sweep in linear way, sampled at 44100Hz, 16 Bit (I can share that one, in case someone is interested). The reason for 44100 was, that I think, Spotify will play in 44100Hz, when set to "very high quality", right?
I can hear the sound going up, until I can't any more (my ears are not very good). Just as the playback reaches ~21kHz, the system (actually the tweeters) starts to do some "whizzing" siren-like sound, that clearly should not be there at all. Since I cannot hear >15kHz at all, and I can clearly hear that artefact / aliasing noise, it is below 15kHz! Other that that, the whole system is working perfect. BTW, I know, 21kHz playback at full 0dB scale is not a typical use case, since most Spotify music does not contain > 20kHz at all, let alone at that level.
Questions: Is it true that Spotify is streaming 44100? What "target rate" for Lexicon Alpha Studio should I aim at? I guess, the DriveRack is doing 48kHz, right? Could not find that info within the whole internet... If so, aiming for the audio interface to do 48000 would maybe risk a "beating" in case the "48000" of the interface and the "48000" of the DSP are not exactly same, but a few Hz apart, right? So best aim is to stay 44100 until the audio interface with no any pulseaudio resampling, right? That is maybe what I am doing right now, but how can I know what pulse is doing actually? And where exactly could the whizzing enter the signal chain, when 21000 - 22000 Hz is being played?
I have a setup intended ONLY for spotify playback. I can never stop optimizing (see below), though it is running great 😉
System description:
Spotify (Streaming quality set to "very high", no "normalize" or any other function is enabled that could mess with the sound) on an older Linux Mint Laptop (I have defined "src-sinc-best-quality" in /etc/pulse/daemon.conf, though I do not know if it is resampling at all), connected over USB2.0 cable to -> Lexicon Alpha Studio, connected by 2 balanced analogue cables to -> DriveRack 260 (doing XOVER, delay match, EQ), connected by 3 balanced analogue cables
to Gisen audio D 4.15 4 channel class D (2 signals left and right > 100Hz, 1 signal mono bass <100Hz. I modded the amp and wired the chan 3 amp-input internally to channel 3 AND 4 power modules to support both my subs equally without the need of working with 2 attenuators).
Performance:
I can only do clean sweep tests using clementine, since my spotify does not support .wav.-files This is contrary to the system being intended to playback Spotify only, I know that.
I have created a perfect .wav-file that does 1Hz - 22049Hz at 0dB ascent sweep in linear way, sampled at 44100Hz, 16 Bit (I can share that one, in case someone is interested). The reason for 44100 was, that I think, Spotify will play in 44100Hz, when set to "very high quality", right?
I can hear the sound going up, until I can't any more (my ears are not very good). Just as the playback reaches ~21kHz, the system (actually the tweeters) starts to do some "whizzing" siren-like sound, that clearly should not be there at all. Since I cannot hear >15kHz at all, and I can clearly hear that artefact / aliasing noise, it is below 15kHz! Other that that, the whole system is working perfect. BTW, I know, 21kHz playback at full 0dB scale is not a typical use case, since most Spotify music does not contain > 20kHz at all, let alone at that level.
Questions: Is it true that Spotify is streaming 44100? What "target rate" for Lexicon Alpha Studio should I aim at? I guess, the DriveRack is doing 48kHz, right? Could not find that info within the whole internet... If so, aiming for the audio interface to do 48000 would maybe risk a "beating" in case the "48000" of the interface and the "48000" of the DSP are not exactly same, but a few Hz apart, right? So best aim is to stay 44100 until the audio interface with no any pulseaudio resampling, right? That is maybe what I am doing right now, but how can I know what pulse is doing actually? And where exactly could the whizzing enter the signal chain, when 21000 - 22000 Hz is being played?