Re: [LAU] Sound quality of the Focusrite Scarlett 18i20 2nd Gen

On Sun, 8 Jan 2017 23:29:31 +0100, Johannes Kroll wrote:
>Would still be interested in the comparison recordings you
>mentioned.

I couldn't use the same cables for the RME and the Focusrite test, the
cables used for the Focusrite were better, newer, shorter. However,
directly connecting the Focusrite by a balanced cable to itself,
there isn't audible anymore, what still is audible, when connecting the
RME and the Focusrite to other equipment by unbalanced cables. I've got
an Ardour5 test as 179M tar.gz and could send it of list to some
people, if you off-list ask me to do so.

I'll sent it to you Johannes, you don't need to ask.

More details, especially important in regards to the level of the
Focusrite:

[rocketmouse@archlinux ~]$ uname -rm
4.8.13-1-ARCH x86_64
[rocketmouse@archlinux ~]$ rtirq status

  PID CLS RTPRIO NI PRI %CPU STAT COMMAND
  121 FF 90 - 130 0.0 S irq/19-ehci_hcd
  126 FF 90 - 130 0.0 S irq/16-ohci_hcd
  146 FF 89 - 129 0.0 S irq/17-ohci_hcd
  151 FF 88 - 128 0.0 S irq/17-ohci_hcd
  271 FF 85 - 125 0.0 S irq/18-snd_hdsp
   32 FF 50 - 90 0.0 S irq/9-acpi
   48 FF 50 - 90 0.0 S irq/8-rtc0
   74 FF 50 - 90 0.0 S irq/26-radeon
  111 FF 50 - 90 0.0 S irq/1-i8042
  128 FF 50 - 90 0.0 S irq/14-pata_ati
  129 FF 50 - 90 0.0 S irq/15-pata_ati
  135 FF 50 - 90 0.0 S irq/22-ahci[000
  249 FF 50 - 90 0.0 S irq/7-parport0
  970 FF 50 - 90 0.0 S irq/27-enp3s0
    3 TS - 0 19 0.0 S ksoftirqd/0
   17 TS - 0 19 0.0 S ksoftirqd/1

[rocketmouse@archlinux ~]$ pacman -Q ardour5 jack2
ardour5 5.5-1
jack2 1.9.10.r202.gf2ece24-1
[rocketmouse@archlinux ~]$ cat .jackdrc_rme_hdspe_aio
/usr/bin/jackd -dalsa -dhw:HDSPMx579bcc -r44100 -p256 -n2
[rocketmouse@archlinux ~]$ cat .jackdrc_scarlett18i20
/usr/bin/jackd -dalsa -dhw:USB -r44100 -p256 -n2

1.

[rocketmouse@archlinux ~]$ $(cat .jackdrc_rme_hdspe_aio) >/dev/null
2>&1 & qjackctl & ardour5 >/dev/null 2>&1

05-weather_with_you/audio_out 1 -------> playback_1
05-weather_with_you/audio_out 2 -------> playback_2
capture_1 -----------------------------> rme unbalanced/audio_in 1
capture_2 -----------------------------> rme unbalanced/audio_in 2

unbalanced outputs were connected with unbalanced inputs

hdspmixer controls were set to 0.0 and -∞

qjackctl did show no xruns

2.

[rocketmouse@archlinux ~]$ $(cat .jackdrc_scarlett18i20) >/dev/null
2>&1 & qjackctl & ardour5 >/dev/null 2>&1

05-weather_with_you/audio_out 1 -------> playback_5
05-weather_with_you/audio_out 2 -------> playback_6
capture_3 -----------------------------> focusrite balanced/audio_in 1
capture_4 -----------------------------> focusrite balanced/audio_in 2

balanced outputs were connected with balanced inputs
btw. the first time I used the Focusrite balanced instead of unbalanced

the input pots of the focusrite were set to 0
this isn't the optimal level, but the only way to visually ensure that
left-right-balance is correct

qjackctl did show 0(2) xruns

Regards,
Ralf
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Received on Mon Jan 9 20:15:02 2017