[LAU] Focusrite 18i20 vs Behringer FCA1616/UMC1820 - Was: PreSonus 1818VSL vs Focusrite 18i20

[Ralf Mardorf]

Hi Olli,

thank you very much.

On Sun, 4 Dec 2016 15:39:55 +0100, Olli wrote:
>I haven’t adjusted any IRQ settings, just some minor, usual tweaks for 
>Arch Linux. Let me know if you want to know any additional details or
>if I should run any specifc query!

Usually I'm interested in MIDI jitter, but in this case there's no need
to run alsa-midi-latency-test for me.

There are just two other things I wish to know.

1. Are you using a first or second generation 18i20?
   I read that for the second generation, there should be issues
   related to the mixer.

2. Do I understand correctly, 64 samples cause more latency than 128
   samples?

>48 kHz, 256 samples, 2 periods:
>detected roundtrip latency: 1389 samples (28,938 ms)
>systematic latency: 621 samples (12,938 ms)
>
>48 kHz, 128 samples, 2 periods:
>detected roundtrip latency: 1239 samples (25,812 ms)
>systematic latency: 471 samples (9,812 ms)
>
>48 kHz, 64 samples, 2 periods:
>detected roundtrip latency: 1240 samples (25,833 ms)
>systematic latency: 472 samples (9,833 ms)
>
>48 kHz, 256 samples, 3 periods:
>detected roundtrip latency: 1389 samples (28,938 ms)
>systematic latency: 621 samples (12,938 ms)
>
>48 kHz, 128 samples, 3 periods:
>detected roundtrip latency: 1287 samples (26,812 ms)
>systematic latency: 519 samples (10,812 ms)
>
>48 kHz, 64 samples, 3 periods:
>detected roundtrip latency: 1390 samples (28,958 ms)
>systematic latency: 622 samples (12,833 ms)

Regards,
Ralf