[LAU] Zoom H5 jack_iodelay

[Paul Davis]

Remember that the systemic latency for all USB audio devices on Linux can
(and likely will) change every time the device is re-opened (re-used). This
is  a feature (bug) of the kernel USB audio class device support.

On Sat, Mar 20, 2021 at 11:07 AM Lorenzo Sutton <lorenzofsutton at gmail.com>
wrote:

> Hi David, all,
>
> Creating a new thread as the old one was pretty long...
>
> On 19/03/2021 15:22, David Kastrup wrote:
> [...]
>
>  >> - Zoom H5 shows 4 inputs in jack: the L/R mics and the inputs 1 and 2
>  >
>  > Oh, can you just put the headphones right next to the mics (makes
>  > astonishingly little difference in comparison to direct connections) and
>  > use jack_iodelay for measuring out the latency of the H5 with your
>  > settings?
>  >
>  > Numbers are surprisingly hard to come by for any audio interface.
>  >
>
> This is what I got by connecting jack_delay to one output and putting
> the headphone right in front of the microphones (connected only one to
> the jack_delay input). These are common jack settings I use or have used
> with this device, although the 32 Frames is very unstable and the 64
> Frames one gets a few xruns depending on what it's used with (but still
> more usable). The 128 Frames settings is very stable.
>
>     SR    Fr/p   Avg. delay reported (ms)
> ------+-------+-------------------------
> 48000
>         128,2   22.7
>         64,3    18.7
>         32,3    14.2
>
> 44100
>         128,2   25.2
>         64,3    20.6
>
> 96000
>         128,2   22.6
>         64,3    18.6
>
> 88200
>         64,3    18.6
>
> Hope this is useful /interesting
>
> Lorenzo.
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