Which sound card to buy?

[Henryson]

My old MOTU Microbook II works rather well with Jamkazam. 
Microbook II has 5.6 ms input/out ("roundtrip") latency according to Jamkazam's Audio Configuration Report (press option-$ft-R on Mac):

Excellent: Less than 5 ms
Average: 5 - 9 ms
Poor: Greater than 9 ms


After the latest MacOS update, the Microbook needs to be replaced. And now I need "excellent" latency for my session.

Quest: a new portable sound card for $200-300, with less than 5 ms roundtrip latency.

I tried Focusrite Scarlett 4i4 3rd Gen, but I got around 12 ms, "poor".
Same thing with Steinberg UR22 MkII, around 12 ms.

Does anyone have info on roundtrip latency for different sound cards?
This info is oddly hard to find. 
Everyone talks about their "zero latency monitoring", which is something else altogether.

I've heard good things about Presonus, the Studio 24c and 26c for example.

[Dimitri Muskens]

My old MOTU Microbook II works rather well with Jamkazam. 
Microbook II has 5.6 ms input/out ("roundtrip") latency according to Jamkazam's Audio Configuration Report (press option-$ft-R on Mac):

Excellent: Less than 5 ms
Average: 5 - 9 ms
Poor: Greater than 9 ms


After the latest MacOS update, the Microbook needs to be replaced. And now I need "excellent" latency for my session.

Quest: a new portable sound card for $200-300, with less than 5 ms roundtrip latency.

I tried Focusrite Scarlett 4i4 3rd Gen, but I got around 12 ms, "poor".
Same thing with Steinberg UR22 MkII, around 12 ms.

Does anyone have info on roundtrip latency for different sound cards?
This info is oddly hard to find. 
Everyone talks about their "zero latency monitoring", which is something else altogether.

I've heard good things about Presonus, the Studio 24c and 26c for example.

>>>
Lots of info here:

https://forum.jamkazam.com/showthread.php?tid=196

[Henryson]

I tweaked sample rate, frame size and downloaded the Low Latency Installer,
so the Focusrite Scarlett 4i4 3rd Gen is now down to 4.5 ms, which is excellent.

Problem solved.

[Dimitri Muskens]

I tweaked sample rate, frame size and downloaded the Low Latency Installer,
so the Focusrite Scarlett 4i4 3rd Gen is now down to 4.5 ms, which is excellent.

Problem solved.

>>>
Ah, fair enough.
Reading your OP I figured you were way beyond that point.
Well done & enjoy jammin'