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jack_load -i "-dhw:2 -q0 -n2 -p128 -r48000" 2i2 audioadapter
I can use the q-parm (quality) up to 4. 0 means linear interpolation, 4 means sinc best quality and a whole bunch of CPU load that needs -p512 (as I found in jackd's source code).
The resampling is only needed because the 2 interfaces cannot be synced. But since the signal gets resampled from 48000 to 48000 I doubt that the quality parm is important. There is nothing to be interpolated as I understand.
So I guess -q0 is perfect in this case. I can't hear a difference to -q4, though. What do you think?