Thanks! You will need a loopback cable - connect physical output with a physical input. For example take a jack-jack cable, insert into Mic/Line input 8 and Line output 8.
Then there are two options:
1) Ardour - when starting up, usually Audio/MIDI Setup window opens, choose Audio system "ALSA", Input device Evo16, Output device Evo16, Sample rate 48 kHz, Buffer size as low as possible without getting sound artifacts, Periods 3. (You may want to experiment with sample rate, buffer size and periods and see how they change the latency); then -> Advanced settings -> Calibrate Audio -> Playback channel choose Line Output 8, Capture channel choose Mic/Line Input 8, then click Measure button. After a brief beep-tone you'll get systemic latency and round-trip latency (RTL) in [ms]. Let us please know the numbers
Then you may want to go ahead and use your measurement to let Ardour compensate the latency.
Note the the actual number of Input / Output Latency samples may change when you reconnect the interface.
2) JACK only - let me know if the above mention won't work, this one is I think less convenient and can result in a tad bit higher RTL
No, your USB controller's chipset. That one where you connect the Evo into. For example Renesas uPD720201:
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marek@desktop:~$ lspci | grep Renesas 03:00.0 USB controller: Renesas Technology Corp. uPD720201 USB 3.0 Host Controller (rev 03)
...or Fresco, Intel, AMD, VIA...