Yesterday I got a Line 6 G10 wireless system so I spent some time to test it. Apart the sound quality (that is very good to me) I started to "feel" the latency.
Because ears are affected by suggestion I decided to spend some spare time to measure some latencies in the chain.
I splitted the signal: one direct in the Motu 828 mkIII and the other thru the G10 to the Motu and I recorded the two tracks in Cubase Pro 9.
The Motu had all the onboard effects off and I used only the line inputs (I measured on the mic/hi z inputs an extra latency so I didn't use them).
Because the software only measure the milliseconds, I calculated the fractions watching the distance to the next millisecond.
I used the waveforms for reference.
I started with the G10 and I measured about 2.8 ms
Than I disconnetted the G10 and plugged in the KPA with os 5.1.
I used the Main outs
First I measured the KPA without effects and without Amp section. Just conversion and Sens controls. 2.6 ms
Then KPA with only Amp section. 3.4 ms
And finally full loaded with Booster Flanger 3 delays (a loop dly, a Crystal, and a legacy) and Reverb
Incredibly the latency was only 3.7 ms. I couldn't believe it so I tried many times with various souces, I also rebooted all. but always the same result.
Of course the soundcard has its own latency like all digital mixers so I'll prefer monitoring on stage from the monitor out to avoid summing latencies.
I hope it can help someone
Daniele