Delay of the sound to a wi fi dac in the network

I installed the trial version, excellent sound quality, congratulations but I have a problem. I also installed Airfoil, because I have to share a dac connected directly to the mac with cable, and another one connected wi fi. Unfortunately the sound from the dac connected in wi fi arrives with a delay of about one second … I tried to reinstall twice, and re-read the FAqs, but I didn’t find any corrections in the settings. You can help me, otherwise I don’t think I won’t be able to buy it.