LivingLikeLarry
New Head-Fier
So the black has no delay at all, I thought they all had some form of delay. I wonder if they are on different firmware versions by any chance did you try updating them it is possible the red one shipped with a different firmware version. You can check the FW version without going through the install: https://www.fiio.com/newsinfo/779363.htmlI wouldnt say its a dealbreaker but it was immediately noticeable when I plugged it in. I really like the color of the Red K7 but I will probably keep the Black one simply because it doesn't have any delay.