Still not 100% sure what you mean with sound delay.
The latency for the audio link is set to 42ms which is noticeable and audible but if this can be tolerated is off course up to the customer.
Try something lower for the latency setting and see if this is more acceptable. If the cable replacement is used in any lip sync applications (video) then you will need something like 20ms to have something that is acceptable.
The tradeoff with reduced latency is less range/robustness for the audio link.
Regards.
Kjetil