A:Answer Here are my results after a thorough but completely unscientific test under quiet living room conditions.
I sat approximately 10 feet away from a new Sony 85 inch TV (with fiber optic hookup) and listened through my Sennheiser RS 175 headphones, and the TV, to 10 minutes of sharp noises (mostly gunshots at a private target range). If there was any sound delay at all it should have been quite easy to hear it. There was no delay that I could detect nor has there been during the 4 months that I've owned the headphones. For typical home viewing, the audio in the headphones matches the tv speakers (and the picture) beautifully. As a former announcer (not a degreed engineer though) I'm pretty picky about sound and these do sound great.