Under settings and picture and sound there is an offset setting so you can't adjust the sound to match the picture. This is also on your existing box if you wish to check exactly what it's called.
one further thought though are you using the supplied HDMI cable with the new box or the one you had with your old one? The new cable is higher rated and may solve this without the need for any adjustments.
Let us know how you get on.
Please remember to mark Solved Posts with Best Answer. Doing so helps other customers and saves TalkTalk's Support Team time by only looking at unsolved topics. Thanks, Steve (a fellow customer).
