Thank you for reaching out and welcome to the community!
I would recommend ungrouping the speakers playing YouTube on one of the speakers then grouping while its playing to see if that improves your experience.
I hope this helps, have a great day!
Jessie O - Community Support
I'm sorry this did not resolve the issue.
Could you confirm what device you are trasmitting the audio from? You mentioned in the thread title it is your TV, if this is the case, have you tried another Bluetooth source such as your mobile device to see if there any delay with that at all?
Leon_C - Community Support
Thanks for coming back to us once again.
You should not be able to group TV audio on these systems. Are you using Youtube on a Smart TV? Have you connected your TV to the SB700 or HS500 via Bluetooth to achieve this?
I look forward to hearing from you!
I think the best solution for you is to get in contact with our tech support. If you CLICK THIS LINK and select your country of residence, scroll down and select "Contact Us" they will be able to assist you.
Have a great day!