Quote Originally Posted by d6jg View Post
Technically yes but seriously NOT WORTH it. The lag on TV will be 2-3 seconds minimum and therefore unbearable.

Get a normal amplifier with multiple line inputs. Plug a Pi/LMS into one of its inputs and TV into another. Switch inputs as required. This is the only way you will get TV sound without unacceptable delay.
Can you recommend amplifier where I could plug a Pi/LMS into one of its inputs? How would I be able to 'control' the amplifier and switch between TV sound and LMS?

My current setup (which I inherited) was an Opus multi-room system with big clunky amps scattered around the house and this is what I want to replace (in fact some of the equipment has now broken).