There may be a less complicated alternative for you. I have my TV set up so the line analog audio-out jacks from the TV go to an inexpensive AR wireless headphone base unit. My son is a night owl and when he visits he used to watch TV with the volume too high (I'm a light sleeper.) So I rigged the wireless headphone setup. All he has to is put on the headphones and mute the TV speakers. This arrangement bypasses the AV receiver, amps, surround system, everything. He's not mechanically inclined so it's perfect for him and I get my sleep.
If your TV has a headphone output, you could use a wired headset as a cheapo solution instead of the above.
Axiom Resident Expert