Is this New Construction or Retro?

Several manufactueres make boxes to redirect TV sound to the rooms speakers. Not too difficult in Pre-wire phase..... As for Retro, Your in "Call a Professional" territory. (Actually either way, you SHOULD be talking to someone who can come out and SEE what needs to happen with what you describe here)

Freds right.. Your JVC will NOT hold up in this enviroment. Definatly need a real amplifier.