Actually the Audio Engine are GREAT sounding and I use them in many instances, but they WILL NOT likely be usable with your Vizio.
Sony TV's sometimes allow you to shut the speakers off manually and still control volume via the TV Remote.
Most of the Vizios don't allow this, so you could use them, but you would have to control the volume manually.
Unless your Vizio is different than most of the other Vizio models, you need to check that before purchasing anything. Your idea to hook it up to your existing system will tell you.
Good luck.
Sony TV's sometimes allow you to shut the speakers off manually and still control volume via the TV Remote.
Most of the Vizios don't allow this, so you could use them, but you would have to control the volume manually.
Unless your Vizio is different than most of the other Vizio models, you need to check that before purchasing anything. Your idea to hook it up to your existing system will tell you.
Good luck.