I'm having a submarine themed theatre room and was wondering if there would be a way to have a sonar beep playing subtlety in the background while a movie is playing as well? I'm eying either the Onkyo 809 or 818 if that helps. Thanks.
A sonar ping isn't a very demanding sound and doesn't need a high fidelity sound system to sound good, so I would just buy a cheap desktop stereo or boombox and have it play a looped sonar ping. You can get cheap boom boxes for $20 or $30 off of craigslist or ebay. If you really want to play a sonar ping in your home theater speakers, you could play the movie off of a computer and have another application on the computer play sonar sounds. Otherwise you are talking about making the audio system setup a little complicated, as you would need to add a mixer into signal chain.
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