But a hackier way would be to build a parametric speaker that focuses soundwaves into a narrow beam like [Shane] did with this ultrasonic sound gun. As the directivity of a soundwave depends on ...

If two microphones, each having a figure-of-eight or cardioid directional characteristic ... second-order pressure gradient in the incident sound wave; the directivity of such a system will ...

That's when you spring for a soundbar and add in directional sound with powerful highs and lows. The Denon DHT-S218 2.1 Channel Soundbar is currently on sale for $185 at Amazon, get it now to save ...