Yes, it is possible to make a speaker that generates a sound wave with the same frequency but in the opposite direction (180 degrees out of phase) to cancel out another sound wave. This technique is called active noise cancellation (ANC). It works on the principle of destructive interference, where the peaks and troughs of the two opposing sound waves align and cancel each other out, effectively reducing the overall sound level.

Active noise cancellation is commonly used in noise-canceling headphones and certain automotive systems to reduce unwanted noise. However, it is most effective for continuous, low-frequency noise, and less effective for sudden or high-frequency sounds due to the complexity of matching and canceling the waves accurately in real-time.
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