The waveforms that it is creating are very low frequency, which mean they take an extremely long time to even complete one cycle in terms of frequencies, thus it covers more ground as well. Take the speed of sound, divided by the frequency's hertz and you will get the distance it takes for that frequency to finish one cycle. For example, It takes a subsonic frequency in the 80hz range 15 feet to complete one cycle (standard subwoofers have a response of 20-200hz). A 2hz frequency would take 262 feet to complete one cycle. An acre is roughly 208 feet by 208 feet. So that means if you place your Biowave in the middle of your acre, employ a little high school math utilizing the Pythagorean theorem to determine the furthest point to any corner is 104squared, + 52squared = 13,520. The square root of 13,520 is 116 feet roughly. So we only have to be able to project this frequency 116 feet which means completing only one half of a cycle to cover the necessary distance, which isn't much at all.
And yes, it is similar to playing music with your plants. I almost guarantee based off these findings that using a decent sound system will give you *some* of the results, but not to this degree. A sub woofer does produce some subsonic frequencies. The frequencies that they are producing with the biowave are lower.