Paul, as you probably know, Dr. Keith Jones of Pure Fishing's research department wrote a book, KNOWING BASS, THE SCIENTIFIC APPRPACH TO CATCHING MORE FISH, which is a scientific study of the bass family.
In chapter 7, Hearing and Vibration Detection, Dr. Jones discusses the acoustics of water, bass' acoustic detectors, the lateral line system, the bass' ear, and what happens when a bass hears something and what do they do.
Of course, the data is deep into scientific data and physics which in many instances is over my head.
But Dr. Jones does explain the data as best as possible for the normal guy to understand what his research found out.
On page 115, Dr. Jones writes: "A third avenue for sound discrimination would be the temporal content, otherwise known as rhythm. Rhythm perception may be the bass' forte. Given their sensory equipment, bass seem better designed to detect acoustic transients (that is, sudden changes) than perform complex frequency or intensity analysis. Natural sounds are rarely continuous. Rather, they occur in series of beats and pulses intermixed with dead spots. The regular tail beats of swimming shad and the thump a crawfish makes flicking its tail to escape have two distinct rhythms. By focusing on the rhythm rather than the actual sound frequencies, bass could potentially discern one prey from another, or prey verses non-prey."
In other words, bass can hear and feel vibrations caused by our baits. And many of the older ones can differentiate between a natural prey and a non-prey sound.
The bass will hear the noise (sound travels 4,920 feet per second in all directions in the water); feel the vibrations; and then go sight hunting to put their eyeballs on the item making the noise and vibration.
If all goes as planned: bass hears noise and faces its direction; bass feels the vibrations; and then bass swims over to see what is making the racket to decide it wants to eat or kill what it is seeing; we will then get a strike.
Dr. Jones' book is out of print. I spoke with him a few years ago and asked him to get a second run printed but he was not excited about doing that for some reason. You can find the book on Amazon or eBay for a lot of money. I doubt your local library has the book but if it does, I suggest you read it and garner a lot of great scientific information.
Enjoyed your reply above. I did not take the time to delve into the frequencies bass can hear but it is in the book on page 108, with a chart called Provisional Hearing Curve for Largemouth Bass.
What I found to be very interesting is Dr. Jones came to the conclusion that when a bass rushes up to your bait and then turns away, we always thought it was because of color or how it looks. Dr. Jones thinks it may be due to the vibrations your bait is sending having a greater input on why the fish does not hit the bait and swims away.
Go figure.