Horn Identification Question

On the Air Horns of Texas website, the audio file for the K3LA sounds different than any other video I can find online. Is this the wrong audio file associated with the horn? Perhaps it is the alignment of horns that changes the sound. Please help me find this horn because that is the sound I am looking for for my first purchase.

Link to K3LA page (Audio clip at bottom of page):

http://www.airhornsoftexas.com/collections/train-air-horns/products/nathan-k3la

This is really close to authentic:

https://www.youtube.com/watch?v=VyxbgQSio4Y

My K3LA with 8.5 gallons of air.

-Kris