You can go onto google images and see for yourself what a bass trumpet looks like. It is generally a larger instrument than the trumpet with a larger bore.

Nope. The double bass is a few octaves lower than the trumpet.

bass clef ya dumb

A bass trumpet sounds in the register of a baritone, exactly one octave below that of a normal b-flat trumpet. The bore size (diameter of the tubing) of the bass trumpet is considerably greater than that of a normal b-flat trumpet, and the bell size and slide length will all be similarly increased. The mouthpiece of the Bass Trumpet also resembles a Trombone/Baritone mouthpiece.

is it gizmo by datsik, that is a very bass heavy song that starts with a trumpet, listen to it and endure the bass!!!