Lord Decibel is a minor antagonist of the reboot TV series, Ben 10. He first appeared in the episode, Don't Let the Bass Drop.
Don't Let the Bass Drop
Lord Decibel flung the DJ of the stage concert and started his own beat using soundwaves that can destroy everything, but Ben later fought by focusing on the sound frequency in order to analyze when to attack. He did it and defeated Lord Decibel.
Lord Decibel appeared as an armored man with clothes outside. He also has a helmet with a screen with purple 8-bit that can form a smiley face
He is a sadistic type, since he loves to hear people scream.