Listen to the sound clip Transformers XX1 from C3 Soundboard: Transformers XX1 Transformers XX1 This sound is from C3 Soundboard If you're a fan of the Transformers franchise, then you're probably familiar with the signature sound of C3. This iconic sound is a staple in the Transformers XX1 series, signaling the arrival of the formidable C3 unit. The sound of C3 is a po… Go to the full soundboardwith more sound clips Search