The user can cause objects to explode by expanding sound waves within an object or being, increasing the amounts of pressure on the sound waves until they burst open. The sound waves are compacted within the object or being, and are released out and become free when bursting the target open
Exploud and Loudred (Pokemon) using Hyper Voice to such intense effects that it causes the entire area to detonate from the sound waves.
Noivern (Pokemon) using Boomburst, creating powerful sonic waves that causes the area to explode, indiscriminately injuring all, incuding adjacent comrades.
Kanade Kamiya (Rosario + Vampire Season II) using his second form to boost his song's strength from a small noise spark to an explosive roar, as well as super heating the air around.
Black Canary (DC Comics)
Siryn (Marvel) can cause her vocal cords to vibrate over a wide range of sonic frequencies and produce a volume of sound ranging up to at least 140 decibels. Siryn has thus the ability to shatter solid objects with a sonic scream.