Examples of sound manipulation

Echo can produce a powerful sonic scream.

Echo concentrates a sound into the Constrictor's right ear...

...resulting in a deadly blood spatter on the wall next to the other side of his head.
(Going Postal, Part 2)

Echo screams thwarts others, and causes debris to fall.

Echo can replicate the brown note, with disgusting results.
(Going Postal)

Echo stuns a disguised Penny with his scream.
(Going Postal)

Echo produces a sound...

...that shatters the ear bone responsible for balance and equilibrium.
(Going Postal)

Echo can convert other forms of energy into sound waves, such as electricity.
(Going Postal)

Echo's scream manages to stun Elle...

..but has little effect against a certain agent.
(Going Postal)

Jesse Murphy is able to use his power to blow the flesh off a person's skull.
(The Sting of Injustice)

While in Jesse's body, Peter accidentally uses Jesse's ability...

...and sends Flint flying.

Peter sends a shockwave towards Knox...

...knocking him off his feet...

...and sending office equipment through the air.
(One of Us, One of Them)

Jesse knocks people and objects away.
(The Sting of Injustice)