What adaptations would an aquatic humanoid species need to develop sonar?

So, I have an aquatic humanoid species that I want to be able to use echolocation. They are extremely similar to humans,with some minor differences, like gills. (The reason I include this tidbit is because I understand that dolphins use their jaw to channel sounds to their ears.)

A problem I've run into is that I don't really know what makes whales and dolphins good at using sonar. I know humans can develop a kind of echolocation, especially if blind, but as I understand it sounds above water are very different from sounds in it.

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What adaptations would an aquatic humanoid species need to develop sonar?

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