Do I need a separate receiver for Audioengine powered speakers?

Nope! Audioengine powered speakers have amplifiers built-in. This means you don't need any extra equipment, other than a source to play music on (smartphone, tablet,  computer, CD player, turntable, etc). Just plug your source directly into the inputs on the rear panel of the left speaker with the included cables, or connect to them via Bluetooth, and voila! You're listening to music!