Active HiFi speakers have a built-in amplifier. Compared to passive speakers, these don't need a separate amplifier to produce sound. This way, you don't have to use with extra wires or devices. Some active HiFi speakers have A built-in streaming technology. You can wirelessly control your speakers via an app on your smartphone or tablet. Choose 2 HiFi speakers to create a stereo set. Prefer to listen to surround sound? Add 2 more rear speakers.