Hybrid active designs exist such as having three drivers powered by two internal amplifiers.

It's too broad to span without internal amplifiers.

Devices that use a self-powered microphone: usually a condenser microphone with internal battery-powered amplifier.

There is no internal amplifier or speaker grill on the left.

The subwoofer contained four 15" drivers, crossover circuitry, and an internal amplifier based on the Grand Touring series design.

Most subwoofers are self-powered (with an internal amplifier) which means the receiver does not need to provide it amplification.

If your subwoofer doesn't have an internal amplifier, you'll definitely want to connect an amplifier to it.

They often have a low-power internal amplifier.

The internal amplifiers require an external power source, usually an AC adapter.

Output is provided in mono by a small (4 cm) built-in loudspeaker with volume control, driven by an internal amplifier.