Sealed small subwoofers use an enclosed cabinet for controlled, clean bass and can fit well in compact indoor installations, while ported designs use a tuned opening to extend low-frequency output but need clearance around the port. Passive-radiator subwoofers use a tuned diaphragm instead of an open port, which can support bass enhancement in compact enclosures, though the radiator’s movement and mounting position should be considered during installation.

Choose a powered small subwoofer when you want the amplifier built into the enclosure, along with features such as wireless connectivity or room equalization on select models. Choose a passive small subwoofer when your system already includes a suitable amplifier, including low-impedance or 70V equipment, and you want to manage amplification separately.

For low-impedance systems, verify the subwoofer’s impedance, voice-coil configuration, amplifier load capacity, and connection to the main speakers, including whether satellite outputs and a built-in high-pass filter are available. For 70V systems, select a subwoofer designed for high-impedance operation, confirm that the amplifier supports the required distributed-audio connection, and check whether the subwoofer includes an amplifier or requires a separate one.

When installing small subwoofers indoors, consider cabinet size, placement, amplifier requirements, and whether a sealed enclosure fits the room and system design. For outdoor or discreet installations, select a model designed for the environment, such as a burial subwoofer with IP67-rated hardware, and plan the location, wiring, and crossover with the satellite speakers.