21 of the Top Subwoofers for a Thumping Home Theater Sound System
James Loudspeaker ST21-4
Compatible with 70-volt and 4-ohm types of systems, the ST21-4 is a 21-inch subterranean subwoofer that James Loudspeaker developed for high SPL applications. Driven by the company’s M1000 amplifier, the sub amp provides the ST21-4 1,000-watts of power at 4 ohms to support its ability to play down to 18Hz.
