Heinrich's H15-2S is a bass loudspeaker designed for use with external power amplifiers, frequency crossovers, and controllers. The H15-2S utilizes the backloaded dual port technology, which is a design by HEINRICH Limited that has been established and proven in the professional audio field. This technology provides a more precise bass reproduction through controlled transient response and an extremely deep cabinet tuning, offering superior performance compared to simple bass reflex contractions. The powerful 15-inch 2 loudspeaker has a high efficiency factor, generating high-quality sound with linear cone excursion.