The JBL LSR310S is a professional 10-inch powered studio subwoofer designed to provide accurate, extended low-frequency reproduction for critical listening environments. Engineered to seamlessly integrate with JBL's LSR Series studio monitors, this subwoofer serves as the foundation for a full-range monitoring system, enabling producers, engineers, and content creators to accurately hear and evaluate the entire audio spectrum, particularly the crucial sub-bass frequencies that smaller nearfield monitors cannot reproduce. Its primary role is to extend the system's frequency response down to 27 Hz, ensuring that mix decisions regarding bass content, low-end dynamics, and overall spectral balance are made with confidence and precision.

The subwoofer features a dedicated 10-inch, long-throw driver powered by a built-in 200-watt Class D amplifier, which provides ample headroom and tight, articulate bass response. A key component of its design is the proprietary XLF (eXtended Low Frequency) electronic crossover and filter network. This sophisticated circuitry provides a continuously variable low-pass filter and phase control, allowing users to finely tune the integration between the subwoofer and the satellite monitors for a smooth, coherent transition. The XLF circuit is specifically optimized to minimize phase shift and group delay, preserving the transient accuracy and timing of the audio signal, which is essential for critical mixing and mastering work.

The enclosure is a compact, sealed design that minimizes port noise and provides accurate transient response. Input and output connections are comprehensive, featuring balanced XLR and TRS jacks to maintain signal integrity in a professional studio setup. The front-panel controls are intuitively laid out, offering adjustments for volume, low-pass crossover frequency, and phase. By combining a high-performance driver and amplifier with the intelligent XLF crossover technology, the JBL LSR310S provides a reliable and sonically transparent tool for achieving a complete and accurate monitoring system in project, post-production, and professional recording studios.