JBL 310S-MKIII: hear what happens in the lowest octave

The JBL 310S-MKIII is a 10-inch active studio subwoofer designed to extend the low-frequency response of JBL 3 Series MKIII monitoring systems. It is aimed at music production, content creation, post-production, and immersive audio, with a redesigned 250 mm woofer, 300 W Class D amplification, and extension down to 26 Hz (−10 dB).

When adjusting the relationship between kick drum and bass, reviewing cinematic effects, or working with immersive content, it allows you to clearly hear the lower end of the spectrum. Its new acoustic platform combines an improved magnetic system with a downward-firing driver and a bass reflex enclosure to deliver greater extension, output capability, and bass control.

Key features of the JBL 310S-MKIII

Redesigned 250 mm (10-inch) downward-firing woofer.

300 W Class D amplifier and low-frequency extension down to 26 Hz (−10 dB).

Proprietary Slipstream port with widening at both ends to reduce turbulence.

Selectable crossover at 80, 100, or 120 Hz, with an option for external management.

Balanced Neutrik Combo analog input to integrate professional equipment.

What makes the JBL 310S-MKIII special?

Extends low-frequency listening with an adjustable crossover to integrate into different studio setups. You can select 80, 100, or 120 Hz, or bypass the internal filter when using an external bass management system. Its balanced connection makes integration with audio interfaces, monitor controllers, and stereo, surround, or Atmos systems easy.

The Slipstream port reduces turbulence to keep the bass defined at different playback levels. The downward-firing woofer promotes more uniform dispersion and a consistent room response. Together with the 300 W amplifier, the system provides low-frequency headroom and reaches 116 dB SPL peak, measured in a half-space and with an external crossover.

The 18 mm MDF enclosure, structural ABS front panel, and 2 mm SPCC steel rear panel complete a construction with a matte black PVC finish, designed to fit into a production environment.