JBL PRX918XLF Active Subwoofer

JBL PRX918XLF — Professional Powered 18-Inch Subwoofer

The JBL Professional Powered 18-Inch Subwoofer is engineered for portable and installed PA systems that demand deep, controlled low-frequency output. Part of the PRX900 Series, it pairs a custom 918SG ferrite-magnet woofer with a 2,000 W peak Class D amplifier, reaching a maximum SPL of 134 dB. This model is the right choice for touring DJs, bands, rental houses, and corporate A/V providers who need reliable, room-filling bass in any scenario.

What sets the PRX918XLF apart

What separates this subwoofer from typical 18-inch powered designs is the marriage of a next-generation ferrite driver with a fanless Class D amp and ultra-low system latency under 1 ms. DriveRack Technology provides 180 ms of speaker delay in 100-microsecond increments for precise time-aligned systems in larger rigs.

Driver and amplification

The driver and amplifier pairing determines how a subwoofer behaves at the bottom of its range, and this instrument is built around components designed in tandem.

• LF Driver: 918SG 18" ferrite magnet woofer — high-excursion design for clean, defined bass at maximum volume
• For efficient power delivery, the unit uses a 2,000 W peak / 1,000 W RMS Class D amplifier with passive convection cooling and zero fan noise.

DSP and system control

The DSP package is accessible from the rear-panel color LCD or remotely via the JBL Pro Connect app over Bluetooth Low Energy.

• Parametric EQ: 6-band parametric EQ — system tuning and nuanced tonal control for any venue
• Crossover Frequency: 80 Hz / 100 Hz / 120 Hz selectable — matches the sub to top cabinets of different sizes

Connectivity and physical specs

The rear panel keeps signal flow simple with balanced combo inputs feeding XLR pass-throughs for daisy-chaining tops.

• Inputs / Outputs: 2 XLR/TRS combo inputs, 2 XLR pass-through outputs — balanced signal path with no Bluetooth audio streaming
• The enclosure is constructed from 18 mm birch plywood with optimized bracing, providing a rigid structure that resists vibration at high SPL.