JBL's ASB6128 is a front-loaded, high power subwoofer system with a vented configuration for extended bandwidth and high output. It's comprised of two 460 mm (18") SVG Super Vented Gap low frequency drivers.

Applications
Performing arts facilities
Theatrical sound design
Auditoriums
Houses of worship
Live clubs
Dance clubs
Sport facilities
Themed entertainment venues

Features:
Large vent area for high output
Parallel / Discrete switchable
Specifications
Frequency Range: 28 Hz - 1 kHz (-10 dB)
Frequency Response: 35 Hz - 1 kHz (±3 dB)
Input Modes: Drivers Parallel / Drivers Discrete
Transducer Power Rating (AES): 2400W (9600W peak), 2 hrs
Long-Term System Power Rating (IEC): 1600W (6400W peak), 100 hrs
Maximum SPL:
30 Hz - 100 Hz: 136 dB-SPL cont avg (142 dB peak)
100 Hz - 500 Hz: 136 dB-SPL cont avg (142 dB peak)
System Sensitivity:
30 Hz - 100 Hz: 102 dB
100 Hz - 500 Hz: 102 dB
Nominal Impedance:
4 Ω in Parallel-drive mode
2 x 8 Ω in Discrete-drive mode