The PRX718XLF extended low frequency subwoofer was designed and engineered to provide sub bass frequencies with accuracy and power. Used as a single sub in a sub/sat system or in multiples as part of a scalable, large format sound reinforcement system, the PRX718XLF performs with exceptional efficiency and control. The subs are stackable and light-weight ensuring quick set-ups and tear-downs. And due to their rugged construction are perfect for AV rental inventories. With a pole receptacle (that accepts a SS4-BK or SS4-BK24) on the top panel and integrated stereo pass-thru this is the most powerful low-frequency complement to the PRX full-range systems. The addition of a polarity reverse option further enables system optimization.
The PRX718XLF is a high performance self-powered subwoofer system. The PRX718XLF is comprised of a powerful 2278G Differential Drive® dual voice-coil and magnetic gap, woofer driven by a 1500 Watt Class-D power amplifier. Sophisticated DSP is at the core of a fully featured input section, providing user selectable cross-over functionality, polarity optimization, protection, dynamic limiting and discrete component optimization.
All PRX700 cabinets are built from a combination of 25mm (on the top and bottom for added rigidity) and 18mm, strong, light-weight poplar plywood made structurally sound with tongue and groove joints. All PRX700 Series cabinets are protected by JBL’s tour proven DuraFlex™ finish. Grilles are made from dent-resistant 16 gauge steel and handles are made from light-weight glass-filled nylon for added strength and durability.
The amplifier input panel offers stereo inputs with XLR or ¼ inch jack compatibility. A user selectable crossover ensures a smooth transition to full-range system connected to the stereo outputs. Signal present and limiter lights indicate the system status and assist in setting the optimum level via the level control knob.
Frequency Range (-10 dB)
30 Hz - 103 Hz
Frequency Response (±3 dB)
35 Hz – 87 Hz
Internal Crossover Frequency
90 Hz DSP controlled 48 dB filter slope
Loop out Crossover Frequency
120 Hz analog 24 dB filter slope
134 dB peak
Limit: Yellow LED indicates peak output has been reached and dsp limiter is acting
Signal: Green LED indicates signal present
Power/Standby : Blue indicates system has power and ready to pass audio, Red indicates system has power but is in a power saving mode and will not pass audio.
Dynamic Control (Input)
dbx Type IV™ limiter circuit
20K Ohms (balanced)
normal or reverse polarity
1 x JBL 2278G 460 mm (18 in) woofer
Rectangular, 18 mm, plywood
Suspension / Mounting
M20 threaded pole socket on top
2 x injection molded handles with backing cup
Obsidian DuraFlex™ finish
Powder coated, Obsidian, 16 gauge perforated steel with acoustical transparent black cloth backing.
Two Balanced female XLR/ 1/4" combo connectors
Two balanced male XLR connectors.
Dimensions (H x W x D)
690.372 mm x 523.24 mm x 723.9 mm
(27.18 in x 20.60 in x 28.50 in)
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