Used JBL PRX518S units offer the punch of an 18-inch self-powered subwoofer in a compact package comparable in size to a typical 15-inch sub, built around a Crown Class-D digital amplifier with onboard DSP. The second-hand PRX518S is a popular choice for portable sub-satellite setups thanks to its integrated pole mount and stereo loop-thru. Browse the used JBL PRX518S listings available below to find the right unit for your rig.
No listings currently in stock. This page stays live — check back or register interest.
0 listed right now — list yours to the buyers searching this model.
Get an email when a new JBL PRX518S is listed.
JBL PRX518S specifications
| Brand | JBL |
| Segment | Audio |
About the JBL PRX518S
The JBL PRX518S is a self-powered 18-inch subwoofer featuring a Crown Class-D digital amplifier with DSP, a selectable crossover, dynamic limiting, component optimisation and a polarity reverse option for system fine-tuning. Professional XLR and quarter-inch Mic/Instrument inputs are provided, along with stereo input and loop-thru capability with a selectable high-pass filter, making it a natural complement to PRX500 series full-range cabinets. A 36mm top-panel pole receptacle enables easy sub-satellite configuration. The plywood enclosure is finished in JBL's DuraFlex coating and protected by a CNC-machined steel grille with acoustically transparent foam lining. An illuminated logo provides clear power-on indication.
JBL PRX518S — buyer FAQs
What is the JBL PRX518S and what makes it different from a standard 18-inch subwoofer?
The JBL PRX518S is a self-powered 18-inch subwoofer built around a Crown Class-D digital amplifier with onboard DSP. Its notable characteristic is its compact enclosure, which is not much larger than a typical 15-inch sub, making it easier to transport without sacrificing the output of a full 18-inch driver. The plywood cabinet uses JBL's DuraFlex finish and a CNC-machined wrap-around steel grille with acoustically transparent foam lining.
What inputs and signal routing options does the PRX518S provide?
The PRX518S accepts signals via professional XLR and quarter-inch Mic/Instrument inputs, and supports stereo input with loop-thru capability. A user-selectable high-pass crossover filter lets the full-range signal pass to satellite speakers, and a polarity reverse option allows further system optimisation. This makes it straightforward to integrate into a larger system without additional signal processing hardware.
What is the PRX518S typically used with in a sub-satellite configuration?
The PRX518S is designed as a complement to PRX500 series full-range cabinets. A 36mm pole receptacle on the top panel accepts a speaker stand, allowing a full-range cabinet to be mounted directly above the sub. Pairing with a PRX512M or PRX515 is a common configuration, producing a portable, self-contained sub-satellite system suitable for mobile use.
Who makes the JBL PRX518S and where does it sit in the JBL range?
The JBL PRX518S is made by JBL Professional, an American loudspeaker manufacturer founded in 1946 and part of Harman International, owned by Samsung Electronics. JBL Professional covers live sound PA systems, studio monitors and cinema loudspeakers. The PRX518S sits within the PRX500 series, a range of portable powered loudspeakers and subwoofers designed to work together as integrated systems.
What should I check when buying a second-hand JBL PRX518S?
On a used PRX518S, confirm the Crown Class-D amplifier powers up correctly and the illuminated logo functions as a power indicator. Check the DSP controls, selectable crossover and polarity switch all respond properly. Inspect the DuraFlex finish and wrap-around steel grille for damage, and verify the top-panel pole mount socket is undamaged. Every listing on this page carries a 21-day warranty covering major functional faults; full buying guidance is at https://www.10kused.com/used-av-equipment-guide/.
