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PRX400 Series 18" subwoofer

Item #: 855PRX418S

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1 Review

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PRX 400 Series

JBL designed their PRX400 Series passive speakers with the high power handling and extended frequency response required by nightclubs, DJs, churches, concerts, and other applications. These speakers house JBL's road-tested components in rugged, road-worthy enclosures, so you can expect reliable performance night after night.

Bass in your face

The PRX418S subwoofer houses a JBL Selenium SWS1000 18" woofer in a compact, ported, hardwood enclosure, handling up to 800 watts continuous power (or 3200 watts peak). Properly amplified, this subwoofer will bring a whole new dimension to your performance, where the audience hears and feels the low notes.

Bang for your buck

JBL built the rugged enclosure from 0.7" birch/poplar laminate with an 16-gauge steel grille and JBL's DuraFlex finish. A 36mm pole mounting socket allows the JRX218S to serve as the base for a mid/high speaker cabinet, like JBL's PRX415. The JRX218S offers the performance and durability JBL is known for in a tough, compact package. It's a convenient way to go way down deep.


  • compact PA subwoofer
  • JBL Selenium 457 18" woofer in vented enclosure
  • rugged birch/poplar laminate cabinet with steel grille
  • top-mounted 36mm pole receptacle for stacking cabinets
  • power rating: 800 watts continuous, 1600 program, 3200 peak
  • frequency range: 52-120 Hz
  • max SPL: 124 dB
  • impedance: 8 ohms
  • recommended crossover frequency: 80 Hz
  • two parallel Speakon input connectors and two 1/4" phone jacks
General features:

Should I get a powered or non-powered sub?

For small-to-medium venue applications, a powered subwoofer will give you the low-end thrust your music deserves. These self-contained systems are designed to get the most output possible from their built-in amplifier and sub. So, when you're shopping, we suggest you pay more attention to the listed sound pressure level (SPL) ratings than the listed wattage ratings. For larger spaces and/or bass-heavy presentations, you'll need the power and projection you can only get from separate amplifier and sub. For a non-powered sub, you can safely use an amplifier whose continuous power output is rated up to double the rated program power capacity of the sub.

JBL PRX418S Reviews

Average Customer Review:

1 Review

Best Sub at the price

Written by: RMB38 from California on April 23, 2015

Crutchfield Customer Review (What's this?)

I replaced a 20-year-old 15-inch JBL sub with the PRX418S, and the difference is amazing. This is in a home theater/audio system, and I power the sub with 500 watts from a McIntosh amplifier. It's great!

Pros: This subwoofer is VERY efficient, and solid enough to avoid vibration noises. Cabinet is attractive enough for a home theater application.

Cons: Can't think of any.

Hands-on research

What's in the box?

Features and Specs

Drivers per speaker 1
Woofer Size (inches) 18
Tweeter Size (inches) N/A
System Frequency response 52-120Hz
Maximum SPL 124
Built-in Amplifier No
RMS Power rating N
Program Power rating N
Peak Power rating N
Mic Inputs N
Line Inputs N
Tone Controls N
Width (inches) 21-1/8
Height (inches) 26-3/4
Depth (inches) 24-1/4
Weight 79 lbs

Product Research


18" Woofer: The JBL PRX418S passive subwoofer system features an 18" woofer in a vented enclosure that can handle up to 800W continuous and 3200W peak.

DuraFlex Enclosure: The JBL PRX418S's cabinet features a tough DuraFlex finish with a heavy-duty 16AWG protective steel grille to protect the speaker components.

Input/Output Connectors: The PRX418S sub is fitted with a Speakon NL4 connector and a 1/4" TS phone plug connectors. There is also a parallel identical Speakon NL4 and 1/4" connector that facilitates a loop-through connection so you can daisy-chain and power an additional subwoofer.

Pole-Mount Socket: A top mounted, cast aluminum 35mm pole mount receptacle can receive an optional SS3BK pole (sold separately) to facilitate use of the PRX418SS as a base for a mid-high speaker cabinet.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

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