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RTJ 18 Quad Subwoofer

Quad Modular Subwoofers

Key Features

  • 4x 18″ Sub Module
  • 2x 4000w External Amplifier
  • 10hz-200hz (In Room)
  • 20 amp @ 120 volts (¼ Power)





JTR Speakers does not disappoint with the RTJ Audio line developed strategically for a unique and ultimate home theater experience. Purchase these outstanding subwoofers individually or in quantities of 2 and 4. In this Quad model, you get four (4) 18 series subs which are passive and two (2) 4000w rack mountable amplifiers. Moreover, combine with other speakers in this line to build the ultimate home theater experience. In short, any speaker in this line is of the finest fidelity and delivers maximum dynamics.

  • Small and Modular: The floor standing speakers and subs were specifically designed to have the same footprint. So, at 15" they are stackable and also shallow enough to maximize your space.
  • Ultimate Soundscape: These high quality speakers produce monumental and majestic sound.
  • Impressive Construction and Finishing: All cabinets are made to order in the U.S.A constructed in Baltic Birch and finished in a striking non-reflective black textured paint.

Since this product is Made to Order in the U.S.A, it will require some lead time. Contact us today and we will help you create your very own RTJ Audio system. 

Product Highlights

  • 4x 18" Sub Module
  • 2x 4000w External Amplifier
  • 10hz-200hz (In Room)
  • 20 amp @ 120 volts (¼ Power)
  • Combine with more from this line (sold separately): RTJ 410, RTJ 410 Stand, RTJ 110, RTJ 110-IW

Dimensions and Warranty

  • 22.5" x 22.5" x 15" (Each Module)
  • Warranty: 5 Year Manufacturer Defect
  • Our 30-day money-back guarantee
  • MFR # 18Sub Quad

Additional information


RTJ Audio

Frequency Response

10hz – 200hz (In Room)

Low Frequency Point


Dimensions (H x L x P)

22.5" x 22.5" x 15" each


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