MTX RFL15 picture


38cm (15") 3500W RMS 2Ω Subwoofer with Ø100mm (4") single voice coil, 14Kg (500oz) magnet structure, aluminum reinforced frame and 35mm thick front & back plates


The MTX RFL15 subwoofer is the worthy heir to a line of extreme subwoofers. In 2002, the RFL152 with multiple SPL records, in 2005 the Jackhammer22 (Pimp My Ride), the biggest and heaviest sub ever marketed (165Kg diameter 56cm), in 2005 the Jackhammer24 the largest square subwoofer ever marketed...
The RFL15 surpasses all of its ancestors... It is the very best. Not one technology has been spared it. All the best materials are gathered around its cradle!

  • Gigantic magnetic structure with more than 14Kg of strontium… Perhaps the largest on the market
  • Chassis in the purest MTX T8000 style, but ultra reinforced. The original T8000 chassis weighs 1200g. That of the RFL passes 3200g… All the hollow parts are filled, all the arms of the frame have doubled in volume, the contact with the upper circle is ultra reinforced.
  • 35mm thick front plate (It measured 8mm on the older T9500s). This is what it takes to pass the enormous magnetic flux generated by the magnet and control the coil like no other subwoofer can.
  • 35mm thick rear plate.
  • 100mm (4") BASV voice coil support. The strongest available on the market…
  • 4-layer coil for extreme power handling.
  • Flat wire to better fill the air gap and obtain better reactivity.
  • Aluminum wire (for the weight), plated with copper (to pass the intensity) of the CCAR type.
  • The varnish which insulates the wire from the spool supports 280°C.
  • Double screwed Nomex spider for easier replacement and more precise assembly.
  • Paper membrane with ultra rigid fiberglass dust cover.
  • The top suspension is capable of handling over 90mm of travel.
  • Cone and suspension with double stitching of red thread.
  • Single coil with 2Ω impedance easier to connect and configure.
  • Symmetrical terminal blocks accepting 10mm2 cables.
  • Cables terminal blocks-coils double is sewn on the spider to easily follow the deflections of the membrane.
  • The weight of the RFL15 reaches 38kg.
  • It comes in a wooden crate because the cardboard would not be enough.
  • You need a hand truck or a pallet truck to move it.
  • Its parameters are optimized for use in bass-reflex boxes.
It is built to reproduce music at a very high sound level, with force, and a riot of sensations. The RFL15 has nothing to do with the toys found in the sandbox... RFL stands for "Really Fu... Loud"! Welcome to the extreme world, for real...


  • Very high performances superwoofer
  • Total weight: 38Kg
  • Delivered in a wooden box
  • 14Kg (500oz) magnetic structure weight
  • 3,2Kg super reinforced aluminum frame
  • 100mm (4") BASV very high temperature black aluminum voice coil support
  • 280°C CCAW flat wire voice coil (Copper Clad Aluminum Wire)
  • Double spider screwed to the frame for extreme reliability
  • 35mm front plate for an enormous magnetic gap
  • 35mm rear plate
  • Voice coil with dual cooling system
  • Spare recone kits available


  • 38cm 15" Subwoofer
  • Peak power: 10500W
  • RMS power: 3500W
  • Sensitivity: 92.0dB/2.83v/1m
  • Impedance: 2Ω (Single coil)
  • Coil diameter: 4 “
  • BL factor: 26.0
  • Response: 26Hz - 500Hz
  • Depth: 24.5cm
  • Weight: 38kg


  • Fs : 32 Hz
  • Mms : 383 grams
  • Re : 2 Ω
  • Cms : 0.06 mm/N
  • Z : 2 Ω
  • Bl : 26 N/A
  • Qms : 5.81
  • Sd : 800 cm2 (124.6 in2)
  • Qes : 0.44
  • Vd : liter
  • Qts : 0.41
  • Xmax mechanical : 47.5mm
  • Xmax : 15.0mm
  • Vas : 59.7 liters
  • SPL 2.83V/1m : 92.0 dB
  • Prms : 3500 Watts


MTX wants you to enjoy your hearing for a long time. Excessive exposure to loud volumes can damage your hearing. The United States Department of Labor recommends not exceeding the following recommendations:

  • 90db : maximum 8 hours / day
  • 92dB : maximum 6 hours / day
  • 95db : maximum 4 hours / day
  • 97db : maximum 3 hours / day
  • 100db : maximum 2 hours / day
  • 102db : maximum 90 minutes / day
  • 105db : maximum 60 minutes / day
  • 110db : maximum 30 minutes / day
  • 115db : maximum less than 15 minutes / day
  • 120db : immediate danger, 0 minutes / day

How to use the RFL15

Recommended amplifier: MTX RFL4001D


#1. One RFL4001D amplifier connects perfectly with one RFL15 subwoofer (2Ω)


#2. One RFL4001D amplifier connects perfectly with two RFL15 subwoofers (1Ω)


#3. For SPL competitions, it is possible to use two RFL4001D in bridge mode on one RFL15 (2Ω)

RFL15 recommended enclosure


  • Vented Enclosure
  • Fb = 34Hz
  • Wood thickness = 25mm
  • External dimensions = 65.1x48.0x44.0cm

  • External volume = 137.5 liters
  • Net internal volume = 100.3 liters
  • Load volume = 80.0 liters

  • Number of vent = 2
  • Vent diameter = 100mm aeroport
  • Vent depth = 32.6cm

  •  Frequency response, cone displacement

    Frequency response, cone displacement

  •  Vent(s) dimensions

    Vent(s) dimensions

  •  Box dimensions

    Box dimensions

RFL15 dimensions


RFL15 picture gallery

RFL15 downloads

On the Web Side...

Presentation RFL12 and RFL15 @CineNow

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