RCF LF18X400 18" Replacement Woofer
Product #50517 | SKU 11185002
Availability on Request
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RCF LF18X400 18" Replacement Woofer

Product #50517 | SKU 11185002
Availability on Request

Features RCF Precision’s spaced gap demodulation technology
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Product Details
  • Product: #50517
  • SKU: 11185002
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Incredibly linear frequency response characteristics, extreme high power handling while generating the lowest harmonic distortion of any comparable 18-inch transducer within its application range.

The LF18X400 uses a fibre loaded cone assembly along with a high excursion triple roll, constant geometry surround. A fully optimised T-pole design generate the minimum amount of flux modulation. The T-pole also features RCF Precision’s spaced gap demodulation technology, progressively braking the voice coil, providing a much smoother transition for the moving mass as it reaches its maximum excursion limits. Forced air venting system


  • 4-inch, fiberglass inside/outside copper voice coil
  • 2000W continuous program power handling
  • 5 dB Sensitivity
  • 25 Hz – 1 kHz Frequency range
  • Progressive, spaced, aluminum demodulation rings
  • Forced air ventilation and 14 mm top plate for minimum power compression
  • Dual spider design with silicon based dampening control
  • Triple roll surround and corrugated straight cone geometry


  • The LF18X400 is ideal for use in applications where incredible power handling,long excursion and perfect control is required.
  • Ideal for high quality professional bass reflex and bass-horn system.
  • The transducer's low frequency extension, coupled with its extremely low generation of harmonic distortion,also makes it ideal for use within critical listening applications such as studio monitoring subwoofer system.


General Specifications
Nominal Diameter 460 / 18 mm/inch
Rated Impedance 8 O
Program Power 2000 W AES
Power handling capacity 1000 W AES
Sensitivity 97.5 dB
Frequency Range 25 Hz ÷ 1000 Hz
Effective Piston Diameter 395 / 15.6 mm/inch
Max Excursion Before Damage (peak to peak) 50 / 2.0 mm/inch
Minimum Impedance 6.0 O
Voice Coil Diameter 100 / 4 mm/inch
Voice Coil Material Copper
Voice Coil Winding Depth 25 / 1.0 mm/inch
Number of layers 2
Kind of layer inside / outside
Top Plate Thickness 14/0.55 mm/inch
Cone Material No pressed pulp
Cone Design Straight
Surround Material Polycotton
Surround Design Triple roll
Thiele/Small Parameters
Resonance frequency 28 Hz
DC resistance 5.1O
Mechanical factor 6.5
Electrical factor 0.29
Total factor 0.27
BL Factor 25 T · m
Effective Moving Mass 192 g
Equivalent Cas air load 340 liters
Effettive piston area 0.122 m²
Max. linear excursion (mathematical) 9.0 mm
Voice - coil inductance @ 1kHz 2.3 mH
Half-space efficiency 2.64%
Mounting Information
Overall Diameter 465 / 18.3 mm/inch
Bolt Circle Diameter 442-447 / 17.4-17.6 mm/inch
Bolt Hole Diameter 6.5 / 0.25 mm/inch
Front Mount Baffle Cut-out 424 / 16.7 mm/inch
Rear Mount Baffle Cut-out 424 / 16.7 mm/inch
Depth 210/8.3 mm/inch
Volume occupied by the driver 7.0/0.25 liters/ft³
Net Weight 13.3 / 29.3 kg/lbs

Australian Shipping Via DHL
DHL offers a great express shipping service to Australia from New Zealand. We are proud to be able to offer express shipping to main cities on the east coast of Australia, within the same timeframe ( If not quicker ) than local Australian courier companies. Prior to the Covid-19 outbreak, service standards for these main centers was overnight. However these services have been impacted greatly, and as such the overnight service has been suspended. Overnight shipping will likely resume once things have returned to normal.

Qualifying main centers include:

  • Brisbane
  • Sydney
  • Adelaide

Whilst this service is extremely efficient and will likely be delivered within 1-2 days 99.9% of the time, it cannot be guaranteed. In the case where something were to go wrong with your delivery and it doesn’t arrive within the specified time frame, in most cases it will be delivered by the next day.

While not all major cities are eligible for overnight delivery, they still benefit from this great service. Other centers throughout Australia will have a typical delivery ETA of 2-4 days. (Excluding rural delivery address where this ETA can be extended to an additional three or more days).

If you require urgent shipping and you don’t reside in one of the cities stated above, please contact us and we can find a solution that works best for you.

Please Note: Shipping via DHL is not available to PO boxes and/ or parcel boxes etc.


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  • Product: RCF LF18X400 18" Replacement Woofer
  • Manufacturer: RCF
  • Model: 11185002
  • SKU: 11185002
  • RM Product #: 50517