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F18+ Subwoofer – AXPONA 2018 Demonstration Unit


The F18 is a highly flexible, modular subwoofer solution where each F18+ unit with its 4,000W amplifier can power itself, as well as 1, 2, or 3 additional F18-Slave units.  In-room extension to below 10Hz is possible in the largest to the smallest of spaces.  Slave units can be placed separately from the F18+ unit such as an F18+ in the left front corner, and a connected F18-Slave unit in the front right corner.

SKU: F18PA-1 Categories: ,


F18 Details and Specifications:

Amplifier & Controls (F18+):

  • 4000W continuous power amplifier (with slave connected)
    • 1400W continuous power as a single unit
    • Capable of driving our passive F18-Slave to the same levels as a single F18+
    • 4 Conductor Neutrik SpeakON connection for powering optional slave unit
    • US designed, high current, high duty cycle, class D amplifier design
    • High efficency of up to 95% for maximum power from available home circuitry
    • Fully Manufactured in the USA (board level up)
    • Nominal 120V operation (HP i+/F2i+ version available for 208-240V operation)
    • IEC Power Cord (10′ length included) – right angle plug available
  • Connection options
    • 12V trigger and auto sensing – 3.5mm mini-cable connection
    • LED indicator for power, standby or error codes.
    • XLR -Female input (LFE/mono) with looping, XLR – Male output (internal Y connection)
    • 2 summed RCA inputs for LFE or Stereo inputs
  • Digitally programmable, detented, control knobs for precision adjustment and tuning
    • GAIN (volume) control – wide range for matching any system
    • LF Adjust (low shelf/adjust extension/room sizing) enabling adjustment of low frequency extension from 12Hz to 27Hz or +/- 8dB shelf (see graphs).
    • Low pass crossover 30-120Hz + 200Hz, precise, digital, Linkwitz-Riley 4th Order fitlers (24dB/oct)
    • Delay adjustment – 0-20ms for multiple subwoofer blending
  • Proprietary DSP performance optimization
    • Smooth anechoic/outdoor frequency response
    • Carefully optimized, proprietary overload protection – never fear for the well being of your subwoofer while the F18 maintains composure to much more intense playback levels
    • Smooth power response to 200Hz for seamless crossover and articulation with compact speakers
    • Shallow sealed roll off maintained in all LF Adjust settings
    • Shallow low frequency roll off typically yields 7-10Hz in-room extension
    • LF Adjust shelving & room size adjustment allow for a best fit with large to small rooms or adjusting to personal preference after room correction.

Drivers & Design:

  • 18″ sealed subwoofer
  • High excursion 18″ driver with 3” Voice Coil
  • Durable and strong inverted dish cone consisting of 2 layers woven fiberglass sandwiching a Nomex honeycomb
  • Cast 12 spoke basket with large under spider venting
  • Extended pole with dual aluminum shorting rings for low distortion at all power levels
  • Under spider venting and large pole vent for low operational noise and thermal cooling


  • Common enclosure to ensure matching in driver output
  • Locally produced with custom-tooled lock mitered construction
    • Pre-veneered shell cut by high precision CNC router
    • Pre-veneered sheet is machined pressed for superior veneer adhesion
    • Lock mitered joints insure perfect alignment, increased joint strength, and sharp veneer edges.
    • Matte black, decoupled 1.25” beveled face for woofer protection, baffle damping, and aesthetic appeal
    • Interlocking braces enhance strength and precision of the enclosure while controlling panel vibrations
    • Removable feet with counter-bored, M6 hardware allows for optional spikes or a flat bottom for stacking
    • Selection of available wood species and stain options
  • Magnetically secured grills with no pegs to break or see when the grills are off
  • Dimensions 24.25″ H x 23.5″ W x 18″ D (including feet and magnetically attached grill)
  • Dimension Drawing (link to PDF)
  • Weight: 115 lbs (F18+)
  • Shipping Dimensions: 28″ W x 22″ D x 30″ H, 128 lbs


Acoustic Details:

  • Internal 4000W/1400W amplification (with slave/indiviually)
  • Anechoic response:
    • +/-3dB from 18Hz to 200Hz outdoor response (LF Adjust @ 12 o’clock)
    • +/-3dB from 12Hz to 200Hz outdoor response (LF Adjust @ full clockwise)
    • +/-3dB from 27Hz to 200Hz outdoor response (LF Adjust @ full counter-clockwise)
  • 24dB/Octave CROSSOVER selectable from 30-120Hz and Bypass
  • 0-20ms DELAY adjustment for blending front/rear subwoofer sets
  • Typical in-room extension to 7-12Hz

Additional information

Weight 128 lbs
Dimensions 28 x 22 x 30 in
F18+(powered) or F18-Slave

F18+ with 4000W internal amplifier, F18-Slave

Cabinet Veneer

Black Maple, Black Oak, Rosenut, Espresso Cherry, Vintage Cherry, Golden Cherry, Clear Maple


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