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  FV18 Direct Servo subwoofer
18" ported audiophile sub with 900WRMS amplifier
Performance & Specifications

FV18 has three port openings. With two (three) ports open, the max extension is 12hz (16hz). In the following is the frequency response when extension filter is set to 12hz and low damping for 2 port operation.

sealed response

Fig 1.0 - FV18 Frequency response chart with line-in 12hz low damping and two ports open

sealed response

Fig 1.1 - FV18 Frequency and phase response chart with line-in 12hz low damping and two ports open

Figure 1.1 has the phase response added. FV18 also has a rumble filter with -6db @10hz. This is suitable for playing opening scene in movie Edge of Tomorrow and 3 port operation to control cone excursion in the subsonic range. Fig 1.2 shows the frequency response of this rumble filter.

Fig 1.2 - FV18 Frequency response of the selectable rumble filter

To summarize, two port operation gives deeper extension and the recommended setting is 12hz low damping with optional rumble filter on. Three port operation gives more output and the recommended setting is 14hz mid damping with rumble filter ON.


One important aspect of getting a correct integration is phase alignment. We have written a guide on how to achieve a phase aligned subwoofer. More >


Driver DS1820 18" high excursion with custom sensing coil
Driver materials One piece black anodized dish aluminum with rubber surround
  Cast aluminum basket
  Multiple aluminum flux de-modulation shorting rings
Amplifier 900W RMS Hypex class-D patented servo controlled
Dimensions 21"(W) x 33" (H )x 22"(D) - (23" D with grille and heatsink)
Shipping Weight 180 lbs (160lbs gross)
Frequency Response 12 - 200 Hz (-4db@12hz) with LFE input
12 - 90 Hz (-4db@12hz) with LINE IN input
Multi-tune 16hz (3 port) and 12.5hz (2 port)
Crossover slope Selectable 12 or 24 dB / octave (PEQ)
Crossover range (Low pass) 25 - 100 Hz
Rumble Filter (High pass ) 12 Hz 18 dB / octave (-6db @10hz)
Phase adjustment 0 - 180 degrees continuously variable
Bass damping factor settings high (Q=0.5), med (Q=0.7), and low (Q=1.1)
Finishes Available in black matte paint or black oak vinyl
Warranty 5 years warranty on driver and 3years on electronics
  45 day home trial with customer paying one-way return shipping