F18

About the F18

The Rythmik F-18 is the largest single-driver sealed subwoofer from Rythmik Audio, designed to deliver high power and deep, accurate bass for home theater and music systems. It features an 18-inch DS1820 driver with an anodized aluminum cone, 3" voice coil, and a 240 oz magnet, capable of +/- 20mm linear excursion. The subwoofer uses patented Direct Servo technology, which provides precise cone control, reduces distortion, and improves transient response by counteracting driver non-linearities. The amplifier is a 900W RMS Hypex class-D servo-controlled module, ensuring low distortion and high efficiency. The sealed enclosure is built with 1" thick walls and substantial bracing to minimize resonance. Frequency response ranges from 14 Hz to 200 Hz (-2 dB) with LFE inputs, and the subwoofer offers selectable crossover slopes (12 or 24 dB/octave) and adjustable phase control. It includes a rumble filter at 20 Hz and parametric equalization for room mode correction. The F-18 is praised for its ability to deliver crushing lows without strain, excellent integration with main speakers, and musicality, making it suitable for both music lovers and home theater enthusiasts. Dimensions are approximately 20.5" W x 20.5" H x 21" D (23" D with grille and heatsink), and it weighs about 115 lbs net (133 lbs shipping weight).