Fluid Audio F8S, Active Subwoofer, Equipped with: 8""- Composite paper membrane speaker with high temperature coil and rubber damper ring, 200 W Class-D power amplifier, Frequency range: 30 - 200 Hz, Volume control on front side, Bass reflex port on front side, Balanced XLR and unbalanced 1/4"" jack and RCA inputs, Balanced XLR and unbalanced 1/4"" jack outputs, Adjustable low-pass filter: 50 Hz - 200 Hz, Optionally ""Flat"" or ""Punch"" setting, Noise ratio: 100 dB (typical, A-weighted), Polarity: Positive signal at the + input causes the subwoofer diaphragm to move forward, Input impedance: 20 kOhm balanced, 10 kOhm unbalanced, Input sensitivity: 85 mV pink noise input generates 97 dBA SPL at the output at 1 m distance and volume control at maximum, Amplifier standby function, Phase controller, Housing: Vinyl-coated MDF, Bypass footswitch to turn the F8S on and off, Power supply: 220-240 V ~ 50 Hz, Protection circuits: RF interference, Output voltage limitation, Overheating, transient, and subsonic protection, External main fuse, Dimensions: 340 x 254 x 270 mm, Weight: 7.9 kg