Not opened or used. INAVI SW-10C thin type 10 Active Car Subwoofer in sealed aluminum enclosure. 800 Watts peak power output, 220 Watts RMS. With high speed MOSFET power supply, improved switching speeds, lower thermal impedance for higher switching frequencies. Amp Features: (1) Variable Low-Pass Filter, frequency 50Hz-250Hz; (2) Low-Level Inputs (RCA)- High Level Inputs, for options; (3) Variable Bass Boost & GAIN Input. Dimensions: 343mm260mm 82mm / 13.5″x10.2″x3.2 ; Unit Weight: 8 Lbs. The combination of amplifier and subwoofer all into one, make it is easy to be installed under the passenger’s seat. Complete Wiring Kit & high to low level inputs adapter in the package, make the installation more easy.