Advanced Yst series of Yamaha contains nine models of subwoofers, among which SW205 takes the middle position. YST abbreviation (Yamaha Servo Technology) means the use of feedback system in the amplifier, radically increasing the damping factor. YST is its modified variant, allowing to factor nonlinearity of load (dependence of the resistance of LF-head on frequency) The sub's body is made of MDF. The shielded head and bass reflex port are closed by fixed grill. 

The full set of terminals doesn't have only linear outputs, standby mode switch, Movie/Music switches, band controls and phase inverter are on the faceplate.  There are a protection relay of the output and power from current auto operation: being in standby mode, the sub will work either at high or low input signal. Auto power off is in 8 minutes of silence.

SW208 is a powerful subwoofer, easily generating a distinct volume of low-frequency information from a recording, Volume control position "in the 12 o'clock" in our case turned out to be sufficient. Dynamical, rich action movies and movies-disasters with good degree of scaring realism. YST-SW205 is a great theatical subwoofer with dynamically rich bass and good power reserve. Its abilities are enough for full sounding of even quite large rooms, but it will be better to leave some energy as a reserve.

N/B: Similar subwoofer ranges from $210.00 and up.  You have a great deal.  The white stuff on the cover could easily be washed off.  It does not look as bad as it looks in the picture.