After my Yamaha YST Advanced YST and QD 030 SW Bass Subwoofer 130 W, 20 cm woofers of my son experienced a permanent loan locomotion, a new was needed. However, since this is not currently available at Amazon, I decided, not least because of various reviews and detailed Internet search for it here and did not regret it. But exactly what I expected me Super processed low, nice and solid and faithful sound (softer). The gain power can be adjusted continuously to the rear. What bothers me personally something is the fact that the protective cover of the speaker is not removable, but is complaining on a high level .... The speaker is at all what it takes for small Gummiplätchen not stick to the bottom so that it " migrates "when things get loud, and although a thin but long enough Chinchkabel ((I think 3 meters) mine was already laid so I needed this not ...)) for connection to the amplifier. To 86 Euro, he was my absolute value to buy it, although it can take in terms of performance it does not quite with his predecessor YST SW 030. Sonically, however, he is equal. Full buy recommendation!