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Video of PBG18:Rockville is proud to introduce the all new PBG18 18 professional subwoofer. Please do not compare this to any off brand name subs. This subwoofer is commercial grade. The advantages of purchasing Rockville Yamaha Peavey or other high end brands are longevity power sound quality and sensitivity. There is a huge difference between the quality and components of this versus off brand names.The off brand enclosures are built with a material called particle board. Better quality wood also equals better sound! The pro audio subwoofer in the cabinet has a very large 4″ KSV voice coil and a 100 oz. high quality magnet. The off brand names models will usually have a magnet half the size and a voice coil half the size as well. The advantage is that our unit can handle more power and will last longer. These subs can take a real beating! The reason was because it had a better sensitivity rating. This means that it was more sensitive to amplifier power. Another major factor that effects the sound is frequency response. The problem was it was not musical.