Overall, the quality of the product is inferior. White van speakers are often partially filled with concrete or rocks to increase their weight and create the illusion of high quality. Another common characteristic of white van speakers is an unusually high wattage rating for their size, for example 1000 watts for a 3-inch speaker, which in reality may be rated as low as five watts. In some cases when a buyer tries to hook up the home theatre system to a high definition television set, they find that it cannot be done, and the claim of HD compatibility made for the white van system is just another element of the scam. Systems (typically amplifiers with speakers, sold as sets) with only two or three inputs and a lack of video inputs, with only analogue L/R/6ch RCA jacks, are common in this scheme.