A few tips to help you out for selecting proper speakers are:1. Always select from reliable brands like Sony, Pioneer, JVC, Kenwood etc. as these companies offer got warranty support and best speakers that are long lasting. 2. Always take original speakers with warranty cards and bills as these original speakers have different types of small speakers in it that play different sound nodes beautifully. 3. Power output is used to define how much power a speaker can handle, and power handling is measured according to RMS ratings. The higher the RMS rating, the greater the power the speaker can handle on a continuous basis. So always try to buy speakers with high RMS if you want to buy heavy speakers.