To answer the original question.. I don't think there is a problem. There is very little reason to worry about matching the amplifier output to subwoofer rating. The subwoofer rating is usually thermal. Some subwoofers allow more mechanical excursion than what's suggested by thermal rating, others less. Also, just because you connect a 500watt RMS amplifier, it's not like it will be used to send a 0dB bass test tone at full tilt all day long. Realize that most of the time, your subwoofer will be seeing less than 100watts, and if the musical peak results in 500watts being sent to the subwoofer for a short while, that's nothing to worry about. Musical input is not the same as RMS sine wave.
Also realize that most amplifiers are rated with 14.4volt battery, unless stated otherwise. If you want to know how much RMS wattage your subwoofers will see using the voltage usually seen in a car, subtract about a quarter. So your typical amplifier that's rated for 500watts, probably will never send more than 400watts RMS in a car/SUV.
Also realize that most amplifiers are rated with 14.4volt battery, unless stated otherwise. If you want to know how much RMS wattage your subwoofers will see using the voltage usually seen in a car, subtract about a quarter. So your typical amplifier that's rated for 500watts, probably will never send more than 400watts RMS in a car/SUV.
