how many watts does he amp have in a 2005 chevy impala
A monster amplifier is about 500 watts, which means the amplifier is louder than most.
100 watts is great, 150 watts may be too loud for some, and there is higher watt amplifiers made.
It could be a 2 channel stereo amplifier.
The ideal size amplifier for a car is between 80 and 100 watts, otherwise if the consumer wanted more sound or more amps the amplifier must be larger watts capacity.
The ratings for the speakers will depend upon what '300 watts' means. If the amplifier develops 300 watts RMS total across 4 channels, this would indicate 75 watts RMS per channel. Speakers rated at 100 watts should suffice for this amplifier.
get the 2800
105 watts chann @ 8 ohm speakers
To figure that out you need to know the Amperage that it draws and what the voltage of the circuit is that you're using. Once you know that you can figure out how many watts it uses by doing simple math. Voltage x Amperage = Watts
The Alpine v12 MRV-F505 amplifier puts out up to 200 watts of RMS power at 4 Ohms and using 12 volts. At 14 volts, it puts out up to 400 watts of RMS power with a bridged 4 Ohms ratio.