The TDA2030 IC is a powerful audio amplifier IC able to deliver up to 20W of output power, so you can use it to run a 4Ω speaker at 12W or a 8Ω speaker at 8W.
The LM380 is a 2.5W power audio amplifier for consumer applications. In order to hold system costs to a minimum, the gain is internally fixed at 34 dB. The output of LM380 is short circuit proof with internal thermal limiting.
The LM4871 is a mono bridged audio power amplifier capable of delivering 3W of continuous average power into a 3Ω load with less than 10% THD when powered by a 5V power supply.