Often times when working with either kit radios or home brew, they have been designed with headphone use in mind and often you want to plug in a speaker and just have the noise going in the background and when that happens, you need to have a powered speaker. So I had some speakers left over from a home theater system that had bit the dust, so I have purposed one into a powered speaker.
For the amplifier I used a 2w Class D power amp. I really like these power amp modules, they put out good power, are very power efficient and they are tiny 3cm x 2cm. So thats another project done and off the bench.