A couple of years ago I made two amplifiers for my sons. Simple projects but I still love the wooden enclosures that I made. Now my youngest son wants me to add bluetooth and a battery which is a nice challenge to improve the simple designs. So last night I opened his enclosure to take a look at the components. The amplifier is a Sure Electronics AA-AB32131 while the speakers are Visatons FRS-8. Any suggestions for a replacement amplifier with integrated bluetooth?