The SoundUp battery-powered Bluetooth amp is launching on Kickstarter100W of mono class D amplification, and two can work in a pair40 hours of playback on battery, 1kg (2.2 lbs) weightWhat's more convenient than taking one of the best Bluetooth speakers to the beach? But the SoundUp portable amp is a clever little thing, albeit one with a very specific niche. It's designed to take passive stereo speakers, power them and add Bluetooth streaming to them, and all without requiring a power socket. (Image credit: LastObject)SoundUp portable Bluetooth amp: key featuresThe SoundUp is a more modest device than Bluesound's one, so you don't get features such as Apple AirPlay. And that's absolutely true: there are some really lovely speakers going for a song on places such as Facebook Marketplace.