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Decibel is a mobile speaker and the first of a new generation of technology products. it comes with 2 powerful 2 inch bass drivers. It can be easily upgrade

"Teaching about sound in the classroom used to involve lots of fiddly bits of kit such as Signal Generators and Decibel Meters that would cost a lot of money and only get wheeled out once a year. Thankfully if you have an iPhone or iPad you can replace quite a bit of that kit with a couple of handy apps which are either free or relatively inexpensive. Here's a couple to get you started:"