Megaphone, a big honkin' amplifier for your iPhone

In standard usage, the "€"symbol refers to Euros, not Pounds Sterling. Not sure about your neck of the woods.

People who say this don't know a **** about instruments, HiFi or anything that has to do with music! Music, or sound is just air that is vibrating in a certain frequency. So to generate sound you need a device that can set air in a vibrating motion. To generate louder sound you need a device that can generate even more air in an even more vibrating motion. This can be done in multiple ways. You can say about a guitar that its just a wooden box with snares. You can say about a sax that it's just a metal cone with holes in it. Or you can say about a speaker that it's just a plastic cone with an electric magnet placed in a wooden box. Fact is that in order to produce good sound big amplifiers or lots of electronics aren't really that important. Most High End music systems don't require large amplifiers at all! Most of the price you pay for those systems is in the research about what products to use and what form to put it in in what dimensions in order to produce the most accurate vibrations. They only way to judge those systems is to hear it in real life! Same goes here!

.027 stone, roughly.

The Euro is at least a currency used by a significant portion of the world, and is the "native" currency where this is being sold. Stones were legal measurement in Britain until the mid-80s, and are still used conversationally for human weight.