how This is an epic story about bass, sonic booms and a pair of legs in the back. It's the 80s, massive foam, ridiculous workout videos, thatcher, Reagan, while punch walk around with no-walks and group of legendary details are underground starting a house revolution. These are the 80s for all about bass, tasty, smooth, delicious bass. And while downstairs it's dance, dance, dance, upstairs it's money, money, money. Things need to be shiny, big and fast, so fast that some genius has already come up with the first supersonic passenger jet, Concord. It can get you from London to New York in 3 hours travelling over 2,400 kilometres per hour. They call it Mac 2 speed, twice the speed of sound. That means you're arriving before you even left, crazy. And if you want to ride you have to be insanely rich or insanely famous. One problem, it's loud. Very loud. This is travelling faster than the speed of sound creates sonic booms, which shock waves that sound like an explosion to the human ear, the solution, headphones. Now Concord call up Senaiser who developed their H225s, built to beat the sonic group, and obviously they know it. Warning, this is where our story gets a bit naughty. You see these headphones are so good that everyone starts stealing them. Airhosts, there's his pilots, even the multi-millionaire businessmen are sneaking them off. Now there's booth like H225s being smuggled across Europe and America. And after passing through the wrong hands, they land on their heads with a few risk-taking DJs. Boom, dance moves, it takes over the world, and the H225s take over the booths. I never leave. In your headphones are not all the same. They have two different driver principles, and what I put in my ears makes a difference. Can we hear each other? Can I hear me? Can I feel the beat? In ears answer those questions. Most in ears are based on a technology that still come from hearing aids. The focus was less on a big sound and more on a small design. The other option is dynamic drivers. They are clearer, more precise and more natural. Up until now they weren't small enough, but the game has changed. New wide band-strands uses immediately deliver a natural warm sound in one go. Balanced armatures don't have a big range and have to split up the frequency response. That leads to a whole different set of problems. And compared with the conventional Balanced armature systems, the dynamic wide band-strands dooses have a much wider frequency range. At max volume levels is the rather rigid-balanced armature design which tends to distort more quickly. That's the advantage of the new wide band-strands dooses. They are much clearer and more precise. This new system delivers a transient response that you can feel. All of these advantages have now been perfected to fit in a very small space, improving the way we perform by enhancing the way we hear. You are asking what it sounds like? Like me. Just more me. You're still on the line. It's all as it's near tonight. Come on, let's get closer.