Founded more than 70 years ago JBL has been a magnet for audiophiles of every generation. Over months, JBL acousticians, mechanical experts and software engineers have modified and optimized all audio elements of Cardo's intercom systems to deliver a whole new 45mm set of the best sound ever in a motorcycle communication system. Achieving good audio quality inside a motorcycle helmet is demanding. The wind, the road, the engine and the type of helmet, all affect the frequencies you hear. With that in mind, these 45mm speakers combine the sound only a large diameter driver can provide, with a narrow, 42mm base that can fit almost every modern helmet. With a standard 3.5mm jack, these speakers fit practically any communicator on the market, no matter what brand. Owners of Cardo Freecom and Packtalk series will enjoy extra boost with new JBL sound processor and firmware. Not a Freecom or Packtalk owner" No worries: this powerful hardware will still drive your headset audio performance to new heights.