The science of sound 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 45 mm set of the best sound ever in a motorcycle communication system.
The best fit 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 45 mm speakers combine the sound only a large diameter driver can provide, with a narrow, 42 mm base that can fit almost every modern helmet.