The QED speaker cable story began in 1973 with the launch of the worlds first specialist speaker cables QED 42 and 79 strand now household names in the audio industry. Building on this longstanding British speaker cable heritage QED embarked on an exhaustive research program into cable parameters which began in 1995 and continues into 2017 with the release of \"The Sound of Science\" a 40 page White Paper distilling the research published since 1973 by QED. These reports set out the \"top down\" design-principles that have resulted most recently in the development of QED XT25 loudspeaker cable – the new class leading standard in budget to mid-range speaker cables.