The QED speaker cable story began in 1973 with the launch of the worlds first specialist speaker cables QED 42 & 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 & 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.