Per Shunyata website - beyond that couldn't say
The QR/BB™ module possesses the ability to act as an electric charge reservoir, meaning it stores and releases energy in a manner that improves a component’s access to instantaneous current.
Dynamics are actually improved reducing any sense of dynamic strain often heard from amplifiers that are connected with lesser power cables.
The sonic result is a lifelike presentation of timing and dynamic contrasts in sound that cannot be replicated by ANY other means. In layman’s terms, it acts like a super-charger for amplifiers, pre-amps, DACs and CD players.