The unique balanced topology reduces stray capacitance in the magnetic circuit, among other things, with the result of dramatically improved clarity. There are three separate internal chambers: a larger one in the center which contains two 5-1/4˝ drivers which run up to meet the tweeter and are coupled to the larger, 7˝ x 10˝ passive radiator in the center, and two smaller ones which each contain a special 5-1/4˝ driver engineered for low frequency response, which runs up to 500 Hz, and is coupled to one of the smaller, 6-3/4˝ x 8˝ passives.
QED Subwoofer 40 has been designed primarily for low capacitance, as this has been identified by QED as a major factor making for a tight sound which retains the rhythm of the original piece - vital when it comes to the 'bottom end!" Minute timing errors are ameliorated by the use of QED's Complementary Conductor TechnologyTM combined with a special floating Zn/Mn ferrite jacket to absorb very high frequency noise signals outside the audible band. The QED AnalocTM plug design helps to control eddy currents which can also affect the micro-timing of the audio signal, maintaining high- fidelity from start to finish.