Kef IQ 9 - SP-3503 - Speaker set Where the new KEF iQ9 model differs is on the inside, and this is where the engineering excellence of KEF’s acoustic engineers has paid off. With over three decades of acoustic modelling, the expertise of KEF’s engineers has resulted in the redesign of the internal structure and re-voicing of both. Unlike the previous versions, which only used part of the cabinet volume, the new KEF iQ9 speakers are configured with the Uni-Q and bass drivers working together to take full advantage of the total cabinet volume. To complement this configuration the crossovers have been completely redesigned and upgraded. Uni-Q Technology Long throw bass driver Improved dynamics, greater bass agility and more precise timing. 3-way The speakers look very neat and work excellently. The speakers also have spike foot stands underneath, see photos For a better impression, see the photos.