The D’Appolito arrangement in the mid-range of the PLATINUM + seven and PLATINUM + nine ensure maximum dynamics and a low crossover frequency with gentle filters for an optimized phase response. Quality as standard : In all PLATINUM + models there are sturdy adjustable spike feet with removable silicone protection for scratch-sensitive floors as standard . The equipment also includes chrome-plated high-end terminals with high-quality screw terminals and switches for high-frequency adjustment.