Right rack contains active crossovers, amp control with DC switching, HDMI switcher, Quad FM 4, Rotel A/V preamp, Marantz universal disc player, and world wide VCR. Next rack has dbx 157, DAT, Revox A700, eqalizers and DAC and work station case. Left rear speaker is shown. The rears are minimal ripple closed box design using Dynaudio drivers. All racks have UPS, with instant switch to battery in event of surge or power loss.