Simply The BestThe Casablanca IV remains the finest sounding, most flexible preamplifier / processor available today even 18 years after its initial appearance in 1996. Continuous upgrades have maintained our vision of a reference-worthy multi-channel audio processor with audiophile performance, come-hither cosmetics and world-class usability and maintained essential contemporary features. The 2012 revision to the III HD brought a new, Dave Reich designed power supply with HDMI and lossless audio decoding. Today's upgrade to the Casablanca IV brings 4k HDMI video pass-through, state-of-the-art audio bandwidth to 192 kHz, increases DSP processing power by a factor of 10, adds world-class digital room correction and optimization from Dirac Live operating at a world-leading 96 kHz and our novel Jitter Jail II to fix insidious timing errors especially inherent in HDMI audio signals. Only Theta Digital has offered such quality and long-term value in this ever-changing product category.Operational control is improved in the Casablanca IV. Not only can it be easily controlled by its front panel buttons, or via standard IR remote control, or, for the ultimate in system control, by its powerful RS-232 protocol which interfaces with complete home automation systems from companies such as Crestron, Savant and (soon) Control 4, remote operation is now possible from a new range of devices including iPad, iOS and Android devices.