Executive HD 4 & 8 Channel All support information for the Executive HD series. Firmware & Software Download HD Firmware Download HD Control Panel Software Documents Executive HD Installation and Operation Guide, English Executive HD Installation and Operation Guide, Chinese Executive HD Installation and Operation Guide, French Executive HD Installation and Operation Guide, German Executive HD Installation and Operation Guide, Italian Executive HD Installation and Operation Guide, Japanese Executive HD Installation and Operation Guide, Spanish Executive HD Front and Back Diagrams Executive HD 4 Channel Spec Sheet Executive HD 8 Channel Spec Sheet HD Microphones Spec Sheet HD Executive CAD Drawing Hybrid Microphone User Guide Setup Guides Tandberg C60-C90 Setup Guide