The Marshall ML - 503 is an amazing, cost - effective solution featuring triple 5 - inch screens. It's ideal for fly - packs, control rooms, routing rooms, and various video system applications. What sets it apart is the looping video inputs, unlike single - SDI - connector competitors. With standard power and tally connections and a logical menu, it's a top choice for flexible system designs. **Triple Full HD Screens**: Three high - definition screens offer great color and stability. The adjustable backlight adapts to different viewing conditions. **On - Screen 3 Color Tallies**: Visible border tallies give instant feedback to the operator. **Great Off - Axis Performance**: A wide viewing angle allows flexible rack positioning. **Key Features**: - Three screens, high - quality picture at a great price. - Three 5 - inch diagonal screens with a wide aspect ratio. - Perfect for flypacks, control rooms, and news vans. - Front - panel controls access all functions. - Three - color on - screen tally lights (Red, Green, Yellow). - Multiple inputs with loop - through connections: 3GSDI (HDSDI, SDI), HDMI. - Safe area and center markers. - Two user - shortcut function buttons. - Tilting mount for optimal viewing and back - panel access. - Headphone jack for monitoring stereo audio. - Firmware update via USB port and thumb drive. **Technical Specifications**: - Number of Panels: 3 - Panel Size: Dual 5 - inch Diagonal, 2RU high - Resolution: 1920 x 1080 - Aspect Ratio: 16:9 - Viewing Angle: 170° / 170° (H/V) - Brightness: 460 cd/m2 - Contrast Ratio: 1100:1 - Compatible Input Formats: SDI/HDSI/3G SDI and HDMI support multiple formats. - Video Inputs: 3GSDI with non - reclocking loop - through & HDMI with loop - through per panel. - Audio Outputs: De - Embedded from SDI, HDMI x3 - Power Input: 12 Volts DC, less than 1.5 Amp typical, dual - type connectors. - Dimensions: 19” W x 3.5” H x 1.2” D (482.6mm W x 88.9mm H x 30.48mm D) - Weight: 5.2 lbs (2.32 Kg) - Rack Ears: Included, adjustable tilt

Using the Marshall ML - 503 is a breeze. First, connect the power supply using either the 5.5mm coaxial or 3 - pin XLR connector. Make sure the voltage is 12 Volts DC. Then, connect your video sources to the 3GSDI or HDMI inputs. You can use the loop - through feature to connect multiple devices. The front - panel controls let you access all functions, like adjusting the screen settings or checking the tally lights. When using it, keep in mind that the viewing angle is wide, so you can place the rack in different positions. But try to avoid direct sunlight on the screens to get the best picture. For maintenance, if you need to update the firmware, just plug in a thumb drive with the updated file into the USB port. Also, clean the screens gently with a soft, dry cloth. If you have any issues, check the power connection and input settings first. And don't forget to keep the rack well - ventilated to prevent overheating.