Introduction
The StarTech.com SV431DHD4KU is a 4-port Dual Monitor HDMI KVM Switch designed to control four HDMI-enabled computers from a single console (keyboard, mouse, and two monitors). This device supports resolutions up to 4K 30Hz and includes a built-in 2-port USB 3.0 hub for sharing peripherals, as well as 3.5mm audio ports for independent audio control.
Package Contents
- 1x SV431DHD4KU 4-Port Dual Monitor HDMI KVM Switch
- 1x Quick-Start Guide
- 4x Rubber Feet
- 1x Universal Power Adapter (NA/JP, UK, EU, ANZ)

Product Diagram
Front Panel

- HID USB Port: Connect your keyboard or mouse.
- USB 3.0 Port: Connect USB 3.0 peripherals.
- Computer Selection Buttons (1-4): Press to switch to the corresponding computer.
- Power Indicator: Illuminates when the KVM switch is powered on.
Rear Panel

- DC 9-12V Power Input: Connect the included power adapter.
- Console Ports:
- 2x USB HID Ports (Keyboard/Mouse)
- 2x USB 3.0 Ports
- 2x 3.5mm Audio Out (Speakers)
- 2x 3.5mm Audio In (Microphone)
- PC Input Ports (PC1-PC4): Each computer requires:
- 2x HDMI Input Ports
- 1x USB 3.0 Input Port
- 1x 3.5mm Audio Out (from PC)
- 1x 3.5mm Audio In (to PC)
Setup and Installation
Follow these steps to connect your KVM switch and computers:
- Power Off All Devices: Ensure all computers, monitors, and the KVM switch are powered off and unplugged.
- Connect Console Devices: Connect your keyboard and mouse to the HID USB ports on the KVM's console side. Connect your two HDMI monitors to the console HDMI output ports. Connect your speakers and microphone to the 3.5mm audio ports on the console side.
- Connect Computers: For each computer (PC1 to PC4):
- Connect two HDMI cables from the computer's video output to the corresponding HDMI input ports on the KVM switch (e.g., PC1 HDMI 1 and PC1 HDMI 2).
- Connect a USB 3.0 cable from the computer's USB port to the corresponding USB 3.0 input port on the KVM switch (e.g., PC1 USB 3.0).
- Connect 3.5mm audio cables from the computer's audio output and input to the corresponding audio ports on the KVM switch (e.g., PC1 Audio Out and PC1 Audio In).
- Connect Power: Plug the universal power adapter into the DC 9-12V input on the KVM switch, then plug the adapter into a power outlet.
- Power On: Power on the KVM switch, then power on your monitors, and finally power on your connected computers.

Operation
Switching Computers
You can switch between connected computers using the front panel buttons or keyboard hotkeys.
- Front Panel Buttons: Press the corresponding numbered button (1-4) on the front panel of the KVM switch to select the desired computer.
- Keyboard Hotkeys: Use specific key combinations on your connected keyboard to switch between computers. Refer to the Quick-Start Guide for the exact hotkey sequences.
USB 3.0 Hub Functionality
The KVM switch features a 2-port USB 3.0 hub on the console side. Any devices connected to these ports will automatically switch to the currently selected computer, allowing for shared access to peripherals like external hard drives, webcams, or printers.
Audio Sharing
The 3.5mm audio ports provide independent analog audio switching. Your speakers and microphone connected to the console will switch along with the selected computer, providing full multimedia control.
Specifications
| Feature | Specification |
|---|---|
| Model | SV431DHD4KU |
| Brand | StarTech.com |
| Number of Ports | 4 |
| Video Interface | HDMI (Dual Monitor) |
| Maximum Resolution | 4K 30Hz |
| USB Hub | 2-Port USB 3.0 |
| Audio | 3.5mm Stereo Audio (In/Out) |
| Control Method | Push Button, Hotkeys |
| Material | Steel |
| Dimensions (L x W x H) | 8.7 x 5.1 x 2.5 inches (22.1 x 13.0 x 6.4 cm) |
| Item Weight | 2.73 lbs (1.24 kg) |
| Power Adapter | DC 9-12V, 1.5A (18W) |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
Troubleshooting
- No Video Output:
- Ensure all HDMI cables are securely connected between the computers, KVM, and monitors.
- Verify that the KVM switch is powered on and the correct computer port is selected.
- Check monitor input settings to ensure they are set to the correct HDMI input.
- Try using different HDMI cables or connecting monitors directly to a computer to rule out cable or monitor issues.
- Keyboard/Mouse Not Responding:
- Ensure the keyboard and mouse are connected to the dedicated HID USB ports on the KVM console.
- Verify that the USB cables from the computers to the KVM are securely connected.
- Some advanced keyboards/mice may require connection to the USB 3.0 hub ports instead of HID ports for full functionality.
- Restart the KVM switch and computers.
- Audio Issues:
- Check all 3.5mm audio cable connections.
- Ensure audio output/input settings on the selected computer are configured correctly.
- Verify speaker and microphone connections and functionality.
- USB 3.0 Devices Not Detected:
- Ensure the USB 3.0 cables from the computers to the KVM are connected.
- Some high-power USB 3.0 devices may require an external power source.
Maintenance
To ensure the longevity and optimal performance of your KVM switch:
- Keep the device in a cool, dry environment, away from direct sunlight and heat sources.
- Clean the exterior with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
- Ensure proper ventilation around the unit to prevent overheating.
Warranty and Support
This StarTech.com SV431DHD4KU KVM Switch is backed by a 2-Year Warranty.
For technical support, product information, or to access drivers and manuals, please visit the official StarTech.com website or contact their customer support directly.
Product Overview Video
Watch this video for a visual overview of the StarTech.com 4-Port Dual Monitor HDMI KVM Switch, highlighting its features and benefits.