Overview

The 718KVM Encoder — and its 3-in-1 rackmount counterpart, the 749KVM — includes the following features as standard:

• 4K video with HDCP 2.2 support
• Stereo audio support
• 3.5mm stereo analog audio output with adjustable delay
• KVM support for USB 2.0
• RS232, CEC, and IR control

The DSP-KIT is an optional, field-installable upgrade that adds advanced audio processing and mixing capabilities:

• Dolby Digital 5.1 audio support
• Dolby DSP re-encoding (Dolby Digital 5.1 → stereo via Dolby Pro Logic II), allowing HDMI distribution to both multi-channel and stereo zones. See this article for details.
• 3.5mm stereo analog output with adjustable delay and volume
• Two analog audio inputs that can be mixed with HDMI audio

718KVM vs. 718AVP

The simplest way to understand the relationship between these models is:

718KVM + DSP-KIT = 718AVP

749KVM + (3 × DSP-KIT) = 749AVP

Installing a DSP-KIT upgrades a 718KVM (or 749KVM) to full AVP-level functionality, adding Dolby Digital audio processing and advanced audio mixing features.

Installing the DSP-KIT

Only a Phillips-head screwdriver is required. Follow the steps below:

1. Remove the four screws from the sides of the 718KVM case.

   

2. Remove the locking nuts from the 3.5mm Mic-In and Line-In ports on the front of the unit.

   

3. Locate the empty socket area on the circuit board where the DSP-KIT installs.

   

4. Align the DSP-KIT board with the pins and press down evenly from all four corners. Ensure all three pin groups are aligned before applying pressure.

   

5. Reassemble the case, reinstall the screws, and replace the locking nuts.

Confirming DSP-KIT Installation

The 718KVM front panel includes a green Dolby Digital LED. Its behavior indicates whether the DSP-KIT is installed and active:

• Without DSP-KIT installed: The LED blinks slowly and steadily, regardless of the incoming audio format.
• With DSP-KIT installed:
  • Solid on when receiving Dolby Digital 5.1 audio
  • Off when receiving stereo audio or no audio signal