Keep Your HDMI Signal Up To Speed Maintain the integrity of your home theater set-up with genuine Audioquest cable adapters. Audioquest's HDMI Extender extends the usable HDMI cable length for maximum digital audio/video performance. Transmitting high-speed HDMI signals over long distances isn't easy because of the high-frequency nature of the signal. Without the use of an HDMI extender, the HDMI signal becomes distorted. This results in jaggies, drop-out—a poor quality picture in general. Using an HDMI extender will amend any signal distortion before it reaches your display.