Question: The adapter video is excellent on my 4K display, but the audio is dropping?
Answer: Please check different sample rates/bits by click "Properties"->"Advanced" of the Playback Devices of Sound (Control Panel->All Control Panel Items->Sound)?

Feature Bullets
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The active adapter connects a DisplayPort equipped Laptop or Desktop to an HDTV, projector, or display with HDMI input and supports up to 4K resolution.
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Built with Parade PS171 chipset that enables active protocol conversion from DisplayPort to HDMI and ensures AMD Eyefinity compatible.
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Support resolutions up to 4K Ultra HD (or UHD) 3840x2160@30Hz (2160p) resolution, full HD 1080p HDTV, and 1080p stereoscopic 3D.
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Plug & Play without software driver installation. Low power consumption No external power adapter required.
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Built with high quality cable and over molded strain relief design to ensure superior flex life, tensile strength, and moisture protection.
Product Description
The Ableconn DPHD4K0AA is a high quality active adapter which provides an easy and cost-effective solution for connecting an HDMI display such as monitor, projector, or HDTV to your DisplayPort equipped computers. It supports displays of up to 3840x2160@30 Hz HDTV or 4096x2160@24 Hz PC graphics and is ideal for your office, home entertainment display, conference rooms, and more.
Specifications
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Input: DisplayPort male
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Output: HDMI Type-A female
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Built with Parade PS171 chipset.
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Active converter, AMD Eyefinity compatible.
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Audio: 7.1 Surround Sound
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DisplayPort 1.2 and HDMI 1.4 compliant up to 3.0Gbps (300MHz TMDS Clock)
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Support resolutions up to 4K UHD 3840 x 2160@30Hz 24 bit color and Stereoscopic 3D 1080p@120Hz
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Supported Resolutions:
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PC: 800x600, 1024x768, 1280x768, 1280x800, 1280x960, 1280x1024, 1360x768, 1360x1024, 1366x768, 1440x900, 1600x900, 1600x1200, 1680x1050, 1920x1080, 1920x1200, 2048x1152, 2048x1536, 2048x2160, 2560x1080, 2560x1440, 2560x1600, 3840x2160@30Hz , 4096x2160@24Hz
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HDTV: 480i, 576i, 480p, 576p, 1080i, 1080p, 2160p@30Hz
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Certification: FCC, CE
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Can only convert signal from DisplayPort to HDMI. This is not a bi-directional adapter.
Package Contents
Ableconn Active DisplayPort to HDMI Adapter
Warranty
Limited One-Year Warranty and Lifetime Product Support