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    • Home  / Product Manuals & Documentation
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    Pulse-Eight P8-HDMIDAC — Dolby Digital Down-Mixer & 4K/HD Scaler Technical Specification

    September 08, 2026 3 min read

    Technical specification for the Pulse-Eight P8-HDMIDAC Dolby Digital down-mixer with UHD 4K downscale and HD upscale.

    💾 Download Original PDF
    Full text manual (for reference)

    Technical specification sheet for the Pulse-Eight P8-HDMIDAC — a Dolby Digital down-mixer with UHD 4K downscale and HD upscale, designed to bridge 4K and 1080p HD displays within the same distribution system.

    Overview

    Although 4K UltraHD has arrived, not every client will replace their existing HD screens overnight, so supporting a combination of 4K and 1080p HD displays within the same distribution system is essential — especially given resolution conflicts across screens with different capabilities. The P8-HDMIDAC video scaler and digital audio converter (DAC) is designed to sit between a display and a source device. It adjusts resolution and audio from an incoming HDMI source and scales the output to a level compatible with the display's capabilities, making it the ideal solution for accommodating both HD and 4K sources and displays within a multi-zone residential or commercial system.

    Key Features

    • In-line downmix of incoming Dolby Digital to stereo PCM audio over HDMI
    • 3.5mm audio breakout
    • Downscale 4K/30p to 1080/24p, letting 1080p screens view 4K sources through a 4K matrix system
    • Upscale 1080/24p to 4K/30p, for connection to 4K screens

    Additional Features

    • In-line scaling solution for installations using both 4K and HD displays without compromising source resolution
    • Supports resolutions up to 3840x2160p @24/25/30Hz
    • Full 3D support up to 1080p/24Hz
    • Up to 6 channels of input (up to 5.1 surround) encoded in Dolby Digital
    • Low-latency digital filtering
    • Accepts uncompressed digital audio input signals
    • Includes digital interpolation filter
    • Auto-samples at 32, 44.1, and 48kHz
    • Supports audio signals up to 24-bit with sampling rates up to 192kHz
    • THD+N rating: -93dB
    • Switchable input selection for video/audio scaling or signal pass-through
    • Equalizes and boosts HDMI signal for longer distance transmissions
    • Compact design with LED power indication

    Technical Specifications

    Spec Value
    Dimensions (W x H x D) 65mm/2.55" x 23mm/0.9" x 77mm/3.03"
    Weight 105g
    Operating Temperature 0 to +35°C (32 to +95°F)
    Operating Humidity 5 to 90% RH (no condensation)
    Power Supply 5V DC / 5W (CE/FCC certified)
    Power Consumption Max 1A @ 5V, 5W
    Input / Output HDMI V1.4a
    Max Video Clock Speed Input/Output: 300MHz
    Video Amplifier Bandwidth 10.2Gbps
    Video Impedance 100Ω
    Input Video Signal 0.5–1.2V p-p
    Input DDC Signal 5 volts p-p (TTL)
    Maximum Single Link Range 2160/30 @ 24bit True Color — 1080/24p @ 36bit Deep Color
    Transmission Distance Input: 7m/22ft (4K), 10m/33ft (1080p) — Output: 7m/22ft (4K), 10m/33ft (1080p)
    Max In/Out Resolution Up to 3840x2160p @24/25/30Hz
    Color Supported 4K/24bit, 1080p/36bit
    3D Supported Up to 1080/24p (frame packing/sequential, Blu-ray); interlaced stereoscopic (satellite/cable)
    Scale Up From 1920x1080p @24/25/30Hz to 3840x2160p @24/25/30Hz
    Scale Down From 3840x2160p @24/25/30Hz to 1920x1080p @24/25/30Hz
    Additional HDMI 2.0a 3840x2160p 60Hz YCC 4:2:0 format pass-through
    Audio Input Format 5.1 Dolby Digital or 2ch Stereo PCM
    Audio Output Format Passthrough or 2ch PCM with downmix selected
    ESD Protection ±8kV (air-gap discharge), ±4kV (contact discharge)
    Surge Protection IEC 61000-4-4 (EFT) 40A (5/50ns), IEC 61000-4-5 (Lightning) 25A (8/20μs)
    Electrical Fast Transient/Burst Data communication cord: 1kV, Power cord: 2kV
    Certification CE, FCC, RoHS, Dolby Digital

    Manufacturer

    Pulse-Eight Ltd. — 8-12 Alder Hills, Poole, Dorset, BH12 4AL, UK. +44 (0)1202 413610. pulse-eight.com. Pulse-Eight reserves the right to change products, information, and specifications without notice.