Review on JTECH-18GAE 4K@60Hz HDMI Embedder with Optical and 3.5mm Audio Inputs, Supporting HDR, CEC, and HDCP2.2/1.4 at 18Gbps by Michael Dixon

When you use TOSlink/optical input with this audio HDMI embedder and your home display is on *after* the rest of the system, the device emits extremely loud junk audio artifacts for a few seconds while connecting. When he first did this, one of my speakers got damaged. The only good thing here is that the speaker was still under warranty. The functional design of this device is completely loveless. I originally bought it to replace a cheaper unit that had annoying sync issues at times, but at least it had circuitry to mute the audio when power was removed and plugged in. Of course, any day of the week, I'll get annoyed with this dangerous junk at times. What good is a sound utility that wrecks your sound hardware? Also, despite having a digital signal at each stage of the chain, the picture quality was kind of fuzzy. Just a terrible unit.