HDMI Audio Extractor 4K 120Hz, avedio links HDMI Audio Conventer Splitter with HDMI to HDMI + 7.1Ch HDMI Audio + Optical Toslink SPDIF + Coaxial + 3.5mm Audio Jack, Support HDMI 2.1, HDR, VRR, HDCP2.3

This box simply works as detailed with very clear picture and audio. I'm very picky on both and have returned products due to the slightest noise that gets introduced but this box simply provides great picture and sound quality without any noise that I've noticed.There is one thing that I was trying to do with someone saying it should work but it doesn't. That is I was hoping I could get dolby digital 5.1 out through the coax I'm using from the box (or toslink would work also) while at the same time getting a simply audio signal (2.0 would be fine) out through the HDMI at the same time so my wife can simply watch prime or Netflix with sound from the HDTV speakers without worrying about turning on the processor to get the DD 5.1 sound to come on since she doesn't care about that, just wants sound out through the HDTV. When I got the DD 5.1 signal out through the coax output on the box using the 5.1 switch setting also on the box, my older process works great by providing DD 5.1 while no sound comes out from the HDMI output of the box to my HDTV. In truth, this is best since the HDTV doesn't need to be muted when listening to DD 5.1 since easy to forget and have sound coming out of both the HDTV and 5.1 speakers. Now I can select the Audio Copy on the remote or move the switch on the box to Pass Through to get sound from the HDMI output on the box but for some reason, DD 5.1 is not provided from the coax output of the box. My processor recognizes a lower level of sound such as prologic or some simulated DD 5.1. No worries, I can use the remote to use the Audio Copy to get audio from the HDMI output for my wife to use then use the remote to select 5.1 to get DD 5.1 from the coax output. I found the remote has to have direct line of sight to work since the box is hidden behind my stand but still not a problem. Really best to just have my wife learn to use the processor for sound, she can do it just fine. I wanted to share this in case someone finds the same thing. Someone replied to one of the questions indicating DD 5.1 should come out of the coax or toslink while audio also comes out of the HDMI output but this is not the case as I've detailed.Still this box is a steal for performance at the price and it provides 2 HDMI inputs to 1 which I also needed. I'm using a new Amazon Fire Stick 4K plugged into one of the HDMI inputs while using a Blu Ray player in the other. The box works as detailed to automatically switch to the latest device selected. So if already on the Blu Ray player it will switch if I select Home on the box remote or switch the other way by turning the Blu Ray player on.Glad items like this can be found that work great to support older equipment to prevent folks spending a lot more money to buy a new processor or HDTV with more inputs. I'm using this on a small HDTV sound system set up and not my main HDTV sound system so older DD 5.1 or DTS is just fine, sounds great actually.Hope this review helped someone.RHUPDATE: Box already doesn't work after only 1 week, neither HDMI input recognized. I plugged both HDMI cables directly into my HDTV with both recognized but when plugging back into the box, neither HDMI input LED lights up like before. I unplugged and plugged back in several times with no luck. With both HDMI inputs unplugged to the box, both LED's for the HDMI inputs light up along with the ARC detect button. So box is very confused and doesn't work. Already got it ready to ship back. This is very disappointing for being so satisfied in the beginning. I am looking at other similar devices with thousands of reviews with high marks instead of this one only having 25 so likely will pay more for another device that should hopefully be more reliable. The low price attracted me to this box which is fine if it continued working. Guess I'm glad it died so quickly to make returning it very easy. Reason I'm changing my score from 5 to 1, this kind of reliability issue is very problematic. I would be afraid the same issue would occur if I did tried another one.New update: Supplier for this item contacted me directly upon finding out about the issues I was having. The support has been about the best I've received from anything I've purchase from Amazon so credit they follow through with their support. Makes me believe the 1 year warranty is valid with them honoring it during this time if any problem occurs.I hooked up the new box and so far so good, box works as intended. The box is providing 5.1 DD and DTS along with switching automatically from one HDMI input to the next if I power ON the next device, takes a few seconds as the directions indicate is normal. Then when I turn the Blu Ray player OFF, box switches back to the other input with my Amazon Fire Stick 4K. I'm using the coax digital output due to all my toslinks inputs on my surround processor used. For whatever reason, it seems hard to find an item similar to this with coax also included. In any event, this box should hopefully work out much better since any electronic device can have issues when new. I'll try and update again after some time goes by to indicate if all is still working as it should. I think I'll leave the box powered ON all the time. I do this for my computer and select electronics that have lasted for decades without problem.Adjusting the overall score to 5 due to the great customer support.

Device works as intended but for your information it does not pass ATMOS and Dolby Vision. I tested it with hdr10 and hdr10+ and that works. Use the shortest HDMI cables possible with 2.1 version. The device sometimes cuts out so you have to turn it off and back on. Generally works just turning off power from remote and turning it back on. The frequency hz switch inside is buggy. It does pass hd audio format 7.1 via PCM (Dolby hd, dts hd ma etc). I'm keeping it because I like the build quality and it generally works for what I need. Passing HD audio from older audio systems that I still enjoy using. Hope this helps.

I was confused by many of the reviews for this extractor, but I bought it anyway. It’s a rare combination of manufacturer claims and features. Those that I have tested are true:-simultaneously outputs digital audio (coax and optical) and passes through hdmi WITH AUDIO-works with hdmi 2.0I am not using the hdmi switch or the analog outputs.I can only speak for my unit, but contrary to other reviews:- it has not gotten hot after 5 hours of use- the digital audio signal is totally clean...I’m a/b ing it with another output from the same source through the same dac and I can’t hear a differenceThese facts aside, I feel like this is the magical solution to a problem that I had already given up on. As a practical audiophile, I listen to only records and music streamed from my devices over airplay to an Apple TV. Everything runs through an integrated amp with a solid built in dac.But the pandemic drove me to hook a tv up to my stereo system and wreck my input game. The tv took my optical input and because I want to listen to streaming without having to turn the tv on (meaning I would have to use coax digital in) I had decided that the only real solution was a separate streamer... and the only one with the right features and quality was the amazing bluesound node 2i. Without getting too deep into it, airplay streams at a relatively low sample rate and a component like that is overkill but, again, the only apparent solution...until now!After a couple nights of visualizing, I just ordered this and set it up. Hdmi from the Apple TV to the box. Hdmi from the box to the tv. Coax digital from the box to the digital in on the integrated amp.Everything worked right away and it’s easy to test because the tv is hooked up to the same amp via optical.A couple notes:-I’m only using a stereo dac so I can’t speak to multichannel-there were audio dropouts coming from the tv at first, but I went back through the tv menus and reset the optical output and then it was fine. I wish I could be more specific but this new Samsung has been not so great with the audio settings.-for testing the sound quality I hooked up a Gen 2 Apple TV that has hdmi and optical outputs. Running hdmi through this thing to coax sounds to my ears on my system the same as optical straight out of the Apple TV.-let’s be real...it’s amazing how well it works but it is cheap: probably best not to plug cables in and and out too much and it has blinding red led lights on the front.-I don’t intend to use the weird little remote but it’s there.Right now I can stream music to the Apple TV from my phone with the tv off, or watch tv in 4K using the same Apple TV and the same speakers. And without buying a $500 streaming box or a dumpy receiver!It seems like it should have been simple, but I think this is one of the few, one of the best, and certainly one of the most cost effective solutions.I’ll be back to let you know if it breaks, but this is one of my all time biggest wins so far.Thanks for building it Avedio!

Unit appeared OK initially, low quality but for this price point expected. First unit worked well for about an hour and then Audio turned into static only, tried everything to fix but would not work. Returned and Amazon shipped replacement out quickly and replaced broken unit. This worked very well but the next day all lights were flashing and I unplugged unit (I did not turn off all night) and it worked again. Fast forward 2 hours and again Static only from Audio Outputs (Both RCA and 3.5m). May be good if you want 20 minus or to watch a movie but not for prolonged use. Returned and bought High End brand from Best Buy. Worked 100% Since without any issues. I don't recommend this unit.12/5/19 Update:The seller had the cheek to charge me $6 Return Fee for this JUNK. DO NOT PURCHASE FROM THIS SELLER! Amazon made this right but I needed to contact them and waste my Time. Links3C Technologies Is a BAD SELLER!