I tried out cd in , to multiroom speaker group, worked well and seemed in sync. Tried streaming Amazon music to same multiroom speaker group and badly out of sync, and pure sound cut outs for large periods of time. Issue more to do with stream to group, not with amp being a speaker destination. When playing a locally downloaded amAzon music file, it sounds in sync, guess it’s using same source location local Wi-Fi, not to parallel source from internet?This product *looks* like an integrated amplifier. And a decent one at that. It can put out 60wpc into 8ohms or 110wpc into 4 ohms with an 84 SINAD. If your only usage is to stream Amazon Music and you want to simply hook this amp up to a set of speakers and have pretty good sound, this is a great product. However, don't use it for any other purpose. You can't run the DAC without the amp section or vice versa. I tried grouping this with an Echo Show so that I could have the lyrics scrolling on the Echo Show and the audio coming from this amp. Could never get that working reliably. Even streaming using the Amazon Music app on my phone resulted in too many disconnects. I also tried using it as an integrated amp to power the front four speakers in a 7.1 setup from an audio-video preprocessor. That was a complete failure. When given an analog input, the amp appears to first convert it to digital and then reconvert it to analog losing audio quality. But the DAC is also so seemingly slow that the AVP couldn't work with it. The room correction for the AVP placed the speakers more than 80ft away from listening position when they are about 5ft due to the delay introduced when using this device. I have gotten return authorization for mine. It's a cool device at a good price and I'm still thinking of keeping it. The Amazon eco-system of audio products is full of things that are *almost* great but then miss the mark. As an example, the audio output on an Echo Show is only 0.7volts of so. Fine for headphones but you can't drive an amplifier. Which is why I bought this amplifier. But then the audio won't sync like its supposed to. So that doesn't work either. I should have known that analog in would yield an A-D-A problem since the volume control appears to be digital. But that wouldn't be a deal-breaker if it weren't so slow since the audio would still be reasonable quality. I called about the broken app which was reported in a review three months ago and was told it wasn't a known issue. Hello, it's right there in the review. Does nobody at Amazon read these reviews to fix things? The app crashes for me just like the reviewer stated. I'm amazed that something could be allowed to languish this long. If the DAC is going to introduce so much delay at least offer an option to bypass it for analog sources even if that means it has to function as a speaker amp without volume control. These things are pretty basic for audio equipment. Have a digital out for the Echo Show so I could just plug it into the amp instead of having to rely on strange wireless technologies! I don't write many product reviews. I wrote this one just because I had such high hopes and don't want to see the next person be disappointedI add it to my home,specifically in my kitchen because I like ?‍? with ?. Working great with all my Alexa SystemSound quality so so. Can not broadcast to other echo devices when using Bluetooth source. Other then those issues awesome. Oh and it's an Alexa/echo product with no microphone... WTF ? & yet I still like it.I picked up Echo Link Amp since my Bose SA5 has been sitting with Bose for couple of months to get Airplay support. Reviews for Echo Link Amp were just ok, nothing special so I was a bit concerned. My setup needed to power 4 speakers - Bose Free space 51 and Polk Atrium 6 so I was not sure if this amp would be able to handle either.I was quite surprised when I connect all four speakers and at 50% volume, it was loud. I went up to 60% and didn't hear any distortion and didn't wanted to bother neighbors either. Out of the box, the sound is a little flat for my taste, though good thing is that you can change the EQ settings and apply a crossover. You can set this amp with other Alexa's for multi room too, you just need to be on the same network. Multi-room on Alexa actually works pretty good. Overall, I have used Bose SA5 for 5 years, and I think Echo Link amp + Alexa devices are decent replacement for the whole Bose SoundTouch multi room speaker line. I am already selling my sound touch and will actually sell my Bose SA5 too when I get it back.Here are the Pros -1) Price $299 vs $499.2) Way better iPhone App. Amazon keeps updating the app too. Bose Soundtouch app is buggy, loses connections to speakers, had to restart the app few times, it works though experience is pretty poor.3) You don't have to be on your home network to control the speakers.4) EQ settings + crossover support in the app.5) Has Line out for stereo, subwoofer and optical too in the back. I have connected my old Airport express which has Airplay support and line out. It works great. If you are not playing music from the Alexa app, it switch to RCA stereo automatically.6) Decent Internet music services. The ones I care about Pandora, Amazon Music, Audible and Apple Music are all there.7) Amazon's support is far superior than what I have experienced with Bose.Cons -1) I haven't seen ability to play music from NAS or DLNA. Personally, this is not a deal breaker for me since I rarely used this feature.2) App itself is designed more for Internet Radio. You cannot browse your library on the app. So you can see all Radio channels from Pandora, Apple Music, Amazon Music. In order to play an album, you have to ask Alexa to play a song or album. Again, this is not a deal beaker though this is something I hope Amazon adds it in their Alexa App. I understand this was not needed for Alexa devices though for the amp which is powering speakers outside in the patio, it would be nice.