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Peter Mc
August 23, 2016
Question

Connect no longer bit-perfect?

  • August 23, 2016
  • 450 replies
  • 29769 views
It looks like the Connect is no longer bit-perfect. Here's my evidence: let's discuss this.

First, I constructed a wav file of pink noise with amplitude ramping up from zero to digital max and back to zero.
I play this through my Connect and record the SPDIF output from the coax output into my PC.
The recording uses a Scarlett 8i6 audio interface set to use the Connect as master clock.
I record into a DAW (Sonar) multiple times - all instances are identical.
However, this recorded signal is not quite the same as the original wav file - it can be up to -21dB different.
See https://www.dropbox.com/s/t8od479xo9hi5el/connect_diff.PNG?dl=1
Note the expanded scale on the difference (third) track.

It looks like the difference gets larger when the signal is larger. To confirm this, I import the
original and difference files into Matlab and plot the raw data (difference vs original). There is clearly audio compression
happening here. See https://www.dropbox.com/s/p1yq6wcqafvnhaj/diff_vs_orig.png?dl=1
The scale is such that digital maximum is 1.

There also appears to be a slight bias when the waveform is negative and the signal is below the
compression threshold. See an expanded version of the previous plot
https://www.dropbox.com/s/9001tl9mkle4wly/diff_vs_orig_zoom.png?dl=1

Happy to answer questions about the method and conclusions.

Cheers, Peter.

p.s. Volume is set to fixed - I haven't tried variable.
In a loopback test (8i6 out from DAW to 8i6 in, no Sonos gear involved), I get bit-perfect cancellation.
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    450 replies

    Trending Lyricist I
    January 29, 2017
    Jgaite

    And I like you I want to make Sonos better than what it is today. I agree with you in on MQA. I personally would like to get batter mastered audio files streaming to our Sonos gear at a reasonable price. How ever that can happen is what I seek.

    I do not know your history with Bluesound but obviously you must have a long history with them to be so passionate.

    My personal quest for better sounding music involves many components: Sonos, other audio products and different sources of music (both purchased and 3 streaming services)

    It is because of the streaming services that I really enjoy the Sonos interface. It is the best I and I would like it to stay that way.

    Although my Sonos connect is ok on it own feeding some of my other equipment the sound was definitely improved by feeding an alternative Dac.

    I have 2 connects feeding 2 Schiit Yggdrasil DACs and then onto other equipment and speakers.

    The improvement in sound quality with the Schiit DACs Was quite apparent and worth every penny to me.

    I have Sonos equipment and speakers running in 7 rooms in my house so keeping within the Sonos environment is very important to me.

    My mentioning of Bluesound equipment it to draw attention what other competitors are doing in there quest to unseat Sonos.

    I personally want Sonos to use us the Sonos Community as a resource. To take suggestions and help make their future products better.

    Things are changing so fast these days that everyone including Sonos must do there best to stay ahead. The play 1 and the new play 5 were a nice addition to the Sonos lineup.

    In my opinion they also need to refresh the Connect and Connect Amp. Yes these possible refreshed devices may share some of the features of their competitors and that is a good thing.

    We are all guessing why there is a MIC in the new Play5. My hope is it will interface with Echo in the near future. Maybe a future Connect might have a similar MIC.

    A 12v trigger, a new MIC. It does not matter Any improvements to me are great as long as we keep moving forward. Let's not stick our heads in the sand.

    New enhancements can't just be software related. It must also include new equipment. I am a realist to know I will have to replace my connects just like I replaced my original Play5's. the original hardware is too old to support all the future enhancements Sonos has in store.

    I would just like Sonos to acknowledge our attempts in trying to make them a better Company. I would like them to provide feed back on why some of my ideas may not fall within their future plans.

    That ego stroking you refer to is not to benefit me. It is meant to benefit Sonos.

    We only need there participation
    chicks
    January 29, 2017
    I use Dot with a Wemo to power a vintage receiver via voice. 12V triggers are a bit old school.
    Trending Lyricist I
    January 30, 2017
    Hi Chicks

    I personally use a dot and a Harmony hub for similar task. I will agree to differ with you on the 12v trigger being old school. Most high end audio amps,preamps and Receivers have 12v triggers. My Audio visual processor has 2 -12v triggers that I find very important to me. Depending on the source I may only want 1 amp to come on(2 channel music) while on another source I want all 3 of my amps to come on for Movies etc.

    Anyways it is fun figuring out different ways to make things automated the way we like it. The more features just allow us an easier path to the end game. 🙂
    January 30, 2017
    Sonos must do there best to stay ahead. The play 1 and the new play 5 were a nice addition to the Sonos lineup.

    In my opinion they also need to refresh the Connect and Connect Amp.

    I would like them to provide feed back on why some of my ideas may not fall within their future plans.

    As to the first statement, Sonos sees it future markets for home audio moving in the direction of adopting the play unit kind of technology and I see no sound quality reasons - pardon the pun - as to why this is not a good thing. Given that state of affairs, it is quite obvious that devices like the existing Connect, that are meant for interfacing with legacy - and IMO now obsolete kit - is no longer a market of interest to them. These are choices that every company makes, given that resources are always in short supply. Those on the wrong side of the choice have to either decide to move forward with Sonos in the new direction, or move away from Sonos to other solutions that meet their needs better. These areas are now almost certainly niche markets for Sonos, that don't fit into their strategic choices.

    As to the last statement, sharing future plans is always walking a fine line. Sonos has said often enough what their future priorities are: Voice control, streaming services, and their speakers being used for home automation. One just needs to read between the lines as to the ideas that may not fall in line with their future plans; it isn't reasonable to expect them to say so for every new idea that bubbles up, although like any good company, they are probably keeping a tab on these.

    But I agree that there could be more active Sonos participation here, though I suspect it is another symptom of the scarce resources problem, and not arrogance.
    jgatie
    January 30, 2017
    No, the ego stroking is for you. Case in point; how big of an ego do you have to have in order to think you as a layman know what Sonos can do to make themselves better, and lord stars, those ideas just happen to coincide with your personal wants? And you are personally e-mailing the CEO to tell him? It's like the return of wappinghigh.

    Besides, if Bluesound is so superior in products and culture, you'd think you'd have switched to their product by now.
    January 30, 2017
    I keep hearing about Bluesound, I just looked at it on Amazon and found a total of 2 reviews for all their products - one a 4 star, another 2. Just one data point, I know, but compare that to the thousands of reviews for Sonos products, most of them 4/5 star. I don't believe that Bluesound does anything audible that Sonos cannot do for a lower average price point. And it does not do what Sonos can, that is essential for stable streaming around the home - the SonosNet mesh trick.
    Trending Lyricist I
    January 30, 2017
    Jgaite have a great day.LOL

    Kumar

    I am not sure about the the Bluesound performance myself. I hear that there were definite problems with their software interface. I am not sure if these issues have been corrected in there latest software. I just like the the hardware features they are offering. If I was to critique their hardware I would like to see a USB digital out added to the node 2.

    I am curious to know if I could tell the difference is sound quality between a Node 2 and a Connect. I would love to give it a try at my own house with my setups to see if bit perfect does make a difference in sound on my audio systems.. Unfortunately there are no stocking Bluesound dealers where I am.

    I might order one in the future to give it a try. Of coarse I would Prefer Sonos to come out with a similar offering in an updated Connect to save me the money:)
    Trending Lyricist I
    February 2, 2017
    Roon integration ( Roon version 1.3) just announced. Nice:)
    Trending Lyricist I
    February 4, 2017
    Update:)

    It may appears that Roon may have a solution. . From another forum "We do support lossless streaming up to the limits of the hardware, which are 48kHz/16bit audio."

    Great news if true. You just have to use alternative software.
    Trending Lyricist I
    February 4, 2017
    Sorry for the hope folks. Roon does not have any control over the hardware only what it sends to it.