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Reli Rothko
Contributor I
September 8, 2017
Question

Receiver Line Out to Connect Amp Line In - Input Lag Question

  • September 8, 2017
  • 13 replies
  • 899 views
Hello, I'm considering adding a connect amp to our home. I currently have a 7.1 setup and am considering integrating the connect amp to the set-up. My thought is to connect the surround back L and R line-out to the line-in of the connect amp.

That way I can play music, where the receiver is, and not have to turn on the receiver. Also, whenever I watch TV with 7.1, I can still get the rear L and R channels to play through Sonos and also continue to listen to the show/event throughout the house.

What I'd like to know is if the audio lag is noticeable in this setup? I understand there would be a need to encode/decode the line-in signal to sync to other Sonos machines in the home, but was wondering if that has improved over the years via software, and the fact that there are other product offerings that are intended to work with a TV - like the play base.
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    pwt
    pwt
    Virtuoso
    September 8, 2017


    The connect is definitely the cleaner way to go . But, the benefit of the sonos amp is that its designed to be always on. What I'm trying to work around is the fact that the receiver needs to be turned on and switch to the sonos input. Not a big deal, but not as automatic as I would like.

    Good point. One does get used to the ease of spinning up music on Sonos speakers, and -- similarly -- the CONNECT: AMP.

    I have an old (IR-only) Harmony One remote that I use with all the AV kit, which gets me most of the way to automation, but it's still a two-step process for the CONNECT.
    4 x P:5 | Sub | 4 x P:1 | 3 x Connect | 2 x Boost | Connect:Amp | 2 x One | Amp | Move | Port | Era 300
    pwt
    pwt
    Virtuoso
    September 8, 2017
    My understanding is that delays start to become noticeable at about 200ms.

    Btw, scrub that thing I said -- at least for lip sync issues. Seems they're subconsciously noticeable above 40ms lag and consciously noticeable above 90ms lag.

    This white paper cites some Stanford research from 1993:
    http://www.prosoundtraining.com/site/wp-content/uploads/2014/02/Lip-Sync-Errors.pdf
    4 x P:5 | Sub | 4 x P:1 | 3 x Connect | 2 x Boost | Connect:Amp | 2 x One | Amp | Move | Port | Era 300
    John B
    September 8, 2017
    Clearly, encoding takes more than 0ms, but my point is that latency is fundamental to Sonos and the buffering is planned, not a flaw to be corrected.

    How long does encoding take, then?
    https://support.focusrite.com/hc/en-gb/articles/206674669-Does-analogue-to-digital-conversion-cause-latency-
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