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  1. #1
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    SB3: Switch-Off S/PDIF when SB3 in stand-by

    Hi all,
    I am using a SB3 for sourcing audio to a pair of Genelecs (8331) via S/PDIF (AES/EBU).

    The Genelecs use signal sensing for powering on/off. They interpret the presence of a bit-clock as 'power-on':
    https://support.genelec.com/hc/en-us...ignal-Sensing-

    Undortunately, the SB3 keeps the S/PDIF output active even when set to standby. That prevents the Genelecs from powering down.

    Is there any chance to disable the S/PDIF-output when the SB3 is in standby? Any SW-hack? Any HW-modification?

    I would highly appreicate any input!
    Cheers,
    Hering

  2. #2
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    Any signal inside that I can use for reading the on/off-state? Any enable pin that is connected to a fixed state that I can redirect to that on/off-state? Any idea to use an additional CMOS-logic chip to incorporate that on/off-state that I will use to switch the S/PDIF signal?

    How about using a RPI with a HIFIBerry DIGI+? Any chance to achieve it there? Unfortunately I would lose the sexy VFD-display...

  3. #3
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    Quote Originally Posted by Hering View Post
    Hi all,
    I am using a SB3 for sourcing audio to a pair of Genelecs (8331) via S/PDIF (AES/EBU).

    The Genelecs use signal sensing for powering on/off. They interpret the presence of a bit-clock as 'power-on':
    https://support.genelec.com/hc/en-us...ignal-Sensing-

    Undortunately, the SB3 keeps the S/PDIF output active even when set to standby. That prevents the Genelecs from powering down.

    Is there any chance to disable the S/PDIF-output when the SB3 is in standby? Any SW-hack? Any HW-modification?

    I would highly appreicate any input!
    Cheers,
    Hering
    As a workaround could you switch the speakers to a different input to allow them to sleep. I have to do this with my DAC as the TV optical output is always on. Just shows the Intelligent Signal Sensing isn't all that intelligent. I wonder how many devices do actually switch off the digital outputs in standby.

    Sent from my Pixel 3a using Tapatalk

  4. #4
    Senior Member ralphy's Avatar
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    There is a player setting in audio to do exactly that.

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    Ralphy

    1-Touch, 5-Classics, 3-Booms, 2-UE Radio
    Squeezebox client builds donations always appreciated.

  5. #5
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    Ralphy, I have tried that option but it does not seem to work for me (LMS 7.9.2). Both digital outputs seem to remain active...

    Is this behaviour specific for MY installation only?

  6. #6
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    And another thought, Ralphy, where you seem to be the best guy to answer it: How about switching to PiCorePlayer with an HIFIBerry DIGI+ HAT? Any chance on wiring a GPIO to an enable input on the DIGI+ chip (whatever that might be)?

    Cheers!

  7. #7
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    If you're prepared to use a trigger signal from the player to control the power to your speakers (eg. using a relay), then you could use the PowerSwitch plugin on the SB3 - this puts out a 3V DC signal on the heaphone socket when the player is on.
    piCorePlayer has a power on/off GPIO control facility, which can deliver a 3.3V DC signal on the GPIO pin of your choice when the player is on. If you use a DIGI+ HAT then you'd have to choose a GPIO pin that it doesn't use and passes through.
    Transporter -> ATC SCM100A

  8. #8
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    Quote Originally Posted by Hering View Post
    And another thought, Ralphy, where you seem to be the best guy to answer it: How about switching to PiCorePlayer with an HIFIBerry DIGI+ HAT? Any chance on wiring a GPIO to an enable input on the DIGI+ chip (whatever that might be)?
    I'm using a Hifiberry Digi+, connected to "sensing" powered speakers over S/PDIF. The output of the Hifiberry switches off when nothing is playing and the speakers power off a few minutes later.

    Name:  Screenshot 2021-01-03 at 22.42.48.png
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Size:  20.1 KB
    Last edited by jeroen2; 2021-01-03 at 14:49.

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