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

[Hering]

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

[Hering]

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...

[slartibartfast]

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

[ralphy]

There is a player setting in audio to do exactly that.

[Hering]

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?

[Hering]

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!

[cliveb]

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.

[jeroen2]

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.