Topic by hillcow

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Topic: Pianoteq on Pi 5 - loud pop noises from studio monitors during bootup

I use a master-slave socket with my piano plugged in as master and the Raspberry Pi as well as the studio monitor speakers as slaves. The speakers turn on immediately, while the Raspberry Pi is booting. The speakers get the audio from my audio interface that is powered by the RaspberryPi, connected via USB (Behringer U-Phoria UMC204HD).

These popping noises are expected, but very loud and very annoying. The only way to not get them I think would be to power the audio interface after the RaspberryPi has fully booted. The PI 5 unfortunately is not able to control the power of the usb slots, otherwise I might have had some success with uhubctl (https://github.com/mvp/uhubctl).

Is there any solution you can think of?

Casio GP-300

Reply by Key Fumbler

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Re: Pianoteq on Pi 5 - loud pop noises from studio monitors during bootup

hillcow wrote:

I use a master-slave socket with my piano plugged in as master and the Raspberry Pi as well as the studio monitor speakers as slaves. The speakers turn on immediately, while the Raspberry Pi is booting. The speakers get the audio from my audio interface that is powered by the RaspberryPi, connected via USB (Behringer U-Phoria UMC204HD).

These popping noises are expected, but very loud and very annoying. The only way to not get them I think would be to power the audio interface after the RaspberryPi has fully booted. The PI 5 unfortunately is not able to control the power of the usb slots, otherwise I might have had some success with uhubctl (https://github.com/mvp/uhubctl).

Is there any solution you can think of?

Depending on the value of the loudspeaker system you may want to consider the option of adding a soft start circuit to the internal amplifiers. Not a trivial option though.

Reply by MrRoland

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Re: Pianoteq on Pi 5 - loud pop noises from studio monitors during bootup

I would use the gpio of the pi to controll a relay. You connect the output of the audio interface and the input of the speakers to the relay. When the pi is powered up you switch the relay to connect input and output.

Reply by MrRoland

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Re: Pianoteq on Pi 5 - loud pop noises from studio monitors during bootup

For some inspiration:
https://www.electronicshub.org/control-...pberry-pi/

Reply by hillcow

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Re: Pianoteq on Pi 5 - loud pop noises from studio monitors during bootup

I may have found a simpler and less expensive solution.

A power strip, where you can control the outlets via USB: https://energenie.com/item.aspx?id=7415

Unfortunately it seems they stopped manufacturing this power strip. But I managed to find a used one.

Casio GP-300