• Hopefully your knob is passive attenuation

    Yes, as described, just an Alps volume potentiometer in a box with phono sockets on the back. https://amzn.eu/d/2EnyQyf other colours and retail platforms are available

    simple for me does mean a volume knob

    There's no reason why you couldn't turn the volume to max on the remote/app/on-speaker control and use the knob-in-a-box as your user interface

  • happy to have never seen one before

    Horses for courses. I have a single line level source, so the knob is all I need between that and the power amps. I could just use the on screen volume slider since the source is a computer, but like you I prefer a traditional UI 🙂

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