I want to share my latest DIY work to be able to include outdoor speakers with only power connection being available.
I connected a Sonance Rock 63 to my network using the Arylic up2stream amp v4, a circuit board power supply and a junction box equipped for outdoor use (air exchange to avoid water entry but allow pressure equilazation with changing temperatures).
This works perfect and you don’t need to place underground cables. All you need is a power socket and WLAN or Bluetooth.
Happy to provide further details and used items for realization.