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No, you do not need an external power supply, but it is recommended. You can see what the maximum power output of the AMP is when being powered from Pi compared to external source - https://www.justboom.co/technical-guides/amp-boards-power-specifications/
This amp can run speakers up to 2 x 55 Watt peak output at 8 ohms (2 x 30 Watt RMS)
RetroPi is built ontop of the Rasbian OS, so following this guide should get you setup with the AMP - https://www.justboom.co/software/configure-justboom-with-raspbian/
The JustBoom Pi Zero AMP pHAT is a high quality amplifier designed specifically for the Raspberry Pi Zero. Simply stack the HAT onto your Pi Zero and then connect your speakers. An external power supply is required for the AMP Zero pHAT.
With no soldering required and all the mounting hardware already provided, the Pi Zero pHat is a true plug and play device. Enjoy flawless high quality audio playback within minutes of setting it up.
Need help with deciding what JustBoom product you need? Check out the product guide.
Pi Zero AMP pHAT Features:
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