A:Answer Hi Ladybrown,
Connecting additional speakers directly to the unit is not supported. As an alternative, you can connect audio systems via the Party Chain function to create a more interesting party environment and to produce higher sound output. You may refer to pages 34-36 of this link for more information: https://www.sony.com/electronics/support/res/manuals/4691/b123b15f42f349942cccffa2d9b07f8b/46910571M.pdf
~Ralph