A:AnswerHi Katie, Unfortunately, you cannot connect additional speakers to this unit. You might want to consider getting a Home Receiver instead like the Sony STRDH190. -Sam
A:AnswerHi Tray,
Yes, you can connect your smartphone to this system as long as it supports the A2DP Bluetooth proflle. Please check the specifications of your smartphone.
~Earl
A:AnswerHi 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
A:AnswerHi, Nana! Great news! This model has a Karaoke function. You may refer to page 37 of this link for more information:
https://www.sony.com/electronics/support/res/manuals/4691/b123b15f42f349942cccffa2d9b07f8b/46910571M.pdf
~Ralph