Question: how to connect iphone to music system via usb?
Answer: Connect the device to the USB A port ( A) of the speaker. For details about connection, see Related Topic below.
Tap [SongPal] on your smartphone/iPhone to start up the application. SongPal.
Tap [SRS-X99].
Tap [USB].
Select a song from the list and start playback. Music will be heard from the speaker.