Yes, you can connect the Amazon ECHO to the Samsung HW-B550 soundbar.

Connecting to a Panasonic TV: 👌

Hello. The power consumption of 25 Watts relates to domestic current of 240 volts. The 410 Watts is musical power. It is therefore the system's amplifier that consumes 25 W of electricity and delivers 410 Watts of listening power.

Yes, it is included. However, I recommend additional small speakers for surround sound. The soundbar itself is not that much better than the TV speakers.

Nope

No

Hello Martina, The bass box is connected via Bluetooth, so you can also connect the two rear speakers without cables... Samsung SWA-9200S Set 1 x 140 W, stereo ... Greetings Roger

👍👍👍

According to the manufacturer, no HDMI cable is included in the scope of delivery. For product advice/recommendations, it is best to contact our customer service directly at https://helpcenter.digitec.ch/hc/de/requests/new. Your request can then be examined individually. Your enquiry can then be examined individually.