A:AnswerYes and with little difficulty. If you like bass you might still want to lower it as if it’s too high then the voices/words can be hard to understand.
A:Answer110 volt - We have been using it for over a month now (my husband uses it frequently) and it has not made any 'noticeable dent/increase in our electric bill.
A:AnswerThis unit receives Bluetooth from other devices, not sure it will transmit Bluetooth. You can order Bluetooth transmitter for headphone jack but it will transmit to headphone only.
A:AnswerYes, I have a Samsung UHD 4k and this home theater system work and sounds great. Just to let you know how much I like it I just got another one.