These speakers turn on when a sound signal comes in or with a external 5 Volts signal?

They turn on as soon as tjere is a signal, not like the ones going through the wireless transmitter.

If memory serve’s me right, the beolab 7 range need dedicated trigger voltage to a pin to turn on? They don’t have audio sense.

Hello dvprvt,

I'm sorry to hear that you are having problems.  You mentioned that all was working prior to the power interruption, so the correct cables should be in place and connected the right way.

It is possible that the power issue has caused damage, so are you able to try temporarily removing the UPS and extension cable please, to see if each speaker works when connected directly to the mains supply?

If this doesn't help, please take a look at the recess on the rear of the Beolab 7-1 centre speaker - you should see a small rubber cover, which can be removed with a fingernail edge.  Inside should be an LED light, which shows red when the speaker is in standby mode, or green when it is powered on.

With everything (receiver, speakers, powered cables, etc) switched on:-

1) If there is no LED then the speaker power may have failed, or the speaker is faulty,

2) If the LED is red, the powered cable is not supplying the trigger voltage to the speaker, or

3) If the light is green then the receiver is not supplying audio to the speaker.

Please let me know what you find and I will be pleased to assist further.

Kind regards, Steve.