Hi,
Yes, you are quite correct that most Beolab speakers have direct line input sockets to allow them to be connected to an amplifier with pre-out sockets. You need to ensure that you do not try to use a Line Out or Tape Record socket, as this will not be volume-controlled, so that speakers will be at FULL VOLUME (shouting intended), causing possible damage to your speakers and your ears!
Another issue to consider is that if your amplifier does not have pre-output sockets, you can use attenuated cables to reduce the signal levels to make them suitable for connection to the Beolab speakers. Speak to any B&O cable specialist to obtain these.
However, Beolab 2 and the newer centre speakers (eg. Beolabs 7.1, 7.2, 7.4, etc) do not have line input options, so you would need to get a competent engineer to build a trigger box for you to provide the required Powerlink switching signals to turn on the speaker. This is not difficult to do, but the trigger boxes are quite labour intensive (they typically take around an hour to build by hand).
Best regards,
Steve.
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