A home theater bypass is a special feature found on some A/V receivers that allows you to use the receiver as if it were not there. This can be useful if you want to route audio directly from your Blu-ray player or TV to your speakers, without having to go through the receiver.
In order to use the home theater bypass, you will need to connect the audio output of your device directly to the audio input of your speakers. You will also need to set the volume on your device all the way up, and then adjust the volume using your speaker's volume control. Keep in mind that when using this bypass, you will not be able to take advantage of any of the receiver's other features, such as Dolby Atmos or DTS:X surround sound.