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With a digital optical audio signal, the volume is not controlled by your TV or this device, but by the Bluetooth headphone or speaker connected to it. You would use the volume control on each Bluetooth speaker (or piece of Bluetooth furniture) to control its individual volume. So in this case, you would turn up the volume on the built-in speaker to increase the volume. As for the echo, it is most likely caused by a difference in the Bluetooth hardware between the two couches. With headphones it's typically not a problem if the timing is slightly off, but with speakers it creates an echo, which is why it's always safer to have both speakers be the same brand/model. You can test this by turning on only one couch at a time - this should cause the echo to disappear. If you have any additional questions on your specific setup, we recommend giving a call to our tech support department at 626-965-1008, M-F 9am-5pm PST.
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