I have a new yamaha reciever. I have the fire cube.
It only plays sounds from one set of speakers. For example, my rear speakers are BT. my front speakers are wired. If I play through BT, great, but I have no front sound. If I disconnect BT, the front plays great. Never both. Why?
You need to connect the cube to your receiver directly in one form or another. If you connect to those speakers by Bluetooth, this is how it would work. You may need to check with Yamaha for suggestions on how to accomplish this. Bluetooth is cranky and limited in flexibility for complex purposes.
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Bluetooth v4.x is monogamous, it only will only "hookup" with one partner (device) at a time. The cube is connecting to your Bluetooth speakers. The Cube and your Bluetooth speakers are in a one-to-one relationship. The Cube can't connect to another Bluetooth audio accessory until it ends it's relationship with the speakers.
Furthermore, once a device connects to a Bluetooth accessory (think about your phone and Bluetooth earbuds: the speakers on your phone "turn off") other audio output is disconnected. You can't listen to your phone with both your Bluetooth earbuds and through its speakers.
As far as your receiver and other devices are concerned, perhaps review the following: