Hi. I have a soundbar 300. Can i use revolve plus as a rear speaker with soundbar 300
No.
Hi Kutay,
Thanks for posting and welcome to the Bose Community!
This isn't something that is possible as @DubCity has correctly informed you. The only speakers that can be used as rear speakers for this system are the Bose Surround Speakers 700 and the Bose Surround Speakers.
I hope this helps and if you have any further questions please do let us know.
Kind Regards,
Hector B - Community Support