Hi, I just got a echo dot and I like it sofar but I would like to cast to a soundbar that I have. The soundbar is not bluetooth but here is my workaround scenario.. I have a old Galaxy S3 phone that is not in use that I can hook to the soundbar via the earphone jack. So I am wondering if I get the echo app on the S3, can I cast music from the dot to the S3 which I will always leave hooked up to the Sbar.. Is this doable or am I a idiot?