Why isn't my Bose Music System II pairing w/my 6S like it did with my 6?

[iMore Question]

Have a BOSE Acoustic Music System II and purchased the accompanying wireless adapter - my iPhone 6 paired with no problem and I enjoyed all my music off the phone - now have the iPhone 6s and it will not pair - please help!

 

[Just_Me_D]

Can the aforementioned music system pair with multiple devices? If not, in-pair it from the iPhone 6 and then pair it with your iPhone 6S.