I have a bose 123 trying to hook up a Blu-ray player to it

Solution
If your Blue ray player does not support RCA outputs or Toslink then you will have to convert the HDMI to either one with a converter.

Toslink will give a better signal over RCA

Here is a HDMI Input to Toslink out Adapter that supports both Digital and Toslink outputs.

HDMI to TOSLINK Adapter - Audio Extractor By Stellar Labs (33-12740) MCM Part #33-12740$19.99
http://www.mcmelectronics.com/product/33-12740?scode=GS401&utm_medium=cse&utm_source=google&utm_campaign=google&scid=scplp7139836&sc_intid=33-12740&gclid=CKOM26-j_tACFQkHaQodycQE4A

MCM is one of my favorite places to look for odd ball items and audio related parts.

delaro

Distinguished
If your Blue ray player does not support RCA outputs or Toslink then you will have to convert the HDMI to either one with a converter.

Toslink will give a better signal over RCA

Here is a HDMI Input to Toslink out Adapter that supports both Digital and Toslink outputs.

HDMI to TOSLINK Adapter - Audio Extractor By Stellar Labs (33-12740) MCM Part #33-12740$19.99
http://www.mcmelectronics.com/product/33-12740?scode=GS401&utm_medium=cse&utm_source=google&utm_campaign=google&scid=scplp7139836&sc_intid=33-12740&gclid=CKOM26-j_tACFQkHaQodycQE4A

MCM is one of my favorite places to look for odd ball items and audio related parts.
 
Solution