Question Connecting 2 receivers to play output to one set of speakers

[69banana]

I have two receivers that I am trying to connect to be able to play either on the same set of speakers. One receiver is a newer and is used for our TV, DVD, satellite, etc. The other receiver is pretty old and is connected to a phono and cassette player. Neither has any output audio connections. The old receiver just has Phono, 2 tape and 2 vcr inputs and speaker wire outputs.
I have some RCA plug adapter wires that look like I could use to connect the speaker output of the old receiver to an input of the new receiver ( thinking the CD inputs).
Will this work? Any harm in trying it? If not I'm guessing the only other choice is a speaker switch but they are more expensive and I have the RCA adapter.

 

[69banana]

I just gave it a try and it worked! I connected the speaker connections from the old receiver to the CD input of the newer receiver and am now able to play my old receiver components through the new receiver on the CD setting.