using a splitter cable kinda need some help

using a splitter cable kinda need some help

for those of you Who know electronics and what not. Im having some trouble hooking things up. So I have a Kenwood Model 650 in mint condition connected to some JBL Circa 1970’s Studio Monitors. I want to use a splitter cable to run one to my headphones and to play from the monitors. Any ideas on what i need to plug where?

How do the speakers connect to the unit?

pm sent.

i have the manual for the kenwood 650 but it wont upload