It turns out that a PS/2 Keyboard or Mouse Extension Cable works perfectly! I used this one: https://www.amazon.com/gp/product/B000067SLU/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
I love these speakers. How that I'm retired I took my work pair home and am installing them in my RV as the car radio speakers via a RCA to 1/8 stereo adapter.