This is a custom made extension cable Compatible for Logitech z-5400 z-2300 z-5500 z-5300 z-5450 z-906 z-680 z-623 Computer Speakers Control Pod
This cable does not work on the Logitech Z623 speakers as the nuts and bolts are not compatible.
The cable is 6ft long, for longer length, multiple cables can be combined. Here's a length chart:
1 cable = ~ 6ft
2 cables = ~ 12 ft
3 cables = ~18 ft
4 cables = ~ 24 ft