Template:1/4 TRS to 1/4 TRS
The output side is 1/4 inch (6.35 mm) Tip-Ring-Sleeve jack Tip-Ring-Sleeve and the input on the Bose sie is 1/4 inch (6.35 mm) Tip-Ring-Sleeve jack Tip-Ring-Sleeve so use a cable like this.
1/4" TRS Balanced Patch Cable (audiopile.net)