SUM-QSPP | Stereo to Mono Summing Cable 1/8" Male TRS to 1/4" Male TS
Amazon.com: 3.5mm Stereo Male to Dual 3.5mm Mono Male Audio Cable, 1ft 3.5mm 1/8" TRS Male to 2 x 3.5mm 1/8" TS Male Y Breakout Cable Splitter Adapter for Headphone, Speaker :
Castline Gold Stereo to Mono Cable | Reverb
1/4 in TS to 3.5 mm TRS - Mono Interconnect | Hosa Cables