This would require cables and adapters. The connection is complex as you have to get cables and adapters from a place like Radio Shack.
3.5mm stereo male jack to dual male RCA left and right (white/red). Connect the dual male RCA left and right to a dual female RCA that ends in a single male RCA. Connect the single male RCA (now stereo into mono) to a double female RCA. Now reverse the process. Connect to the other side of the double female RCA a single male RCA to dual female RCA (mono on left and right channels). Connect each of the two female RCA to dual male left and right RCA (white/red). Left and right channels don't matter since the audio is the exact same for both at this point. Connect the 3.5mm male to a double female 3.5mm adapter. Finally plug in your headphones or speakers to the female 3.5mm connection.
- 2 x 3.5mm male to dual RCA male (white/red)
- 2 x single RCA male to dual RCA female
- 1 x dual RCA female
- 1 x 3.5mm dual female
Happy mono listening on two channels.