Whirlwind Isopod2HW Stereo Isolation Box

The Isopod2HW is built for one job: connecting personal audio sources to professional audio system inputs. CD and MP3 players, computer sound card outputs and mini headphone outputs all come out unbalanced and at the wrong level for a console, and this box fixes both at once.

It is the hardwired version in the Isopod2 family, so the tails are permanently attached rather than plugged in, which is what you want in a rack or a lectern where a loose adapter would go missing.