Whirlwind ISOPOD2HW TRS Input / Balanced Dual XLR Output Transformer for iPod, HardwiredWhirlwind ISOPOD2HW TRS Input Balanced Dual XLR Output Transformer for iPod, Hardwired Optimized for connecting personal audio sources to professional audio system inputs. Use to connect CD and MP3 players, computer sound card outputs, mini headphone audio outputs, etc. to professional equipment with balanced inputs such as a mixing console.