Whirlwind ISOPOD TRS Stereo Input / Balanced XLR Output Transformer for iPodWhirlwind ISOPOD TRS Stereo Input Balanced XLR Output Transformer for iPod Housed in a high impact nylon casing, the ISOPOD safely sums to mono and transformer isolates unbalanced 1 8" (3. 5mm) stereo connections to balanced, XLR. Nominal insertion loss = 6 dB Use to create a balanced mono signal from MP3 players and computers to send to professional mixers' line inputs. (iPod and 3. 5mm cable not included).