iFi IE Match 4.4mm Balanced Headphone AttenuatorThe new iEMatch4. 4 Optimise your balanced listening with the iEMatch4. 4. It works with all 4. 4mm balanced devices. The iEMatch4. 4 has both ultra ( 24db) and high gain ( 12db) sensitivity adjustment to help you get the most out of even your most sensitive headphones and IEMs. Benefit from better sound, increased dynamic range, reduced background hiss and clearer vocals Once tried, your listening wont be the same. Simple. Instant. Improved. As with