Our UE Buffer Jack is an inline 3.5mm adapter for sources that are too loud at low volume settings or add audible hiss when paired with sensitive IEMs. Placed between the source and your IEM cable, it reduces the incoming signal level and can help quiet hiss caused by an impedance mismatch. Use it with custom UE Pro IEMs or the UE Universal Series when an aircraft entertainment system or another 3.5mm source is too loud or adds hiss. It doesn't convert connector formats or replace a cable — both the source and the IEM cable must use 3.5mm connections. Inline signal-level adapter Reduces output level from high-output sources Can help reduce audible hiss caused by an impedance mismatch 3.5mm male and female connections Compatible with UE Pro IEM cables ending in a 3.5mm plug Included with UE Pro IEM packages sold in Europe to meet regional output-level requirements Does not convert a non-3.5mm source connection or change the connector at the earpiece