The main purpose of the impedance adaptor is to address the issue that occurs when high-power devices are connected to low-impedance, high-sensitivity in-ear monitors. This can result in excessive background noise or very loud sound even at lower volume levels, making it difficult to adjust to an appropriate volume.
This impedance adaptor from FiiO helps to mitigate this by providing a better impedance match.
To add some flare to your setup, try a golden cudgel version with beautiful raster laser engraving!
Available in 75Ω or 33Ω, 3.5mm or 4.4mm