Convert your 2.5mm headphones to fit 4.4mm Pentaconn Balanced outputs. Do your favourite balanced headphones have a 2.5mm jack? More and more products are boasting the 4.4mm Balanced output, meaning your 2.5mm just won’t fit. Put those frustrations aside and get the iFi 2.5mm to 4.4mm Headphone Adapter. Strong and robust, it’s perfect for the job.