Audio transformer 1:4 The transformer allows you to connect the audio line of the AIR Traffic (or other similar devices) to audio panels with high input impedance without automatic adjustment, e.g. GARMIN GMA340(A). Features:     Impedance ratio: 200:3.2K     Input/output: 200Ohm / 10KOhm     Robust design with cable connection for easy integration     Quality goods from Neutrik