AUX-0025 Input Impedance

Created on 2009-12-09 00:58:00


What is the input impedance of the AUX-0025?


Up through 20 kHz, it is fairly accurately modeled as a 10 nF capacitor in parallel with a 500 Ω resistor, each value having a tolerance of about 1-2%. This is a fairly low impedance, and is designed for testing power amplifiers that have an effective output impedance of less than 2 Ω. Using the AUX with a normal audio line level circuit will result in severe HF loading and flatness problems.