AUX-0025 - Switching Amplifier Measurement Filter

Class D amplifiers use a switching process that adds fast-rising edges at the switching frequency to the audio output signal, presenting a difficult signal for audio analysis. The solution is to precondition the signal before presentation to the analyzer using a low-pass filter that reduces the out-of-band switching components (the fast edges) while passing the audio signal intact. The Audio Precision AUX-0025 Switching Amplifier Measurement Filter is a dual-channel passive filter that provides the necessary attenuation of out-of-band signals.