QA451 Frequency Response and THD+N

Has anyone tested how much roll off there is at 20kHz and would QA451 be able to test amps at -120THD+N(assuming the ADC can test down to -122THD+N)?

Hi @Serieri, the ADC by itself might his about -115 THDN. To get to 120 and beyond you’ll need a notch. Look for a thread or two here on the E70 for some measurements around -123 or -124.