TSP #234 - QuantAsylum QA403 24-bit, 0.0001% THD Audio Analyzer Review, Teardown & Experiments
In this episode Shahriar takes a detailed look at the QuantAsylum QA403 24-bit, extraordinary linear & low-noise audio analyzer. This low-cost instrument provides the means to test a wide range devices in the audio frequency range:
https://quantasylum.com/collections/frontpage/products/qa403-audio-analyzer
The review of the instrument is organized as follows:
00:00 – Introduction, instrument interfaces and overview
01:03 – Detailed teardown, architecture overview, ADC, DAC, amplifiers, attenuators and interface challenges; isolated properties, THD and SNR considerations
10:14 – Instrument extreme performance verification through loop-back; detailed GUI overview, ADC & DAC operations, attenuators, THD measurements, built-in generators and measurement functions
22:47 – Stanford Research Systems (SRS) DS360 Ultra Low Distortion Generator performance verification using the QA403
25:28 – Characterization of the SRS SR560 Low-Noise Preamplifier, linearity, THD+N, low-pass and high-pass filters responses, low-noise versus dynamic reserve measurements, automated sweeps
35:40 – Characterization of a two-stage audio amplifier and headphone driver module; gain and THD variation measurements as a function of frequency
38:55 – QuantAsylum family of products, example measurements and additional resources
39:27 – Concluding remarks
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