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Audio Precision System Two 2322 dual domain audio analyzer - $1,500 (santa cruz)
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After 20 mins. warm up, It passes it's two distortion self-test, see the photos. From 20Hz to 20kHz it's below 0.00025%.
It just misses passing the level test, off by around 0.005 db or so. Both channels track very well, this is probably a simple adjustment,
it just was not worth it for me as it's so close.