SMSL SU-9 Balanced DAC Review - Best DAC under $500?

SMSL SU-9: https://shenzhenaudio.com/products/s-m-s-l-su-9-mqa-full-decoder-es9038pro-dac-xmos-dsd512-pcm768khz-32bit-bluetooth-5-0-uat-aptx-hd-usb-balanced-decoder
Discuss the SMSL SU-9: https://forum.headphones.com/t/s-m-s-l-su-9-dac/8580?u=resolve

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Learn about headphone measurements and frequency response: https://www.headphones.com/pages/measurements-and-frequency-response
How frequency response impacts sound signature: https://www.headphones.com/pages/how-frequency-response-impacts-sound-signature
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Source equipment
Amp - SPL Phonitor X: https://www.headphones.com/products/spl-phonitor-x-headphone-amplifier?variant=376861360149
Amp - Cayin IHA-6: https://www.headphones.com/products/cayin-iha-6?_pos=1&_sid=41be6560e&_ss=r
DAC - iFi Pro iDSD: https://www.headphones.com/products/ifi-audio-pro-idsd-dac?variant=12694240985159
DAP - iBasso DX220: https://www.headphones.com/products/ibasso-dx220-digital-audio-player?_pos=1&_sid=24e0cbb9e&_ss=r
Matrix Audio X-Sabre Pro: https://www.headphones.com/products/matrix-audio-x-sabre-pro-mqa?_pos=2&_sid=7f62f5062&_ss=r

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