The KEYSION dongle pairs a Cirrus Logic CS43198 DAC with a CT7601 headphone amp and supports DSD256 plus 32-bit/768kHz PCM, making it a feature-rich portable USB DAC/AMP for hi‑res sources; however, CS43198-based designs have been tied to a measurable "Cirrus hump" (DRE) distortion issue in multiple community tests, and resolving it has required vendor firmware in at least one other product. Good for users who want dual‑chip hi‑res playback and selectable gain in a tiny dongle, but expect potential DRE behavior unless the vendor provides a firmware toggle.
For listeners who want a tiny, feature-rich USB DAC/AMP (CS43198 + CT7601, DSD256/768kHz) and can tolerate potential CS43198 DRE risks; avoid if you prioritize proven measurement cleanliness.
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