The QuadCast and QuadCast S are identical in build and performance. However, the S has RGB lighting support and can connect to the HyperX NGENUITY software app. Both devices are condenser microphones with three 14 mm condenser capsules inside.
I compare the HyperX QuadCast to the QuadCast S. This video includes audio tests, and a demonstration of the lighting effects enabled by the NGENUITY software.
HyperX QuadCast S review: Light up your mic
HyperX QuadCast microphone review - SoundGuys
HyperX QuadCast vs QuadCast S — Stream Tech Reviews by BadIntent
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HyperX QuadCast S review: Light up your mic
HyperX QuadCast S Review
HyperX DuoCast Review and Sound Comparison!
HyperX DuoCast vs QuadCast — Stream Tech Reviews by BadIntent
HyperX QuadCast vs SoloCast: Which USB Mic is Better for Streaming & Gaming?
HyperX Quadcast S Review: Better Than The Duocast?