Wireless audio frustration is almost never about the "Bluetooth number" on the box. It is about A2DP codec negotiation, the SBC fallback and its bitpool ceiling, AAC's inconsistency across phones, the aptX and LDAC marketing math, the latency-versus-quality trade-off, and the slow split to LE Audio with LC3 and Auracast. This is the protocol-level honest version.
Lc3
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Bluetooth Audio Explained