The driver size differs between the two (9 mm vs 40 mm), which can influence sound depth, bass response, and overall audio clarity. There is a noticeable difference in weight (50 gm vs 209 gm), which may affect comfort during extended use. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. Impedance levels vary (16±3.2 ohm vs 32 ohm), which can affect compatibility and audio output when used with different devices. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. If you're comparing JBL C150SI and JBL C300SI, both models offer a strong combination of sound performance, comfort, and modern wireless features. Both models provide a wide frequency range, delivering a balanced audio experience across different types of content. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios.

Verdict: Choosing between JBL C150SI and JBL C300SI depends on whether you value better sound, longer battery life, or enhanced features.