Both headphones are designed for comfort and can be used for extended listening sessions without major discomfort. Koss Pro4s and Koss SP540 are premium wireless headphones designed to deliver high-quality sound along with advanced features like noise cancellation and long battery life. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Both models provide a wide frequency range, delivering a balanced audio experience across different types of content. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment.

Verdict: Choosing between Koss Pro4s and Koss SP540 depends on whether you value better sound, longer battery life, or enhanced features.