The driver size differs between the two (NA vs 10 mm), which can influence sound depth, bass response, and overall audio clarity. Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. Impedance levels vary (120 Ohms vs 42 Ohms), which can affect compatibility and audio output when used with different devices. Koss SB40 and SoundMAGIC E11 are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. The frequency response differs (20 Hz - 20000 Hz vs 15 Hz - 22KHz), which can influence how well the headphones reproduce lows, mids, and highs. Koss SB40 and SoundMAGIC E11 offer different noise cancellation capabilities (NA vs Sound Isolation), which can impact how effectively they block external noise. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. There is a noticeable difference in weight (NA vs 12 GM), which may affect comfort during extended use. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel.

Verdict: Choosing between Koss SB40 and SoundMAGIC E11 depends on whether you value better sound, longer battery life, or enhanced features.