Koss PRO-4AA vs Audio Technica ATH-E40 – Which One Should You Buy? (2026)

- Noise isolating professional studio headphones - The first dynamic headphones to deliver true full frequency, high fidelity performance - Standard-setting design incorporates performance-enhancing technology - Superior isolation, accurate sound reproduction and the excitement of a live performance with every recording - Durable steel and generously padded rubber headband - Adjustable slide bars ensure snug fit - 8 foot coiled cord with 6.3 mm (1/4") plug - Covered under the Koss Stereo phones Limited Lifetime Warranty

3-Year Warranty from Audio-Technica that covers manufacturing defects. The proprietary dual phase push-pull driver design of the ATH-E40 professional in-ear monitor headphones provides improved fidelity and efficiency. These headphones deliver powerful bass along with balanced mid and high frequencies to convey the full emotion of the music from the stage to the street. The headphones also come with a detachable 1.6 m (5.2') cable, with newly developed A2DC (Audio Designed Detachable Coaxial) connectors at the headphones and a 3.5 mm (1/8") stereo mini-plug output, and a carrying case. The ATH-E40 features specially designed housings that provide incredible isolation. The isolation â€“ and the comfort â€“ are enhanced by the four sizes of included silicone eartips (XS/S/M/L), which allow you to create a custom fit.

Key Differences

Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Koss PRO-4AA and Audio Technica ATH-E40 are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. Koss PRO-4AA and Audio Technica ATH-E40 offer different noise cancellation capabilities (NA vs Sound Isolation), which can impact how effectively they block external noise. There is a noticeable difference in weight (NA vs 10 GM), which may affect comfort during extended use. From a usability standpoint, both models provide a reliable and premium headphone experience. Impedance levels vary (250 Ohms vs 12 ohm), which can affect compatibility and audio output when used with different devices. The driver size differs between the two (NA vs 8.5 mm), which can influence sound depth, bass response, and overall audio clarity. The frequency response differs (10 Hz - 25000 Hz vs 20Hz - 20KHz), which can influence how well the headphones reproduce lows, mids, and highs.

Verdict: Choosing between Koss PRO-4AA and Audio Technica ATH-E40 depends on whether you value better sound, longer battery life, or enhanced features.

Top Differences

Noise Cancelling: NA vs Sound Isolation
Driver Size: NA vs 8.5 mm
Weight: NA vs 10 GM
Impedance: 250 Ohms vs 12 ohm

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Key Differences

Top Differences