Sennheiser RS 120 II vs Philips ASH402BK/00 – Specs, Price & Comparison (2026)

2-year warranty. Appealing, modern design. Range of up to 100 metres (300 feet). Optional wall mounting of transmitter possible. Rechargeable NiMH batteries included (size: AAA). Open, stereo, supraaural, wireless RF headphone system. Suitable for all types of modern music and TV applications. Wireless freedom with reception through walls and ceilings. Very lightweight headphones, extremely comfortable to wear. Detailed, analytical sound reproduction with strong bass response. Transmitter with metal cradle for storing and recharging the headphones. Control elements conveniently positioned to provide easy, intuitive operation.

IPX4 splash and sweat resistant. Flat-folding design. Easy storage. From workout playlist to vital call. Sleek design. Flat-folding ear cups. 40 mm neodymium acoustic drivers. 20 hours play time. Stay-cool ear cups. Cooling ear cups. Train hard. Stay cool. Built-in mic with echo cancellation for clear audio. Quick Charge. Charge for 10 minutes, get 2 hours play. Smart pairing. Automatically find your Bluetooth device. Breathable ear-cup cushions. Easily detach for cleaning. Detailed sound. Good bass. Great passive noise isolation.

Key Differences

The driver size differs between the two (NA vs 40 mm), which can influence sound depth, bass response, and overall audio clarity. Impedance levels vary (24 ohm vs 32 ohm), which can affect compatibility and audio output when used with different devices. From a usability standpoint, both models provide a reliable and premium headphone experience. Sennheiser RS 120 II and Philips ASH402BK/00 are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. Sennheiser RS 120 II uses Bluetooth NA while Philips ASH402BK/00 supports Bluetooth 5.0, which can impact connectivity stability and efficiency. There is a noticeable difference in weight (200 gm vs 179 gm), which may affect comfort during extended use. The frequency response differs (22 Hz - 19500 Hz vs 20 Hz - 20000 kHz), which can influence how well the headphones reproduce lows, mids, and highs. Sennheiser RS 120 II and Philips ASH402BK/00 offer different noise cancellation capabilities (NA vs Passive), which can impact how effectively they block external noise. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel.

Verdict: Both headphones offer strong performance, and the right choice depends on your priorities such as battery life, comfort, and noise cancellation.

Top Differences

Noise Cancelling: NA vs Passive
Driver Size: NA vs 40 mm
Bluetooth: NA vs 5.0
Weight: 200 gm vs 179 gm
Impedance: 24 ohm vs 32 ohm

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Key Differences

Top Differences