Sennheiser HD 350BT vs Sennheiser RS 120 II – Key Differences & Best Choice (2026)

Smart Control App. 30-hour battery life. Connect and interact. Personalise your Sound. Exceptional wireless sound. Superior Sound technology. Your audio companion for every need. App support providing an equalizer, Podcast Mode and Firmware updates. Intuitive controls including Virtual Assistant button for Siri and Google Assistant. Great wireless sound with deep dynamic bass and codec support including AAC and AptX Low Latency. USB-C fast charging and advanced wireless Bluetooth 5.0 technology for effortlessly reliable connectivity. Crafted from materials and with for outstanding durability with minimalist design available in a choice of white or black.

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.

Key Differences

The frequency response differs (18 Hz - 22000 Hz vs 22 Hz - 19500 Hz), which can influence how well the headphones reproduce lows, mids, and highs. If you're comparing Sennheiser HD 350BT and Sennheiser RS 120 II, both models offer a strong combination of sound performance, comfort, and modern wireless features. There is a noticeable difference in weight (238 gm vs 200 gm), which may affect comfort during extended use. Battery life varies between the two (30 Hours vs 20 Hours), which affects how long you can use them on a single charge. From a usability standpoint, both models provide a reliable and premium headphone experience. Sennheiser HD 350BT uses Bluetooth 5.0 while Sennheiser RS 120 II supports Bluetooth NA, which can impact connectivity stability and efficiency. Impedance levels vary (490 ohm vs 24 ohm), which can affect compatibility and audio output when used with different devices. Sennheiser HD 350BT and Sennheiser RS 120 II offer different noise cancellation capabilities (Active / Passive vs NA), which can impact how effectively they block external noise. The driver size differs between the two (32 mm vs NA), which can influence sound depth, bass response, and overall audio clarity.

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

Top Differences

Battery Life: 30 Hours vs 20 Hours
Noise Cancelling: Active / Passive vs NA
Driver Size: 32 mm vs NA
Bluetooth: 5.0 vs NA
Weight: 238 gm vs 200 gm

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Key Differences

Top Differences