Sennheiser HD 620S vs Beyerdynamic MMX 300 PRO – Specs, Price & Comparison (2026)

Ultra-light 150-ohm aluminum voice coil for enhanced clarity and accuracy in audio reproduction. Closed-back headphones with steel-reinforced ear cup covers for distraction-free listening sessions. Reference-grade 42 mm angled transducers with 38 mm diaphragm deliver speaker-like imaging with natural detail retrieval and expansive soundstage. Lightweight chassis with steel-reinforced headband sliders and artificial leather arpads with internal venting for long-term durability and all-day comfort. Style meets durability: A steel-reinforced headband slider and earcup covers blend sleek design with robust construction for aesthetic appeal and lasting quality. Distraction OFF, sound ON: Open, expansive listening with noise isolation that immerses you in closed-back acoustics without sacrificing natural, airy and intricate audio quality. Enduring comfort, all day: A lightweight, sturdy chassis paired with soft, artificial leather earpads with internal venting and roomy ear cups for long, intimate listening sessions. A panoramic soundstage: Angled, 42mm dynamic transducers with 38mm diaphragms mimic a speaker setup and deliver balanced bass for focused listening - unparalleled in closed-back headphone design. Superior sonic precision: Ultra-low distortion at all frequencies, lifelike vocals and clear frequency bands, powered by an ultra-lightweight 150-ohm aluminum voice coil for optimal impulse response.

Closed Design. Made in Germany. Soft over-ear pads for high wearing comfort. Professional studio sound with gaming tuning. Maximum comfort for extended gaming sessions. Earpads, headband and cable as replacement parts. Headband pad with a recess in the area of the fontanel. High-quality microphone for excellent intelligibility of speech. Single-sided, detachable cable with an integrated remote control. Unique speech intelligibility thanks to high-quality condenser microphone.

If you're comparing Beyerdynamic MMX 300 PRO and Sennheiser HD 620S, both models offer a strong combination of sound performance, comfort, and modern wireless features. The driver size differs between the two (45 mm vs 42 mm), which can influence sound depth, bass response, and overall audio clarity. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. From a usability standpoint, both models provide a reliable and premium headphone experience. Impedance levels vary (48 ohm vs 150 Ohms), which can affect compatibility and audio output when used with different devices. The frequency response differs (5Hz - 40KHz vs 6Hz - 30KHz), which can influence how well the headphones reproduce lows, mids, and highs. There is a noticeable difference in weight (314 GM vs 670 GM), which may affect comfort during extended use. Beyerdynamic MMX 300 PRO and Sennheiser HD 620S offer different noise cancellation capabilities (NA vs Noise Cancelling), 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 Noise Cancelling
Driver Size: 45 mm vs 42 mm
Weight: 314 GM vs 670 GM
Impedance: 48 ohm Vs 150 Ohms

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Top Differences