Sennheiser HD 400 PRO Studio Reference Headphones
| Brand: Sony | 
| Connection: Wired | 
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Headphone
| Earpiece Design | Over-Ear (Circumaural), Open-Back | 
| Earpiece Connection / Wearing Style | Headband | 
| Foldable | No | 
| Driver Type | Dynamic | 
| Impedance | 120 Ohms | 
| Active Noise Cancellation | No | 
Performance
| Frequency Response | 6 Hz to 38 kHz | 
| Resonant Frequency | None | 
| Maximum Sound Pressure Level (SPL) | 110 dB at 1 kHz / 1 Vrms | 
| Total Harmonic Distortion (THD) | 0.05% | 
Wired Connectivity
| Audio Connector to Source | 1 x 1/8" / 3.5 mm TRS Male Straight | 
| Connector Plating | Gold | 
| Adapter (Included) | 1/4" TRS | 
| Cable Design | Single-Sided | 
| Audio Connector to Earpiece | 1 x 1/8" / 3.5 mm Male | 
| Cable Length | 9.8' / 3 m (Coiled Cable) 5.9' / 1.8 m (Straight Cable)  | 
| Cable Color | Black | 
Environmental
| Operating Temperature | 5 to 131°F / -15 to 55°C | 
| Storage Temperature | -67 to 158°F / -55 to 70°C | 
| Operating Humidity | 90% | 
Physical
| Color | Black | 
| Environmental Protection | None | 
| Weight | 8.5Â oz / 240Â g (without Cable) | 
Packaging Info
| Package Weight | 1.53 lb | 
| Box Dimensions (LxWxH) | 10.6 x 8 x 4.4" | 
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