[求助] NC20 PXC250谁降噪优？

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两款参数，请比较谢谢



PXC 250 耳机

这三款动圈立体声迷你耳机是森海塞尔最新推出的高档产品,拥有独特的、已注册的可折叠设计,质量轻巧;耳机锁可置于打开和关闭位置;配分离式头戴棉,增加舒适度。螺旋突形Duofol震膜;钕磁铁设计,使失真极少,确保声音细致、自然;高效、雄厚的音乐重播能力将树立流动音重播方面的标准。PXC 250通过使用独创的「NoiseGard」系统，可以减少约65%的噪音。

换能原理：动圈，封闭
频率响应：10-21000Hz
阻抗：300欧
总谐波失真：小于0.1%
声压级：（@1KHz，1Vrms） 106db
重量：（不含导线） 约65克
连线：1.8mOFC无氧铜线，3.5mm立体声插头及3.5mm双声道插头,带1/4寸(6.3mm)适配器
特色：专利抗噪系统,最大-15dB
供电：2个AAA电池

Sony NC20 （英文的，但是都是技术参数，应该能看懂）

Reduces Noise by 70% (10dB) when noise canceling circuit is switched on
Ideal For Travel gives you peace and quiet on planes, trains, buses and cars; quiets noisy air conditioners
Ideal For Outdoor Use when gardening or on a noisy street
Noise Canceling Circuit actually senses outside noise with built-in microphones and sends an equal-but-opposite canceling signal to the headphones; cancels noise from 50Hz to 1,000Hz, with a maximum of 10dB noise cancellation in the critical range from 100 to 400 Hz --where the human ear is super-sensitive
Noise Canceling On/Off Switch with red Power LED to indicate when Noise Canceling is operating; when Noise Canceling is off, headphones continue to function for music listening
Closed Headphone Design for even greater isolation from outside sound
30mm Diameter Driver delivers deep bass all the way down to 16 Hz; provides outstanding dynamic range
Neodymium Magnet for maximum energy in minimum size; ounce for ounce, Neodymium is far more powerful than conventional Samarium Cobalt or Aluminum magnets
Folding Headband and pivoting earpads make for easy storage in a backpack, briefcase or purse
Extended Battery Life approximately 45 hours with a single AAA alkaline battery
Detachable Input Cord to connect an audio source and listen to music
Gold-Plated Mini-Plug to connect an audio source; provides exceptional corrosion resistance, superb conductivity, low noise

    
   Type: Closed, Dynamic (with Noise Cancellation)

Driver Unit: 30mm

Magnet: Neodymium
Headband: Folding type
Power Source: "AAA" x 1 Battery
Battery Life: Approx. 45 hours (alkaline)
Approx. 23 hours (manganese)
Power Switch: Manual
Noise Reduction: >10dB at 300Hz
Impedance: NC Power On: 24 ohms
NC Power Off: 56 ohms

Sensitivity: NC Power On: 99dB/mW
NC Power Off: 98dB/mW
Power Handling Capacity: 100mW

Frequency Response: NC Power On: 16 - 22,000Hz
Cord and Plug: 1.5 ft (0.5m) cord with gold-plated micro plug;
Separate 3.3ft (1m) cord gold-plated stereo micro jack to gold-plated, L-shaped stereo mini-plug

    
   Soft Carrying Case
Plug Adaptor for use on airplane

    
   6.2 oz (175g)