What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Sony MDR-CD7

 Building full-size equipment capable of properly reproducing Sony's new media is difficult enough. Add the constraints inherent in headphone design, and you'll understand the design challenge of the MDR-CD7 headphones. To be effective with the ES Series' digital-quality sound sources, they had to combine wide, linear response, deep bass output, and full dynamic range. On top of all that, they had to be lightweight and comfortable to wear.

Only the Size and Weight are Small.
The solution?  An innovative transducer design. The MDR-CD7 uses a small but very strong Samarium Cobalt magnet for startlingly wide frequency-response. And a high compliance 24K gold ion plated diaphragm exhibits extraordinary amplitude, resulting in an impressive dynamic range of 135 dB.
For comfort, the slightly off-center mounting position of the urethane earpads guarantees proper side pressure distribution and good balance for all wearers. The pads themselves are specially designed to conform to the ear, further increasing comfort, providing 30 dB of isolation from ambient sound and extending bass response.

Paying Careful Attention to Detail
The cord is made of nearly pure copper. More copper means less oxygen content - since oxygen interferes with the transmission of the sound-carrying electrons, that means the MDR-CD7's wire provides clear, open sound.
With a conventional system, all this careful construction and expensive material might seem like overkill. But with Sony's new digital-quality media, even little things make a big difference.
That's why the MDR-CD7 headphones sound so sensational.
Headphone Type:  Closed, dynamic
Driver Type:  30 mm diameter; Dome driver (24K gold ion plated)
Sensitivity:  110 dB SPL at 1mW
Frequency Response:  2 Hz - 24,000 Hz
Impedance:  45 Ω
Rated Power:  10 mW
Power Handling Capacity:  50 mW
Cord:  3 m (30 feet) OFC Litz wire
Plug:  Sony Uni-Match design with both stereo miniplug and ¼" phone plug

Weight (without cord):  80 grams (3 ounces)

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