88
Sony MDR-RF4000K
$170.00
Released April, 2010
The Pros:Easy to install and have set up in a minute. Enough volume output for the hearing impaired. Excellent range, don't have to stay in one spot while listening.
The Cons:Need to be a bit careful with them, can be damaged if they're dropped.
The Sony MDR-RF4000K is a pair of digital wireless headphones that uses 2.4GHz wireless technology to transmit a signal from the transmitter up to 100 ft. In particular, Radio Frequency (RF) transmission sends the signals between the transmitter and the headphones.
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These signals allow for high-fidelity audio reproduction. Featured are high-powered, 40mm closed Neodymium drivers that keep ambient noise out while outputting quality audio along a wide 10Hz-22,000Hz frequency range. Plus the unit comes with a rechargeable NiMH battery that lasts up to eight hours on a single 15-hour charge. In case the battery ever dies, it can be replaced with either a regular or rechargeable AAA battery. Ultimately, the Sony MDR-RF4000K is a midgrade wireless unit. There are models with greater power handling, larger drivers, and improved frequency, but their prices tend to range over $200 or even $300.
Features
- Closed, Dynamic Earbud Headphones
- Aluminum Body
- No Redundant Vibration
- Smooth Bass Response
- Clear Mid-High Range
- Large Neodymium Magnets
- Low Power Handling
- Extra-Wide Frequency Range
- No Ambient Noise
- High-Resolution Diaphragm
- High-Quality Audio
Specifications
- Distortion: 1% or less
- Driver Unit: 40mm, Closed
- Frequency: 10Hz-22,000Hz
- Infrared Carrier Frequencies: 2.404 Ghz – 2.476
- Range: Approximately 100 ft
- RF Modulation: GFSK
- Input Jack: Phono Jacks (L/R), Stereo Mini Jack
- Weight: 300 g
Battery Details
- Charging: 15 Hours
- Life: 8 Hours
- Type: AAA Ni-mH x2
- Voltage: DC 5.2 V (AC)
Included
- AC Power Adaptor
- Connecting Cable
- Rechargeable Battery
- Unimatch Plug Adaptor
User Reviews (1)
Pros & Cons
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1
easy to install and have set up in a minute
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1
enough volume output for the hearing impaired
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1
excellent range, don't have to stay in one spot while listening
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1
sound quality is above average for wireless headphones, good coverage of the sound spectrum
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1
fairly light weight, don't feel like they're pressing down on you
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1
plenty of bass support, good for sound effects and dynamic basslines
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1
stylish design, seem like a high-end piece of stereo equipment
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1
need to be a bit careful with them, can be damaged if they're dropped
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