Product Description
The JR170 operates on a 900 mHz radio frequency band. The system consists of a high quality, battery-operated stereophone, RF transmitter and AC adapter. Utilizing a radio signal, the JR170 allows listeners to move freely from room to room, even outdoors without the need for additional transmitters or experiencing a signal break. The signal can be transmitted through walls, ceilings and floors and is not affected by bright sunlight. Listeners can roam freely over 150 linear feet.The JR170 incorporates a two channel stereo synthesized operation in its transmitter that utilizes a microprocessor to automatically lock to one or two selected transmitter channels in the event of potential signal interference. The transmitter connects easily to most home theater systems and PCs through the headphone jack (3.5mm) or RCA audio outputs.Neodymium iron boron magnet structures and oxygen-free copper voice coils in the stereophone element, deliver a clear signal transmission, and wide frequency response of 20-18,000 Hz. Closed ear cushions isolate the listener from ambient noise, while retaining the bass frequencies. Operating on 2 "AA" batteries, the stereophone will provide approximately 25 hours of uninterrupted use. A volume control on the earcup allows for easy level adjustment.
Product Description
Enjoy headphone quality sound without cumbersome cords. The Koss JR-900 Cordless Stereo Headphones include RF stereophone, transmitter and AC power adapter to give you the freedom of cordless listening. The five channel stereo transmitter lets you enjoy your favorite music, even if the stereo is in the next room or upstairs. The tereophone provides multiple sound source capability when used with additional transmitters. It also features Stereo/Mono switch, power indicator and volume control. The closed ear cushions give you better bass boom.
Amazon.com Product Description
The Koss JR-900 cordless stereo headphone system consists of a transmitter and a set of 10-ounce headphones with a built-in receiver for cordless listening from almost any audio source, including your stereo, VCR, DVD player, or computer. The transmitter offers a choice of five stereo broadcast channels for optimizing transmission. Using separate channels, you can even use more than one system in the same vicinity.
The JR-900 also comes with a rechargeable built-in nickel-cadmium battery pack capable of powering the headset for approximately 10 continuous hours. The set is covered by Koss's lifetime warranty.
Customer Reviews:
Koss Has Balls Asking This Price For These Headphones!.......2006-02-15
Ok lets face it, wireless headphones certainly haven't been perfected yet and any wireless headphones that operate on radio frequency (like these headphones) are going to have some kind of hissing and reception noise but I expected a little more at this price from Koss considering they're suppose to be state of the art in headphones! For Koss to have the balls to ask $300.00 (at Koss.com $400.00) is totally ridiculous! These wireless headphones are no better than wireless headphones that cost anywhere between $50.00 - $100.00. The sound quality is a little better than cheaper wireless headphones but what sinks these is the reception. I don't recommend these for this price, it's a total rip off! The only benefit to owning these is the lifetime warranty.
Hiss and break-up.......2001-01-11
If you like quiet music or wish to be mobile then these are definitely not for you.
Unless the volume reaches a certain level, then there is just too much hiss. To drown out the hiss you either need to increase the volume sufficiently that you cannot hear anything else in the room (that's not very high since these are closed earphones), or play different music.
Even when you are within 2 meters of the transmitter, moving your head just a couple of inches can result in signal break-up.
If you are prepared to sit still and listen to rock music at the right volume then the sound quality really is quite good. However for over $200 more flexibility is expected both in terms of mobility and clearity.
In mono the hiss goes away, as does the signal breakup (within 10 meters). However, you are paying for stereo headphones.
The batteries don't last long (maybe 4 hours) and to recharge them you must connect a cable between the headphones and the base unit and push a switch on the base. With some other makes you only need sit them on a stand. Also the batteries cannot easily be swapped. So if you want to listen for 6 hours, or you forgot to charge them, you'll just have to wait until they are recharged. You cannot just insert a new battery.
They are a bit on the heavy side.
Something I do like is that there is no tuning dial for the radio signal, so cannot accidently detune them.
Classical listeners will be disappointed.......2000-10-18
Listening to classical CDs throughout the house was my goal in purchasing these cordless headphones. General reception is pretty good, although it does fade in and out somewhat as I move through the house. Most annoying, however, is a constant background hiss, which distracts from the high quality sound I hoped for.
Your satisfaction with this product will probably depend on your listening preferences. Most radios stations and many pop-type CDs would come through just fine. Discriminating lovers of more quiet music will not be satisfied.
What a Great Combo.......2000-06-17
Koss JR900 Cordless Stereo Headphones are the best in cordless. I've shopped around in many stores looking for such a bargain. I can't find one. The average price was 500.00. These headphones can work throughout my whole house! I just plug them into my computer and listen to MP3's while I clean. There great and very comfortable. I will encourage everyone to buy these well made Headphones.
Product Description
Provides cordless listening from your stereo, video or computer sound source - transmits through walls or ceilings
Multiple sound source capability when used with additional transmitters
On/off switch, channel selector switch power indicator and volume control
Frequency response: 20Hz-28kHz
Includes RF stereophone, transmitter, AC power adapter
Product Description
Provides cordless listening from your stereo, video or computer sound source - transmits through walls or ceilings Five-channel stereo transmitter provides interference-free personal listening Multiple sound source capability when used with additional transmitters Stereo/Mono switch, power indicator and volume control Frequency response: 20Hz-20kHz Includes RF stereophone, transmitter, AC power adapter, and rechargeable NiCd batteries
Product Description
Provides cordless listening from your stereo, video or computer sound source - transmits through walls or ceilings
Multiple sound source capability when used with additional transmitters
On/Off switch, channel selector switch power indicator and volume control
Frequency response: 20Hz-28kHz
Includes RF stereophone, transmitter, AC power adapter
Product Description
Provides cordless listening from your stereo, video or computer sound source - transmits through walls or ceilings
Five-channel stereo transmitter provides interference-free personal listening
Multiple sound source capability when used with additional transmitters
Stereo/Mono switch, power indicator and volume control
Frequency response: 20Hz-20kHz
Includes RF stereophone, transmitter, AC power adapter, and rechargeable NiCd batteries
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