Everyone is jumping into the wireless bandwagon using Kleer, and I believe that wireless sonic bliss is not so far away in the future.
This time TDK releases their kleer wireless headphone, the TH-WR700, that runs on the 2.4GHz band to transmit 44.1kHz data over the 10m of air. The transmitter is able to feed signal to up to four headsets, so you can enjoy movies together with your friends, while your kid is sleeping next room. Battery life is quite awesome at 40 hours of continuous play. Aside from the wirless transmitter, the headphone itself is a foldable, portable design, with a closed design and a 34mm driver, and 32ohm impedance.
Expected retail price is 17,800 yen.
Specifications:
Model: Dynamic
Plug: 3.5mm stereo mini
Driver: 34mm
Wireless transmission: Kleer
Occupied frequency bands: 2.4GHz
Playback frequency: 20 ~ 20,000 Hz
Sound pressure sensitivity: 108dB/mW
Impedance: 32?
Maximum communication distance: sight distance of about 10m
Power Supply: four alkaline AAA batteries
Weight (without batteries): 170g (headphones), 20g (transmitter)
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The impedance information is useless, since this kind of phone always have their own amplifier in their headset.
Unless that 32ohm is the input impedance of the transmitter, but I doubt itn since normal analog stage usually would have much higher impedance (say 10′ and above)
Also, this wireless tranmission is done after (or with) analog input to the transmitter, which basically introduce too much processing in the chain.
(Digital material -> dac -> analog out (usually with amplifier) -> analog in (in the transmitter) -> ADC -> wireless digital transmission -> digital receiver -> DAC -> analog amplifier -> Transducer)
I doubt that the final sound come out would still have fidelity enough to the original source.
The more sophisticated approach is if the transmitter can receive digital input and directly send it to the receiver. At the headset.
Good to see some budget kleer cans. The kleer works great with mid-fi but there’s people who just want to here the TV without the line of sight limitations or interference issues that plague IR and 2.4 wireless headphones respectively.
If I didn’t decide to splurge on the RS180 for Dad, I’d get him these.