Coaxial Attenuator
Digital Wireless Headphones Review – The New Trend In Wireless Technology?
Not disturbing others while watching TV at night is likely still the main use of wireless headphones. Wireless headphones in particular are enjoying a high popularity by not being tied to a cord. Traditional wireless headphones could however never match corded headphones in terms of sound quality and realiability. The main culprit would be the wireless transmission itself which would be prone to noise and interference. New advances in wireless technology promise to remedy these drawbacks. We will review two models of wireless headphones which utilize the latest transmission technology to find out how these products compare to traditional corded headphones.
The two review models are the Sennheiser RS180 and the Amphony Model 2500. Both models use the latest digital audio transmission technology. This means that prior to transmission of the audio signal by the transmitter, the signal is first converted to a digital data signal which then gets transmitted. Inside the digital wireless headphones, the signal is then converted back to an audio signal. Using this digital transmission, none of the two models showed any hissing or distortion that we are used to from previous wireless models. Both headphones claim to transmit true CD quality audio.
The first thing we noticed is that the Sennheiser headphones are designed as open headphones which means that sound from the headphone transducers will penetrate to the outside of the headphones while the Amphony model is closed. There is no way to state that any particular design is better of the other and as such it is a matter of personal preference. A closed design, such as the Amphony, will reduce the sound level heard by others which is good when listening at loud volume without bothering others. At the same time, a closed design will tend to attenuate exterior noise more. Both headphones have comfortable velours ear cushions and fit snugly on the head.
The RS180 transmitter acts as a cradle for the headphones while the headphones are not in use. It offers one analog audio input, yet no digital audio inputs. The Model 2500 transmitter offers three audio inputs: one analog input, one coaxial digital input and one optical digital input. This is particular important since most modern plasma TVs no longer have analog audio outs. The transmitter has an auto-switch mechanism which will select the correct audio input depending on which input has a valid signal.
Judging the sound quality of both models, the sound of the RS180 is on the light side with good mid range but a little low on bass. As such we feel the RS180 is suited for listening to vocals and light music. The bass response of the Model 2500 is more pronounced than the RS180 but still well balanced and not overly aggressive in any way. The wireless transmission itself no longer suffers from the drawbacks of previous generation models and the sound quality of both models rivals the quality of corded headphones. One limitation though is since wireless models are battery powered, they will never be able to achieve the same loudness as corded headphones hooked up to a good headphone amp. Having said that, both models achieve plenty of volume though, the Model 2500 more so than the RS180.
The RS180 sends it’s signal at 2.4 GHz. The transmitter supports up to four headphones. The Model 2500 operates at 5.8 GHz and supports an unlimited number of headphones. The RS180 operating ranged is specified by Sennheiser as 300 ft In an indoor test environment, we were able to get a clean signal up to around 100 ft with both the RS180 and the Model 2500 which should be plenty for most users. The Model 2500 transmitter can connect to secondary transmitters which are called RangeBoosters that allow expanding the headphone operating range even further.
The RS180 offers a battery life of 15 hours. The Model 2500 will work around 30 hours per charge. Pricing is around $300 for the RS180 wireless headphones and $200 for the Model 2500.
RF and Microwave Attenuators
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Agilent 11583C Coaxial Attenuators Set $1,000.00 |
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ANRITSU MP59B 50Ohms DC~3Ghz Coaxial Switch $569.00 |
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33340-60004 13DB Fixed Coaxial Attenuator,2.4MM $299.00 |
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Bird Electronics 8321 50W Tenuline Coaxial Attenuator $299.95 |
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HP Agilent 08493-60014 Coaxial Attenuator 6dB 3.5mm $269.99 |
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AGILENT 08493-60017 Coaxial Attenuator, 30dB, 3.5mm New $250.00 |
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Weinschel 100watts 30db DC-18Ghz 48-30-43 High Power RF Coaxial Attenuator 50ohm $269.00 |
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Agilent / HP 08971-60102 Coaxial RF Attenuator, DC to 26.5GHz, 3dB (08493-60002) $260.00 |
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BIRD ELECTRIC CORP. TENULINE COAXIAL ATTENUATOR 3dB $225.00 |
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BIRD TENULINE 8321 COAXIAL ATTENUATOR 50 WATTS, 30 DB $188.00 |
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*New* HP 8491-A 40db Coaxial Attenuators Set w/ Manual $249.99 |
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33340X-OPT013 Fixed Coaxial Attenuator, 13DB $199.00 |
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Agilent 8493C Coaxial Fixed Attenuator, DC to 26.5 GHz 0.20dB $195.00 |
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HP AGILENT 8768K COAXIAL SWITCH $189.99 |
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NARDA, Switch, RF Coaxial, DC-18.0 GHz, 28VDC, SEM163T $190.00 |
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HP Agilent 8768K, Coaxial SP5T Switch, DC to 26.5GHz, w/ Opt K30 $175.00 |
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Narda 369BNM 175W 18Ghz dummy load Coaxial Termination $155.00 |
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WEINSCHEL 1432-4 High Power Coaxial Termination $175.49 |
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Agilent/HP 8491A 20dB Coaxial Attenuator DC-12.4GHz $145.00 |
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Agilent/HP 8491A 6dB Coaxial Attenuator DC-12.4GHz $145.00 |
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HP/Agilent 8493C Coaxial Fixed Attenuator, DC to 26.5 G $150.00 |
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Bird 8321 Medium Power Coaxial Attenuator – Parts Or not Working $75.00 |
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44-60 Weinschel Lab Standard Fixed Coaxial Attenuator $135.00 |
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HP Agilent 8493C Coaxial Fixed Attenuator, 26.5 GHz to 20 db $125.00 |
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HP/Agilent 8493C Coaxial Fixed Attenuator, 26.5 GHz to 6 dB $99.00 |
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Made for ZTE 100w 33db High Power RF Coaxial Attenuator 50ohm $99.00 |
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8491B-006 Coaxial Fixed Attenuator, DC to 18 GHz, 6 dB $95.00 |
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