Attenuator Model

Scorpion Truck Mounted Attenuator TMA 100kph Crash
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US $18,710.00

Newport Research NRC Model 935 3 High Power Attenuator
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US $1,199.00

Newport Model 935 3 High Energy Variable Attenuator
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US $825.00

Flann Microwave Model 1811 Precision Rotary Attenuator
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US $798.00

Newport Compensated Attenuator Model M 925B $1659
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US $795.00

Variable Attenuator Weinschel Model 9364
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US $500.00

Attenuator Model

Review Of Two Digital Wireless Headphones - The New Trend In Wireless?

Being able to watch TV at night and not disturb others has been the driving force of wireless headphones. In particular the benefit of not being tied to a headphone cord has led to rapid growth of wireless products. However thus far wireless headphones could never really match the sound quality of traditional corded models and the wireless transmission would be prone to interference and noise. Is the latest wireless technology able to remedy the problems of previous wireless headphones? We will take a look at two wireless headphones that both utilize the latest in wireless transmission to find out how these models stack up against traditional corded headphones in terms of sound quality and reliability.

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.

One of the most important aspect of headphones is the sound quality. The sound of the RS180 is on the light side with good mid range but a little low on the bass. Therefore the RS180 is well suited for listening to vocals and light music. The Model 2500 has more pronounced bass but still is well balanced and not overly aggressive. Neither model is suffering from the problems of previous wireless headphones and the sound quality of both models rivals that of corded headphones. Since wireless headphones are battery powered, they will naturally not be able to achieve the same loudness as corded headphones hooked up to a good headphone amp. However, in our testing, both models achieved sufficient volume, the Model 2500 a little more so than the RS180.

The RS180 transmits it’s signal at 2.4 GHz. Up to four headphones can operate simultaneously per transmitter. The Model 2500 transmits at 5.8 GHz and supports an unlimited number of headphones. The operating range of the RS180 is specified by Sennheiser at 300 ft. During our indoor testing we were able to get a clean signal up to around 100 ft with both models which should be sufficient for most users. The Model 2500 transmitter comes with an extension port though that allows connection of secondary transmitters for cases where you really need to have reception all over the house.

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.