Q: What are the benefits of transmitting the full data rate without using audio compression ?

A:Since our transmitter transmits a data rate of over 3 Mbps (3 million bits per second), the audio can be transmitted without audio compression. Also, forward error correction can be used. The reason that other systems use audio compression is to reduce the extremely high data rate of a pure (uncompressed) audio signal in order to either be able to store that signal or transmit that signal more easily.

The biggest drawback of using audio compression is that the quality of the audio signal is reduced, such as in MP3-compressed audio. This is because audio compression removes parts of the music. Some types of music which are particularly difficult to compress without noticing audio degradation. Systems using audio compression are not able to deliver CD-quality audio.

Q:Will my 2.4 GHz cordless telephone or wireless LAN affect the operation of the transmitter / amplifier or vice versa ?

A:Wireless LANs typically work at 2.4 GHz and will not affect the operation of the amplifier, nor will any 2.4 GHz cordless phones or Bluetooth devices. However, some 5.8 GHz cordless phones may cause the amplifier to mute. The range of the transmitter may also be affected during the operation of other 5.8 GHz equipment. If you do operate a 5.8 GHz cordless telephone, we recommend that you purchase our 2.4 GHz transmitter / receiver to eliminate any possibility of interference. Whether or not the amplifier will be affected by other 5.8 GHz devices depends to a large degree on the type of equipment and the distance between such equipment and the amplifier relative to the audio transmitter. Digital cordless telephones are more likely to cause problems than analog cordless telephones. The base station of certain types of cordless telephones, such as the Panasonic Gigarange series, will periodically broadcast signal beacons, even when the telephone is not in use, that may cause a clicking noise of the amplifier. Walls located between such equipment and the amplifier will in many cases attenuate an interfering signal enough for it not to cause any problems when operating the amplifier. The amplifier employs an error correction scheme and thus can tolerate interference up to a certain degree without any signal degradation. If interference is a problem and if there is no direct line-of-sight to the audio transmitter then we recommend the use of the Model 1550 transmitter which transmits a stronger signal than the Model 1520 transmitter..

Q: What does the noise shaping filter do which is part of the amplifier ?

A:Digital audio, such as audio on a CD and the audio transmitted to the amplifier, is represented by numbers that represent voltage levels. When analog audio is converted to digital audio, the voltage of the audio signal is sampled and represented by a number that refers to the voltage that comes closest to the actual voltage. Because there is usually a small difference between that voltage and the actual voltage of the analog audio signal, a certain amount of noise - quantization noise - is introduced. The amount of such quantization noise is, among other things, determined by the amount of information that is used to represent each sample - resolution. Therefore, digital audio on a CD and audio transmitted to the receiver always contains a small amount of quantization noise which limits the maximum possible signal-to-noise ratio of the transmission. In order to increase the signal-to-noise ration beyond that limit, the receiver features a special noise shaping filter which is a 5th-order filter that outputs the audio at 64 times the sampling frequency and shifts the audio data quantization noise to higher frequencies that are outside of the audible frequency band. As a result, the amplifier is able to achieve a higher signal-to-noise ratio than would be possible without a noise shaping filter.

© 2004 Amphony

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Amphony 1550 manual Amphony

1550 specifications

The Amphony 1550 is a cutting-edge wireless audio transmitter and receiver system designed for seamless audio streaming in various environments. This innovative device is highly regarded for its ability to deliver high-fidelity sound with minimal latency, making it an ideal choice for music enthusiasts, home theater systems, and professional audio setups.

One of the standout features of the Amphony 1550 is its wireless capabilities. Utilizing advanced wireless transmission technology, the Amphony 1550 can transmit audio signals over a distance of up to 150 feet, allowing users to enjoy their favorite music or content without being tethered to their audio source. This is particularly advantageous in settings where mobility is essential, such as during parties or while moving around the house.

The device supports multiple audio formats and is compatible with various audio sources, including televisions, computers, smartphones, and tablets. Users can easily connect the Amphony 1550 to their devices via standard audio cables, including RCA and 3.5mm jacks. This flexibility ensures that the device can be integrated into a wide range of existing audio systems, enhancing the user experience without the need for costly upgrades.

Another notable characteristic of the Amphony 1550 is its sound quality. The system is engineered to deliver pristine audio reproduction, ensuring that every note and detail is captured accurately. With support for high-resolution audio formats, users can enjoy rich, immersive sound that enhances their listening experience. The low latency performance further ensures that there is no noticeable delay between the audio and the visual content, which is especially important for movie watchers and gamers.

The Amphony 1550 also boasts user-friendly features, such as easy pairing and a streamlined setup process. The intuitive design ensures that users can quickly get their system up and running without a steep learning curve. Additionally, the robust build quality and reliable performance make the Amphony 1550 a durable investment for anyone seeking an efficient wireless audio solution.

Ultimately, the Amphony 1550 stands out as a versatile and high-performance wireless audio device that caters to a variety of audio needs. With its impressive range, compatibility with multiple audio sources, and superior sound quality, it is a perfect choice for both casual listeners and audiophiles alike. Whether for personal use or professional settings, the Amphony 1550 delivers a remarkable audio experience that is hard to beat.