Wireless Speaker Transmitter - Buying Guide

!±8± Wireless Speaker Transmitter - Buying Guide

Before we get in-depth into wireless speaker transmitters, let us first understand how wireless speakers actually work:

Every wireless speaker system works on any of the following three systems:

1. Radio Frequency (RF)
2. Bluetooth
3. Infrared (IR)

Radio Frequency

Of these three technologies, RF has been around the longest and is the most widely used. In this system, a wireless speaker transmitter is plugged into the TV/computer/audio device. This transmitter sends out a radio signal at a fixed frequency to the speakers, which in turn, produce sound. This is the same principle on which cordless phones work. While this technology is quite reliable with a strong range, it is prone to disturbance from electrical fields and conflicting frequencies from cordless phones, radios, etc.

Bluetooth

Bluetooth is the latest technology. It works by establishing a remote connection between two Bluetooth enabled devices, which can then be used to transfer data. If you have a Bluetooth enabled phone, you've probably already used this technology to send and receive data. Fast, reliable, and safe from disturbances, Bluetooth is slowly making inroads into the home audio market, though its uptake is hampered by issues of range and compatibility (older audio devices do not support Bluetooth, especially the non-iPodTouch music players).

Infrared

Infrared is probably the least common technology. It works on the same principle as your TV remote by using a particular spectrum of light to send and receive data. If you've noticed, you can't use your TV remote unless it is pointing directly at the TV. Similarly, wireless speakers working on IR need to be directly in sight of the wireless speaker transmitter to work. This obviously limits their portability, and hence, this technology hasn't quite caught on.

Wireless Speaker Transmitters

Most wireless speaker transmitters work on RF. A universal wireless receiver/transmitter plugs into your existing speaker setup (wired) and essentially turns it into a wireless system. It effectively eliminates complex speaker wiring (which, as anyone will tell you, can turn into a labyrinth of cables very, very quickly), and is ideal if you want to set up a home theater system without the hassle, or install a set of outdoor speakers without running a series of wires through your house.

A wireless speaker transmitter typically has a range in excess of 100 feet, with at least 2 audio channels and 6-8 wireless channels to eliminate disturbances (if one RF channel creates disturbances, you can simply switch to another channel). Make sure to check out the total power available with the transmitter. If you buy a low powered transmitter to work with a high-end, high-wattage speaker system, the performance will suffer a great deal. Another key spec is the audio latency. Basically, this is the amount of latency or waiting period between a signal being transmitted by the device and it's rendering by the speakers. Since the signal is being transmitted wirelessly, the latency period is always much more than a regular wired system. The lower the latency, the better.

Sony, Samsung, JBL, etc. all make wireless speaker receivers that work seamlessly with different speaker setups. Here are some recommended wireless speaker transmitter models:

1. Samsung SWA-5000 Wireless Receiver
This elegant wireless speaker transmitter sells for and features 2 audio channels, 6 wireless channels, and total power of 133~167W x 2. The audio latency is a healthy 18ms. A great looking device that will look right at home with your high-end speaker system and LCD TV.
Price: .99

2. Rocketfish RF-RBAUX Wireless Transmitter
Featuring Rocketfish's proprietary 'Rocketboost' technology, this wireless transmitter may well be mistaken for a modem or router instead. While it may not have the sleek design of the Samsung SWA-5000, it is nonetheless, a great performer and works with pretty much any speaker system. The Rocketfish RF-RBAUX has a solid range and will work perfectly well in a large house. Now you can have music playing wirelessly in every room of your house!
Price:

Other recommendations: Sony ALTEC-ALT-A33PC Wireless Delivery System. Works like a charm. Included receiver can store and free up your music for delivery in another room.

Wireless Speaker Transmitter - Buying Guide

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Understanding The Frequency Response Of Today's Wireless Speakers

!±8± Understanding The Frequency Response Of Today's Wireless Speakers

Wireless speaker suppliers normally publish the frequency response of their products which, however, doesn't automatically explain to you a great deal about the sound quality. I am going to make clear the meaning of this term and additionally give some recommendations on how to interpret it while looking for a set of wireless loudspeakers.

Wireless speakers are meant to transmit and the reproduce a sound signal to moderate or high volume level. Suppliers normally show the frequency range over which the wireless speakers function. This range is specified by listing two frequencies: a lower as well as upper frequency. By way of example, the lower frequency might be 20 Hz and the upper frequency 20 kHz. From this specification it seems like the wireless speakers would be able to operate as a set of HIFI loudspeakers. However, there is certainly a lot more to understanding the wireless speaker's functionality than simply taking a look at these figures.

It seems like there are numerous techniques which manufacturers employ while specifying the frequency response. Typically, the frequency response shows the normal working range of the wireless loudspeakers. Within this range, the sound pressure level is essentially constant. At the lower and upper cutoff frequencies the gain will decrease by no more than 3 decibels.

However, several producers push this standard to the limit and often will show a maximum frequency where the wireless loudspeakers will barely produce a sound anymore. Additionally, just considering these 2 figures does not say much about the linearity of the frequency response. Consequently it is best to have a complete frequency response chart. This kind of chart is going to show whether or not there are any sort of considerable peaks or valleys inside the operating frequency range. Peaks and valleys might result in colorization of the audio. Ideally the sound pressure level of the wireless speakers should be linear throughout the entire working range.

The circumstances under which the frequency response was measured may also be necessary to fully understand. In fact the internal amplifiers might have different frequency responses depending on the speaker driver element that is built in.

This change is most apparent with a lot of wireless speakers that use digital amps, otherwise known as Class-D amplifiers. Class-D amplifiers use a lowpass filter inside their output as a way to reduce the switching components which are generated by the internal power FETs. Then again, the frequency response of the amp now is dependent upon the loudspeaker driver load since the behavior of this lowpass filter is influenced by the load impedance. Typically the lower the loudspeaker driver load impedance the lower the upper cut-off frequency of the amplifier

Some amplifiers incorporate feedback to be able to compensate for changes in gain caused by different connected loads. Another approach makes use of audio transformers between the power stage of the amp and various outputs. Every output was designed to connect a different speaker load. This method makes sure that the amplifier will be loaded equally and also improves amplifier power efficiency.

Understanding The Frequency Response Of Today's Wireless Speakers

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