You may be overwhelmed by the number of wireless speakers available today. I will help limit your choice by looking at some of the key parameters that greatly affect audio quality and speaker performance.
If you have a large house, it can be a daunting task to add speakers in other rooms. You may not want to drill holes in your walls to drive speaker threads. As an alternative, wireless speakers promise ultimate freedom and ease of installation.
Wireless speakers are more complex than standard speakers. They contain an amplifier that will affect speaker performance. The wireless receiver must also be of good quality and there are a large number of different technologies on the market.
The speakers are available in different sizes and with different watt. Typically, the higher the power, the higher the speaker. High-watt speakers are required for outdoor applications or if you have a large room. The built-in amplifier and drivers determine how much the speaker can handle. Speaker manufacturers will either provide maximum or RMS watt ratings. RMS watt is more objective than maximum power because it provides more clues about power amplifier and amplifier power supply. Maximum wattage is often overplayed by speaker manufacturers, as the speaker can only maintain the amount of short time distributions.
Both RMS and maximum power assessment are important when comparing different models. The maximum power value should be significantly higher than the RMS value because the music signals have varying effects and have large peaks.
Another important parameter is the speaker frequency response curve. Some manufacturers publish the frequency response scheme that is ideal for finding out how the linear speaker reproduces sound over the frequency and provide a good hint about speaker quality.
Harmonic distortion, also known as THD, will also affect the speaker's sound quality. This term is given either in dB or in percent and tells you how much the audio changes from the original audio signal. The wireless receiver, audio amplifier and even sensors contribute to distortion. Normally the higher the speaker is powered, the speaker's harmonic distortion increases. To enable easier comparison of different models, you want to search for harmonic distortion figures for different power data. At lower power output, the distortion is usually quite low. As soon as the output current approaches the maximum nominal power, the audio signal begins to be cut and the distortion increases sharply. Speaker converters are also driven in nonlinear areas and ensure that the speaker comes with high quality drivers.
The quality of the built-in amplifier will greatly affect sound quality and efficiency. Digital amplifiers are of course much more efficient than Class-A or Class-AB amps. High efficiency amplifiers eliminate heavy heat sinks and save electricity. Digital amplifiers often have higher harmonic disturbances than analog amps. This distortion is caused to some extent by the switch's FET stage in the amplifier.
Wireless speakers often have multiple sensors. Each converter is powered by another part of the audio spectrum. The audio signal is divided into different regions using a crossover. Regular crossings require quite large and heavy components if the speaker has a high watt. Alternatively, some models have separate amplifiers, one for each driver. The audio signal can then be divided into different regions by using small and cheap components before the amplifier.
It is important to choose a model that has a good quality wireless receiver. Input level speakers with 900 MHz analogue receivers will introduce a lot of audio and audio distortion during wireless transmission. Newer models use digital audio transmission and offer improved levels of signal-to-noise ratio and credibility to previous generation models.
Wireless speakers using digital transmission receive either uncompressed audio or use a standard like Bluetooth that compresses audio to some extent. Bluetooth audio transmitter uses audio compression and can usually not transfer to more than one speaker but offer the advantage that they do not need a dedicated transmitter.