Cordless speakers are designed to transmit and the reproduce an audio signal to moderate or large volume. Makers usually present the frequency range over which the wireless loudspeakers operate. This range is specified by listing two frequencies: a lower as well as upper frequency. To give an example, the lower frequency may be 20 Hz and the upper frequency 20 kHz. Using this specification it seems like the wireless loudspeakers can function as a set of HIFI loudspeakers. You could be tempted to go with a set ofwireless speakers which provides the greatest frequency response. Then again, there's far more to knowing a cordless speakers's functionality than simply understanding this simple range.
A large frequency response doesn't mean the cordless loudspeakers have good audio quality. For example a set of cordless loudspeakers with a frequency response between 30 Hz and 15 kHz may sound a lot better than a different set with a response between 10 Hz and 30 kHz. Also, each maker, it appears, implements a different technique of specifying the minimum and highest frequency of their cordless loudspeakers. The standard convention is to display the frequency range inside of which the sound pressure level of the speakers will decrease at most 3 dB from the nominal level.
Nevertheless, many makers disregard this convention. They push the lower frequency and upper frequency to where the cordless speakers barely provide any sound response. What's more, these figures tell absolutely nothing about how linear the cordless speakers are working inside this range. If possible you should really make an effort to get a frequency response diagram from the manufacturer. In this diagram, you'll find how the wireless speakers function inside the frequency response range. You can also discover any peaks or valleys the cordless loudspeakers might have. Peaks as well as valleys could potentially cause colorization of the audio. Ideally the wireless loudspeakers ought to have a constant sound pressure level inside the complete frequency response aside from the drop off at the upper and lower limit. Apart from the frequency response, a phase response chart will also tell a good deal about the overall performance and also quality of sound of the wireless speakers.
The conditions under which the frequency response was determined may also be important to understand. One condition that might influence the frequency response is the impedance of the loudspeaker driver built into the wireless speakers. Standard loudspeaker driver impedances range between 2 to 16 Ohms. The lower the speaker driver impedance the higher the load for the internal amplifier.
The frequency response of Class-D amplifiers shows the biggest change with various speaker loads because of the built-in lowpass filter that eliminates switching noise from the speaker amplifier's signal. However, the frequency response of the amp now is determined by the speaker driver load since the behavior of this lowpass filter is influenced by the load impedance. Commonly the lower the speaker driver load impedance the lower the upper cut-off frequency of the amplifier
Some of the newest digital amplifiers feed back the music signal following the lowpass filter to be able to compensate for this tradeoff and also to make the frequency response of the amp independent of the connected driver load. Then again, if the amplifier is not designed properly, this type of feedback could cause instability and cause loud noise being produced by the amplifier if specific loudspeakers are connected. Another approach utilizes audio transformers between the power stage of the amplifier and various outputs. Every output was created to attach a different loudspeaker load. This method helps to ensure that the amplifier is going to be loaded equally and in addition increases amplifier efficiency.