So This Is Christmas

Merry Christmas is such an infectious feeling I like to feel that way all year around.

So if you are visiting just before Christmas, just after Christmas or even here on Christmas day I am sure you will find something of interest for you and in the spirit of Christmas.

It may be said that Christmas is no longer a celebration but this must be spoken by people that have never had trouble closing their eyes on Christmas Eve in an expectation of what maybe left for them on the carpet under the tree.

I continue to look forward to the surprise on my Grandchild's faces to this day at Christmas events.

Merry Christmas - Merry Christmas - Merry Christmas

Thursday, January 9, 2014

Tips And Hints For Buying Wireless Loudspeakers

By Michelle Finger


When choosing a brand new set of wireless speakers, you most likely are going to take a look at the technical specifications. One often found spec is the frequency response. This specification even though significant will not tell the entire story pertaining to how great the loudspeakers are going to sound. You possibly will not fully understand exactly how the frequency response is measured. I will discuss what specifically this specific term means. Hopefully you will be able to make a much more informed purchasing decision.

A set of cordless speakers are able to only work inside of a specific frequency range. Any signals outside this range will be removed. Therefore the frequency response provides an important hint pertaining to whether a certain set of wireless speakers may be appropriate for a particular use. This range is specified by showing 2 frequencies: a lower as well as upper frequency. As an example, the lower frequency could be 20 Hz and the upper frequency 20 kHz. Using this specification it seems the wireless speakers can work as a set of HIFI speakers. You might think the greater the frequency response the higher quality the wireless speakers. That, however, will not always be the case. You should go through the specifications much more carefully to properly interpret them.

Nevertheless, many manufacturers ignore this established practice. They push the lower frequency and upper frequency to where the cordless loudspeakers rarely have any kind of sound response. In addition, these numbers tell nothing about precisely how linear the wireless speakers are operating within this range. A full frequency response graph, however, will show whether there are any peaks and valleys and also show how the frequency response is to be interpreted. Peaks and also valleys might cause colorization of the sound. If at all possible the sound pressure level of the cordless speakers ought to be linear throughout the entire operating range.

The conditions under which the frequency response was measured are also essential to comprehend. The fact is that numerous amplifiers which are incorporated into the cordless speakers are going to function in a different way with different loudspeaker loads. This is due to the fact that various loudspeaker loads will result in changes to the behavior of the output power stage of the amplifier.

The frequency response of Class-D amplifiers shows the greatest change with different speaker loads because of the built-in lowpass filter which removes switching noise from the speaker amplifier's signal. A varying loudspeaker driver load will affect the filter response to some amount. Commonly the lower the loudspeaker driver impedance the lower the highest frequency of the built-in amplifier. Also, the linearity of the amplifier gain will be determined by the driver load.

Some amps include feedback to be able to compensate for changes in gain caused by different attached loads. Another approach is to provide specific outputs for different loudspeaker driver impedances which are attached to the amplifier power stage via audio transformers.




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