Thursday, 11 October 2012

Wireless Surround Sound Models Examined

By Helen Feinstein


You will find various choices out there designed for putting in rear home cinema loudspeakers like directly connecting your speakers to the Audio-video receiver or employing a cordless surround sound kit in order to eradicate the loudspeaker cord mess. Several suppliers are offering wireless speaker sets which can transform just about any kind of speaker into a cordless speaker. The wireless receiver of these products comes with an audio power amp which has to be powered. The power supplies for the cordless receiver must meet certain prerequisites. Within this editorial, I'm going to focus on a few of the most crucial prerequisites.

Both the transmitter and receiver which are part of good-quality home surround sound systems demand power and therefore have to be plugged into a power outlet. Some cordless receiver models possess an integrated power source and attach to a mains electric outlet by way of a cord whilst others have an external wallwart.

Cordless receivers that have an exterior ac adapter do not have to incorporate a power source. As such these may be manufactured considerably more compact. The exterior ac adapter typically is quite small too and often plugs directly into a mains wall socket. Several other kinds hook up to the mains electric outlet by means of a cord. Nearly all of today's laptop computers employ a comparable ac adapter. From the point of view of a designer, combining a wallwart offers some positive aspects over an integrated power supply. Firstly, depending on which country the cordless kit is going to be shipped to, a unique wallwart may be bundled that is compatible with the native mains voltage and electric power connector. Furthermore, individual wallwarts are less costly to have approved regarding safety and also are less expensive to exchange in the event they become faulty as compared to changing the complete receiver. Cordless surround amplifiers with built-in power source are less complicated to put in considering that they directly plug into a mains electric outlet. But, they are typically a bit more bulky.

Next, I'm going to speak about what requirements the power source must meet. Safety factors are key. For that reason, the power source should conform to the safety specifications which apply to each and every nation which the system is offered in. You will find quite a few safety criteria in various nations. But, all of these regulations are made with the safety of the user at heart. One aspect covered in almost all regulations is how well the user is insulated from potential electrical shock. One more factor included in many safety requirements is the behavior of the power source during regular function. You can find requirements regarding how warm the power supply may become and in addition how effectively it will safeguard itself in the eventuality of overload or over-temperature conditions.

A further critical requirement would be that the power source provide ample current to the internal cordless signal receiver and audio amp. The power amplifier is required to drive the loudspeaker which is attached to the wireless receiver. Most power sources for music amps are created to supply a constant current large enough for the amp to meet the RMS rating for 10 minutes prior to overheating. The power source top current specification is usually critical considering that regular music signals possess short peaks of large power. One more requirement is usually that the power supply voltage should really be fairly constant plus have as little ripple and noise as it possibly can. A handful of power amplifiers will compensate for power supply ripple and also noise. For minimal noise, linear power sources are best. This type of power source is utilized in a lot of higher-end sound equipment. Having said that, such a power source may be fairly heavy dependent upon the RMS wattage specification of the wireless receiver. By far a majority of present-day consumer devices utilize switched-mode power sources because of their small dimensions. Often the interior components need various supply voltages. Switched-mode power sources generally offer several supply voltages and also have a number of protection mechanisms such as heat and also overload protection.




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