Powered Amplifier
Why Do I need a Karoake Amplifier?
A karaoke amplifier is just like all other amplifiers, but it designed especially for karaoke and karaoke machines. While an amplifier can be designed for home use, most are for karaoke DJs. An amplifier for a karaoke machine makes it easy to setup and take down a karaoke setup and you get more features than a traditional PA system.
These are all features that any karaoke DJ would love. Karaoke amplifiers are also commonly referred to as hybrids because they have the features that are also found on many pre-amps.
One feature is the ability to send audio signals from more than once source; this is due to the multiple inputs. If you have two audio sources, like an MP3 Player and a karaoke machine, there is no longer a needed for a mixer. Many of these units also include a radio tuner.
A standard karaoke amplifier should have enough power to efficiently run four speakers. As the general rule of thumb, a good setup includes two main speakers, a monitor speaker, and a subwoofer. The main speaker and subwoofer work together to get all of the sound out to the audience.
The monitor speaker is there so the singer can hear themselves. The best karaoke amplifiers have a built-in crossover, which means that the low frequencies from the subwoofer will only go through that subwoofer; this helps to keep them separate from the mix. For the best results, run the main speakers and the monitor on the same channel because the higher frequencies do not need too much power.
In terms of watts, your amplifier must be matched to your speakers and so forth. It doesn’t need to be by much, but the speakers must be able to handle more power than an amplifier can put out. For example, a 400 or 450 watt speaker is needed for an amplifier that can put out a total of 300 watts.
On the other hand, a speaker would need to handle around 1,000 watts if the amplifier could put out 800 watts. But, when running that many watts, it is likely that you are using multiple speakers. If so, you can total the wattage from each speaker and add them together to determine exactly how much they can handle as a pair. With eight hundred watts, you could run two five hundred watt (or even four hundred and fifty) speakers, or four two to three hundred watt speakers.
Keep these figures in mind when buying a subwoofer because you don’t want to run a 1,500 watt subwoofer on a 300 watt amplifier. By doing so, you could burn out the amplifier and not get good sound quality because it needs more power than it is currently getting.
Multiband Power Amplifier NTT DoCoMo R&D : DigInfo
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