Subwoofer drivers, known as woofers, average between 8" and 15", and can run 34" even. And drivers begin at 4" those under 8" generally don’t reproduce lower frequencies with good quality and usually have higher distortion. Use high-powered amps with subwoofers and an electronic crossover with a low-pass filter. There are two types of subwoofers; those with an amp in the subwoofer cabinet (active), and those without the amplifier (passive). Typically active subwoofers will be clearer and stronger.
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Home Theater.
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With regards to the use of subwoofers in home theater systems, they come mounted in a sealed enclosure. Some people like to focus attention of their systems around satellite speakers, hiding their subwoofer; hence it may be packaged within the system. Others build the subwoofer into the theater cabinet.
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- Why the separation? To keep them out of site, for one thing. Plus for sensitivity issues dealing with the areas’ sound compatibility and mode. Some people prefer to place the subwoofer near the listener.
- Bottom line is, if you want to be able to hear low frequencies, you need a subwoofer. If you don’t care, don’t’ worry about it then.