Home Theater Sub Woofers - By: S. Boyd

Subwoofers are becoming much more crucial to the home theater experience. When you visit your local theatre, you marvel not simply at the images projected on the cinema screen, but also the sounds emanating all around you. What really grabs you, though, certainly is the sound most people feel; the deeper bass that rumbles you up and gets you in the middle of your gut.
A customized speaker, known as a bass speaker, is mainly responsible for this experience. The subwoofer is manufactured just to reproduce the lowest of audible frequencies.

Passive Sub woofers
Passive subwoofers are energized by an external amplifier, in the same fashion as alternative speakers in your system. The top consideration at this point is that since extreme bass needs more power to reproduce low frequency sounds, your amplifier or receiver has to be competent to output enough power to sustain bass effects within the subwoofer without draining the amp. Just how much power relies on what's needed with the speaker and also the size of the space (and how much bass you could stomach!).

Powered Subwoofers
To eliminate the circumstance of limited power or other characteristics which may be lacking in a amplifier or receiver, powered sub woofers are self contained speaker/amplifier units while the characteristics belonging to the amplifier and sub woofer are optimally matched.
For a side benefit, all a powered bass speaker needs is known as a line output from your receiver. This arrangement requires a large amount of the energy load out of the amp/receiver and enables the amp/receiver to power the mid-range and tweeters with less difficulty.

Front-Firing and Down-Firing Bass speakers
Front firing sub woofers make use of a speaker mounted in order that it radiates the audio within the side or front of the sub woofer enclosure.
Down-firing subwoofers make use of a speaker that's mounted in order that it radiates downward, towards the floor.

Ports and Passive Radiators
Some subwoofer enclosures also have a second port, which blows out more air, enhancing bass response from a more efficient manner than enclosed enclosures. Another type of enclosure runs on the Passive Radiator in addition to the speaker, instead of a port, to improve preciseness and efficiency. Passive radiators may either be speakers having the voice coil removed, or else a flat diaphragm.

Cross-overs
The crossover is often an electronic circuit that channels all frequencies below a particular point to the sub woofer; all frequencies above that point are duplicated to the main, middle, and surrounding speakers. Typically, a great bass speaker incorporates a "crossover" frequency close to one hundred hertz. Gone is the requirement for those large 3 way speaker systems with 12 or 15 inch woofers. Smaller sized satellite speakers, optimized for mid-to-high frequencies, that use up a lesser amount of space and are now common in numerous home cinema systems.

Deep Bass is Non-Directional
In addition to that, ever since the deep bass frequencies reproduced from the subwoofers are non-directional (as frequencies that are at or below the threshold of hearing). It is extremely difficult for our ears to successfully pin-point the direction in which the sound is coming from. That's why we are able to only sense that an earthquake seems to be all around us, rather from coming from a particular direction.

Sub woofer Placement
As a result of the non-directional sound that is reproduced by way of the sub woofer, it could be placed any where in your room. However, the best possible results rely upon size of the room, wall construction, floor type and furnishings. Typically, best placement for a sub woofer is by the front of your room, simply to the left or right of the main speakers, or even in a front corner of the room.

The Results
Despite the many technical features and design factors of sub woofers, the type of subwoofer you select for your system depends upon the characteristics of the room along with your own preferences.

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