Subwoofers are becoming even more important to the home theatre experience. When you visit your local theatre, you marvel not only at the images projected on the cinema screen, but the sounds emanating near you. What really grabs you, though, is definitely the sound most people feel; the heavy bass that shakes you up and gets you in the middle of your gut. A specialty speaker, known as a subwoofer, enhances this experience. The sub woofer is manufactured just to reproduce the lowest of audible frequencies.
Passive Subwoofers Passive subwoofers are powered by an external amplifier, within the same fashion as alternative speakers in your system. The top consideration here is that since extreme bass needs more electricity to reproduce low frequency sounds, your amplifier or receiver really should be capable to output enough power to sustain bass effects in the subwoofer with out draining the amp. Just how much power is dependent upon the needs from the speaker as well as the size of the space (and just how much bass you could stomach!).
Powered Sub woofers To resolve the dilemma of inadequate energy or other characteristics that may be missing in a receiver or amplifier, powered subwoofers are self-contained speaker/amplifier units while the characteristics of the amplifier and sub woofer are optimally synchronised. As a side benefit, all a powered subwoofer needs is definitely a line output coming from a receiver. This arrangement takes a large amount of the power load out of the amp/receiver and allows the amp/receiver to power the mid range and tweeters with less difficulty.
Front-Firing and Down-Firing Sub Woofers Front-firing sub woofers contain a speaker mounted so that it radiates the audio from the side or front of the bass speaker enclosure. Down firing sub woofers utilize a speaker which is mounted so that it radiates downward, towards the floor.
Ports and Passive Radiators Some sub woofer enclosures also employ an extra port, which forces out quite a bit of air, maximizing bass response in a more efficient manner than sealed enclosures. Yet another kind of enclosure runs on the Passive Radiator along with the speaker, rather than a port, to increase preciseness and efficiency. Passive radiators can either be speakers having the voice coil removed, or else a flat diaphragm.
Crossovers The crossover is often an electronic circuit that tracks all frequencies below a specific point to the bass speaker; all frequencies above that point are duplicated to the main, centre, and surrounding speakers. Typically, a good subwoofer incorporates a “cross-over” frequency close to 100hz. Gone is the requirement for those large 3-Way speaker systems with 12″ or 15″ woofers. Smaller satellite speakers, optimized for mid-to-high frequencies, that occupy significantly less space and therefore are now common in numerous home theater systems.
Deep Bass is Non Directional In addition to that, while the deep bass frequencies reproduced by way of the sub woofers are non-directional (as frequencies that are at or below the threshold of hearing). It’s very hard for our ears to actually pin-point the direction in which the sound is originating from. That’s the reason we are able to only sense that an earthquake seems to be all around us, rather from from a particular direction.
Subwoofer Placement Caused by the non-directional sound that is reproduced by the subwoofer, it can be placed anywhere in your room. However, the best results rely upon room size, furnishings, wall construction and floor type. Typically, best placement for a subwoofer is by the front of the room, simply to the left or right of the main speakers, or in a front corner of the room.
In Conclusion Despite the many technical features and design components of subwoofers, the type of bass speaker you ultimately choose for your personal system relies on the characteristics of your room and your own preferences.
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