Active and Passive Subwoofers – Type A (Active) Personalities

Oct 6th, 2009 | By Romantic-Guru | Category: Uncategorized

Video Presentation of my Home Theater

All any home theater (HT) owner needs to do is search the online HT discussion forums to quickly reveal two truths regarding three-dimensional home theater design: first, there are countless “oops” threads where people have made mistakes and boo boos and they want to share their experiences with others in the hopes that they don’t make the same mistakes. And second, unless any home theater owner has literally hundreds of hours to read and research, sift and sort, and spend every available moment for the next 12 months reading through all the discussion threads and trying to take in all the available information, it is probably better to hire a professional to take care of a 3D home theater design. The most important, and most common, question asked is why it is so much better to have a three-dimensional design of a proposed theater space than sticking with the traditional two-dimensional blue print plans.

An active subwoofer is a subwoofer that has its own amplifier. There is no need to use existing receivers or amplifiers. The subwoofer is able to produce its results with its own power. Many home theater owners prefer active subs for a variety of reasons. One reason for choosing an active subwoofer is that bass needs a lot of power to sound as loud and as clean as higher frequencies. Generally, from 100 hertz on down, there needs to be about 10 times the power to move that air at those low frequencies of big wavelength sounds. More power is required of the subwoofer to reproduce a loud and clean sound.

Subwoofers are used in any number of situations and locations, from home theaters and commercial movie theaters to concert halls and large stadiums. The vast majority of the power being used for those applications is produced by the subwoofers because moving that much air for lower frequencies takes a great deal of power. Implementing active subwoofers into the sound system eliminates the unnecessary taxing of the receiver by putting a large power demand on it. The power built into the receiver can take care of the high frequencies, and the low frequencies have their own amplifier.

What many HT designers do is a space analysis, where a model is created of the basic HT space. The space might just be an extra bedroom or a basement. The design begins by building a 3D model of the existing space that includes all the columns, the beams, the duct work, and the pipes. Something as simple as the access to a furnace filter could affect the completed design. As the old expression goes, “The devil is in the details.” The details are really what combine to make a great finished product. Small details that might be missed can really wind up being a problem later when it is too late, or maybe too costly, to correct.

Creating a HT space begins with a thorough understanding of the home for which the space is being designed. Professional designers are able to come up with the best location for the theater based on other parameters that the customer provides. The ultimate goal for both the HT owner and the designer is to make sure that not only is the theater designed properly but that it works in proper conjunction with everything else that is around it

Resource Author Francisco Rodriguez H.
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