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Average rating of 5 out of 5 stars
PA Subwoofer
A subwoofer, also known as a low-frequency driver, is a speaker designed specifically for use in PA (Public Address) systems and in combination with speakers that reproduce high frequencies. They are engineered to reproduce low frequencies that are not perceptible for human auditory comfort but are crucial for a complete and powerful sound reproduction of music and other audio materials. They complement the sound image and provide a pleasant, natural playback with the low-frequency range.
PA subwoofers typically have much larger enclosures with correspondingly more massive dimensions and weights compared to other types of speakers and usually have a larger diaphragm surface to accurately reproduce low bass frequencies. They are often used in combination with other types of speakers (tweeters and midrange) to cover a wide sound spectrum and provide a complete sound experience where bass can be not only heard but also felt.
PA subwoofers are frequently used in clubs, bars, concerts, and other events in combination with one or more top speakers to make low frequencies perceptible for listeners. They can also be used for home theater and surround sound systems to provide low frequencies for an immersive sound experience.
What is the difference between an active and passive subwoofer?
The difference between active and passive subwoofers lies in how they are powered. An active subwoofer is equipped with an integrated amplifier (with or without DSP / Digital Signal Processor) that amplifies the frequencies it reproduces. A passive subwoofer, on the other hand, does not have an integrated amplifier and needs to be powered by an external amplifier to function.
An active PA subwoofer is typically more compact and easier to install than a passive subwoofer since it doesn't require an additional amplifier. They are also usually easier to transport as they have fewer components. However, active subwoofers have a higher weight due to the amplifier integrated into the cabinet and are typically more expensive than passive subwoofers.
On the other hand, passive subwoofers require the use of an external amplifier to power them. This can be more complicated as you need to ensure that the amplifier is sufficiently powerful to drive the subwoofer. Passive subwoofers are generally cheaper than active subwoofers and may offer more flexibility in choosing the amplifier. However, they are usually larger and heavier to transport than active subwoofers, although they have a lighter weight.
In general, the choice between active and passive subwoofers is a matter of personal preference and specific requirements. Both options have their pros and cons, and it's important to carefully consider your own needs to make the best choice for the specific application.
How much power (Watt) should a PA subwoofer have?
The power or sound pressure of a subwoofer depends on various factors, such as the size of the room it's used in, the desired volume, and the type of music being played. In general, it's advisable to choose a subwoofer with sufficient power to generate the desired sound pressure in the room.
A rule of thumb is that a subwoofer should have about twice the power coming out of the full-range speakers. So, for example, if speakers with a power of 500 watts (RMS) per box are used, the subwoofer should have a power of about 1000 watts (RMS).
However, this is only a general recommendation, and it's always advisable to consult with a professional and also plan enough safety margins to ensure that the chosen subwoofer is suitable for the intended use or event.
How do I connect a PA subwoofer?
To connect a PA subwoofer, there are some steps you should follow:
Make sure the subwoofer and the PA system are turned on.
Connect the subwoofer cable to the output of the woofer. Usually, this is a cable with a connector that plugs into a socket on the speaker's enclosure.
Connect the other end of the subwoofer cable to the input of the PA system. This could be an input on the back of the mixer or a dedicated subwoofer input.
Ensure that the input on the PA system is set to the subwoofer. Usually, there's an input or channel selection to choose the desired input.
Adjust the level and crossover frequencies on the PA system to amplify or attenuate the subwoofer accordingly.
Turn on the PA system and test the subwoofer by playing music or other audio materials. Make sure the subwoofer is well integrated and reproduces the low frequencies correctly.
The exact steps for connecting the specific PA system and subwoofer (and of course, the top speakers as well) may naturally vary slightly depending on the system. It's therefore advisable to carefully read the user manuals of both devices to ensure that the subwoofer is connected correctly and that all settings (such as frequency response or crossover frequency) are optimized for your needs.