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Speaker: Sub-Woofer
- In general, the frequency range that speakers can generate is various depend on the type of the speaker. - The audible frequency that healthy people who have no problem with hearing is 20 Hz ~ 20 kHz. - Speakers are classified as Subwoofer, Woofer, Mid-Range Speaker, and Twitter by use. - The range of 40 Hz ~ 500 Hz for Woofer, 250 ~ 1000 Hz for Mid-Range Speaker, 2 kHz ~ 20 kHz for Twitter. - The Subwoofer to be dealt with here has the range of 20 Hz ~ 99 Hz, which is below 100 Hz, and is mainly attached to the home theater system.
- There are 2 types of Subwoofers: Passive type and Active type. - Passive type Subwoofers are often used in low-cost home theater systems and the performance of the passive type is generally lower than that of the active type. - The active type is mostly used in high-end system and is equipped with a dedicated amplifier in the backside.
- There are three types of Subwoofer unit installation: Front-Mounted, Side-Mounted, and Down-firing. - However, because Subwoofer is omnidirectional, it is difficult to distinguish where the unit is located, unless you listen closely. Therefore, there is no big difference in unit location.
- The subwoofer is responsible for the sound below the minimum value of 100 Hz and this sound is omnidirectional (bass without direction). - Therefore, the Subwoofer can be installed anywhere, unlike a regular speaker with a fixed installation position and listening angle. - However, depending on the location, resonance may occur: When installed in the corner, the bass sound is amplified and turned into a roar, rather than a warm bass sound. - In addition, the Subwoofer has the possibility of causing noise and vibration when the anti-vibration device is not installed because it causes tremendous vibration and resonance to reproduce low-end sound. - Marble, rubber pads, spikes, rubber balls, etc. are available as anti-vibration devices.
*The tuning method of the Subwoofer is as follows: 1) Adjust the LPF (Low Pass Filter) appropriately 2) The level should be 10 dB higher than the level of the mid tone 3) Adjust with the human audition
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