Acoustics

Speaker: Sub-Woofer

The Music Telegraph | Text 2019/06/21 [14:00]
Acoustics

Speaker: Sub-Woofer

The Music Telegraph| 입력 : 2019/06/21 [14:00]

▲ SVS SB-2000 Subwoofer

© HomeTheaterReview.com

 

 

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.

 

▲ Subwoofer (20 Hz ~ 99 Hz)



▲ Woofer (40 Hz ~ 500 Hz)



▲ Mid-Range Speaker (250 Hz ~ 1000 Hz)  



▲ Tweeter (2 kHz ~ 20 kHz)    



- 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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