# Sub woofers and tweeters wavelength

• Istfan
In summary, when buying a home cinema system, the subwoofer can be placed anywhere due to its omni-directional sound. However, the tweeters must be placed accurately at ear level to ensure the room is filled with wavelengths. This is because the long wavelengths of bass frequencies can diffract around corners and posts, while the short wavelengths of high frequencies are more directional and cannot bend around obstacles. This is why tweeters must be placed accurately for optimal sound quality.
Istfan
1. question

2.hello Dear ,

I have a question for you please ,
When you buy a home cinema system, you can place the subwoofer almost anywhere, even behind your couch.
But the tweeters (speaker for high frequencies) must be placed very accurately. Explain why!
Hint: use wavelengths for explanation (yes, with numbers). Give a strong argument.It is all about the size of wavelengthes. Think again back to the camera obscura.

## The Attempt at a Solution

speed of sound at sea level Cs = 340.29 m / s
is a constant

Cs = λ / T

Cs = λ (wavelength) . v (frequency)

With high frequencies like tweeters , we will get lower λ (wavelength)

For example of Frequency of 150 HZ sound wave (for sub woofers 20-200 Hz) .
The λ (wavelength) = 340.29 / 150= 2.2686 m

With 5000 Hz (tweeters have frequency between 2000-20000 Hz)

The λ (wavelength) = 340.29 / 10000 = 0.034029 m =3.4029 cm

The long wavelength sounds (lower frequencies) of the Subwoofer will diffract around the corners of the room more efficiently than the more directional, short wavelength sounds of the tweeters. So that we can put the subwoofer anywhere but the tweeters are directional . Since the bass frequencies have longer wavelengths, they will spread out more than the high frequencies. The high frequency sound spreads out less than the low frequency sound.

And for the Bass of Subwoofer it is called low-frequency, high-amplitude sound waves. So
lower-frequency = higher- λ (wavelength)

Higher λ (wavelength) = Higher T(Time duration needed)

Co (speed) = distance / Time

So ..
Higher T = higher distance

So , subwoofer can be put anywhere as its sound is omni-directional. The very long wavelength of the very low frequency bass sounds reproduced by the subwoofer usually makes it impossible for the listener to localize the source of these sounds . Because of long wavelength there is little difference between the information reaching a listener's left and right ears, and so they cannot be readily localized , so location does not matter .

But tweeters with high-frequencies have lower wavelength .

Lower-wavelength need lower time to move the distance

So lower time = lower distance

Than tweeters can be readly localized with short wavelengths and no difference between information reached to ears.
So we should put the tweeters accurately in place inline with ear level so all the room will be of wavelengths !

IS IT RIGHT ? :)

a correction .. or addition :

The long wavelength sounds (lower frequencies) of the Subwoofer will diffract around the corners of the room more efficiently than the more directional, short wavelength sounds of the tweeters. So that we can put the subwoofer anywhere but the tweeters are directional . Since the bass frequencies have longer wavelengths, they will spread out more than the high frequencies because wavelength are long enough to bend around posts and corners. The high frequency sound spreads out less than the low frequency sound because short wavelength are not able to bend around corners and posts so they are more directional.

Anybody is here ?>?

## 1. What is the purpose of a sub woofer and a tweeter?

A sub woofer is a type of speaker designed to produce low frequency sounds, while a tweeter is designed to produce high frequency sounds. Together, they create a full range of sound for a more immersive listening experience.

## 2. How do sub woofers and tweeters produce sound at different wavelengths?

Sub woofers produce sound at longer wavelengths due to their larger size and slower vibrations, while tweeters produce sound at shorter wavelengths due to their smaller size and faster vibrations.

## 3. Why is it important to match the sub woofer and tweeter wavelengths?

If the sub woofer and tweeter wavelengths are not matched properly, there can be a gap in the frequency range which may result in uneven or distorted sound quality.

## 4. Can sub woofers and tweeters be used in any type of audio system?

Yes, sub woofers and tweeters can be used in a variety of audio systems, such as home theater systems, car audio systems, and professional sound systems.

## 5. Are there any special considerations when installing sub woofers and tweeters in a sound system?

Yes, it is important to consider the placement and positioning of the sub woofer and tweeter to achieve optimal sound quality. Also, proper wiring and compatibility with the audio system should be taken into account.

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