wave lengths - Home Theater Forum and Systems - HomeTheaterShack.com

Old 06-21-12, 04:39 PM Thread Starter
Shackster

guy45

Join Date: Jun 2012
Location: sydney australia
Posts: 8
wave lengths

can any one tell me the distens of a 20hz and a 30 hz wavelength acuratly in metric if possabal
guy.s.w is offline

Old 06-21-12, 05:25 PM
Senior Shackster

Join Date: Aug 2010
Location: Torrance, CA
Posts: 591
My System
Re: wave lengths

http://www.mcsquared.com/wavelength.htm

XBox Live ID: Atomic Hamper
Old 06-21-12, 06:59 PM Thread Starter
Shackster

guy45

Join Date: Jun 2012
Location: sydney australia
Posts: 8
Re: wave lengths

its not acurat but thanks 30 hz shald be about 3 meters the calculater said 11. somthing corect me if im wrong
guy.s.w is offline
Old 06-21-12, 07:04 PM
Senior Shackster

Join Date: Aug 2010
Location: Torrance, CA
Posts: 591
My System
Re: wave lengths

Speed of sound at sea level is 340.29 m/s, so

340.29 / 20 = 17.01 m
340.29 / 30 = 11.34 m

(calculator says 17.2, 11.47 - so I guess their speed of sound is slightly different)

Maybe you're thinking of quarter wavelength?

XBox Live ID: Atomic Hamper
Old 06-21-12, 07:35 PM
Elite Shackster
Kal

Join Date: Aug 2006
Location: NYC + CT
Posts: 1,745
Re: wave lengths

Quote:
(calculator says 17.2, 11.47 - so I guess their speed of sound is slightly different)
Yup. Varies with air pressure and temperature.

Kal Rubinson
__________________________________
"Music in the Round"
Senior Contributing Editor, Stereophile
Kal Rubinson is offline
Old 06-21-12, 09:56 PM
Senior Shackster

Join Date: Aug 2010
Posts: 487
I understand the physics behind measuring the distance of one wavelength, I've just never heard a good explanation of why I should care. The driver moves in and out compressing and rareifying the air in front of it. What difference does it make how far the first pressure peak is from the driver when the next peak occurs? Thanks for the answer that will open my eyes to the wonders of acoustic phenomenon.

++++++++++++++++++++++++++++++++++++++++
People think I'm strange, does it make me a stranger?
phreak is offline
Old 06-22-12, 06:27 AM
New Member
Sophia321

Join Date: Jun 2012
Posts: 2
Re: wave lengths

Sound energy is divided into frequencies. Each frequency has a given size or length. The speed of sound, 1130 ft./sec., stays constant and is used to calculate the length of a particular frequency. To find the length of a given frequency, we take the speed of sound, 1130 ft./sec. and divide it by the specific frequency we want to find the length of. If we use 20 Hz. as our frequency, we take the speed of sound 1130 ft./sec. and divide it by 20. Our answer is 56.5 ft.
Sophia321 is offline

 Bookmarks

 Tags lengths , wave

Message:
Options

## Register Now

Random Question
Random Question #2

User Name:
OR

## Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.