ProSoundWeb Community

Please login or register.

Login with username, password and session length
Advanced search  

Pages: [1]   Go Down

Author Topic: mutual coupling tk  (Read 883 times)

tkroeker

  • Guest
mutual coupling tk
« on: September 30, 2016, 01:42:19 pm »

So one piece I'm missing is this.
when two speakers couple, is it at Hz above or below the 1/2 wavelength?

i.e. ( roughly)
two 18's
80 Hz = 14 feet
1/2 wavelength = 7 feet

if the two 18's are under 7 feet apart will they couple 80 to 500,, or 80 down 
Logged

Mac Kerr

  • Old enough to know better
  • Administrator
  • Hero Member
  • *****
  • Offline Offline
  • Posts: 5723
  • Audio Plumber
Re: mutual coupling tk
« Reply #1 on: September 30, 2016, 01:50:04 pm »

So one piece I'm missing is this.
when two speakers couple, is it at Hz above or below the 1/2 wavelength?

i.e. ( roughly)
two 18's
80 Hz = 14 feet
1/2 wavelength = 7 feet

if the two 18's are under 7 feet apart will they couple 80 to 500,, or 80 down

They stop canceling and begin to couple at frequencies whose 1/4 wavelength is larger than the driver spacing. You get summation over a 1/2 wavelength range, but it is plus/minus 1/4 wave around zero phase offset. Since there is no minus offset involved in driver spacing it is only 1/4 wavelength, a 1/4 wavelength being 90 of phase offset.

Mac
Logged

Ivan Beaver

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 8241
  • Atlanta GA
Re: mutual coupling tk
« Reply #2 on: September 30, 2016, 05:09:09 pm »



if the two 18's are under 7 feet apart will they couple 80 to 500,, or 80 down
They couple as the freq goes LOWER. 

The spacing is the UPPER limit.

Because as the freq goes lower, the wavelengths get longer, so they get "acoustically closer" as the freq goes down.
Logged
A complex question is easily answered by a simple-easy to understand WRONG answer!

Ivan Beaver
Danley Sound Labs

PHYSICS- NOT FADS!

tkroeker

  • Guest
Re: mutual coupling tk
« Reply #3 on: September 30, 2016, 05:16:08 pm »

They couple as the freq goes LOWER. 

The spacing is the UPPER limit.

Because as the freq goes lower, the wavelengths get longer, so they get "acoustically closer" as the freq goes down.

awesome thanks
Logged
Pages: [1]   Go Up
 


Page created in 0.08 seconds with 22 queries.