anyone know the 1/2 wave theory formula?

[basscort2009 5,000+ posts]

i need to figure it out for my next box build. just the formula is fine. maybe the 1.4 wave theory also. i googled it but couldnt find anything realavent

Click to read more...

 

[Upgrayedd 10+ year member]

Not sure if they have it but there is a lot of good info on http://www.mcsquared.com

 

[ciaonzo 5,000+ posts]

Also interested to see this half-wave theory. The energy measured at half a wavelength is 180* out of phase with the origin of the energy so I don't see how it would be beneficial.

Here's some good quarter-wave info.

http://www.quarter-wave.com/

 

[PIITB Wut Wut 10+ year member]

yep 1/4 is what ur lookin for

 

[basscort2009 5,000+ posts]

quarter wave is too low and 3/4 wave is too high for me.

 

[basscort2009 5,000+ posts]

Also interested to see this half-wave theory. The energy measured at half a wavelength is 180* out of phase with the origin of the energy so I don't see how it would be beneficial.
Here's some good quarter-wave info.

http://www.quarter-wave.com/

is it me or can i not find the formulas on that site?

 

[ciaonzo 5,000+ posts]

is it me or can i not find the formulas on that site?

Yep, it's just you. That link is full of other links which then link you to other links.

I have no idea what you're trying to do but if you just want to find the corresponding quarter wavelength for a given frequency it's pretty simple.

25Hz is the static frequency.

1130/25 = 45.2 ft wavelength

45.2/.25 = 11.3 ft = quarter wavelength of 25Hz

11.3*12 = 135 inches = quarter wavelength of 25Hz

Three quarter wavelength is the same thing as quarter wavelength but with more delay from the support of the rear wave. It also means larger physical size to produce the same result.

 

[ciaonzo 5,000+ posts]

quarter wave is too low and 3/4 wave is too high for me.

What exactly are we talking about?

 

[basscort2009 5,000+ posts]

tuning for my next box. tryin to tune it according to my 1/2 wave theory. from the box to the mic point its 7 ft 3 inches. so im tryin to tell what my freq peak is with that in mind.

 

[basscort2009 5,000+ posts]

so do i do 1130/x and then divide that by .5? help me out here. i knew the formula months ago but only used it once and now forgot

 

[basscort2009 5,000+ posts]

come on guys

 

[JimJ 5,000+ posts]

"Half-wave theory"?

WTF?

 

[basscort2009 5,000+ posts]

"Half-wave theory"?
WTF?

ur input is very helpful //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

anyone with some real knowledge wanna chime in?

 

[basscort2009 5,000+ posts]

up

 

[basscort2009 5,000+ posts]

up