Hello :
I have 8 inch Loud Speakers .
I really like to make a front tractriX Horn and a rear compression box, for this drivers .
I Don´t know nothing about Horn Speakers built.
I don´t know the cutoff frequency for the horn Speaker.
The Raw Drivers parameters are :
Fs: 32.55 Hz
Qts: 0..2256
Qes: 0.2559
Cone Area : 0.0263 m^2
Vas : 78.5 liters or 2.77 cubic feet
Re: 6.4 ohms
BL : 12.29
Rmax 55.87 ohms
Le : 0.9908mH
Efficiency 92.07 dB 1w/1m
For the hi-frequency a Beyma Driver (fs: 970 hz , 9,5BL)
I don´t know the cutoff frequency for the horn Speaker.....
Do you think is a good idea a frontal horn and 600Hz frequency cutoff for the Beyma?
Thank ..
I have 8 inch Loud Speakers .
I really like to make a front tractriX Horn and a rear compression box, for this drivers .
I Don´t know nothing about Horn Speakers built.
I don´t know the cutoff frequency for the horn Speaker.
The Raw Drivers parameters are :
Fs: 32.55 Hz
Qts: 0..2256
Qes: 0.2559
Cone Area : 0.0263 m^2
Vas : 78.5 liters or 2.77 cubic feet
Re: 6.4 ohms
BL : 12.29
Rmax 55.87 ohms
Le : 0.9908mH
Efficiency 92.07 dB 1w/1m
For the hi-frequency a Beyma Driver (fs: 970 hz , 9,5BL)
I don´t know the cutoff frequency for the horn Speaker.....
Do you think is a good idea a frontal horn and 600Hz frequency cutoff for the Beyma?
Thank ..
http://melhuish.org 'single driver website' theres lots of info there.
use hornresp to model response. it isnt so easy but is ok when you know what all the things do.
www.volvotreter.de <tractix horn>
http://hem.passagen.se/sajberrapid
<home made basshorn,midrange horn also>
there is a few links around for hornspeakers and info on them if you look in yahoo.com
use hornresp to model response. it isnt so easy but is ok when you know what all the things do.
www.volvotreter.de <tractix horn>
http://hem.passagen.se/sajberrapid
<home made basshorn,midrange horn also>
there is a few links around for hornspeakers and info on them if you look in yahoo.com
Hi.
Cutoff frequency of front horns means Low cutoff.
In a thin craft manual of Fostex, I found formulae for front horns.
To make it easy to understand, I simulated in place of you.
Setting cutoff at 250Hz, which seems suitable.
Cut off : 250Hz
Sound speed : 34,400 cm/s
Exponential modulus = 4*3.14*250/ 34400 = 0.091
Radius of exit (if it were a round exit) = 2 / 0.091 = 22 cm
Superficies of Exit = 22*22*3.14=1520 scm
If you take 80% of Cone area for Horn�fs entrance, 210.4 scm,
Length of horn = (1 / 0.091)*log (1520 / 210.4) = 21.7 cm
Sectional superficies at each X cm length, scm = 1*exp(0.091*X)*210.4
At first I tried this simulation on Microsoft Excel,
but it was not correct in calculating LOG.
I don�ft know why. Then, I used a scientific calculator.
And you mean Rear compression box for back-loaded horn?
Formula for back-loaded horns is common with frontal one.
It's only to adapt the formula of Sectional superficies.
Length of back-loaded horns; you can set it at your liberty.
(2-3m is supposed to be good.)
Then, simulate until you get suitable numeric.
Formula to calculate the Hi-cut of back-loaded horn;
Cross over frequency(Hz) = 10*So / V
So : superficies of entrance (scm)
V : Volume of compression chamber (litters)
In both front and back horns, its proper entrance superficies
is supposed to be 70-90% of cone area.
In my experience of building back-loaded horns, 80% seems innocuous.
Optimum cross over shifts by which driver you use.
In average back-loaded horns, proper range is 150-200Hz.
But if you reinforce this range by front-horn
or using woofers for the driver, maybe it is better to be lower.
Good luck in your plan!
Cutoff frequency of front horns means Low cutoff.
In a thin craft manual of Fostex, I found formulae for front horns.
To make it easy to understand, I simulated in place of you.
Setting cutoff at 250Hz, which seems suitable.
Cut off : 250Hz
Sound speed : 34,400 cm/s
Exponential modulus = 4*3.14*250/ 34400 = 0.091
Radius of exit (if it were a round exit) = 2 / 0.091 = 22 cm
Superficies of Exit = 22*22*3.14=1520 scm
If you take 80% of Cone area for Horn�fs entrance, 210.4 scm,
Length of horn = (1 / 0.091)*log (1520 / 210.4) = 21.7 cm
Sectional superficies at each X cm length, scm = 1*exp(0.091*X)*210.4
At first I tried this simulation on Microsoft Excel,
but it was not correct in calculating LOG.
I don�ft know why. Then, I used a scientific calculator.
And you mean Rear compression box for back-loaded horn?
Formula for back-loaded horns is common with frontal one.
It's only to adapt the formula of Sectional superficies.
Length of back-loaded horns; you can set it at your liberty.
(2-3m is supposed to be good.)
Then, simulate until you get suitable numeric.
Formula to calculate the Hi-cut of back-loaded horn;
Cross over frequency(Hz) = 10*So / V
So : superficies of entrance (scm)
V : Volume of compression chamber (litters)
In both front and back horns, its proper entrance superficies
is supposed to be 70-90% of cone area.
In my experience of building back-loaded horns, 80% seems innocuous.
Optimum cross over shifts by which driver you use.
In average back-loaded horns, proper range is 150-200Hz.
But if you reinforce this range by front-horn
or using woofers for the driver, maybe it is better to be lower.
Good luck in your plan!
Hello :
This Pictures are the SPL response for 8 inch woofer made by hornresp Software ( thankX mikee12345 for the information )
The first picture:
Is Cutoff frequency 200 HZ , Internal TractriX Horn area 100 , external TractriX Horn area 2354,21 , angle 90°, Rear compression Chamber volume 2.8 liters.
The second picture:
Is Cutoff frequency 600 HZ , Internal TractriX Horn area 23,58 , external TractriX Horn area 249,68, angle 90°, Rear compression Chamber volume 15 liters.
Cutoff frequency of front horns means Low cutoff and 2-3m is supposed to be good for rear chamber (thankX Odio Yayakoshi )
I really like 200Hz for the Horn Speakers.
If I was typing the correct data in the Software parameters, the second picture looks like better and works more frequency than 200HZ simulation.
I like to Know what picture is not correct ...
I mean I want the better performance for the 8inch driver.
ThankX
AdvisD
This Pictures are the SPL response for 8 inch woofer made by hornresp Software ( thankX mikee12345 for the information )
The first picture:
Is Cutoff frequency 200 HZ , Internal TractriX Horn area 100 , external TractriX Horn area 2354,21 , angle 90°, Rear compression Chamber volume 2.8 liters.
The second picture:
Is Cutoff frequency 600 HZ , Internal TractriX Horn area 23,58 , external TractriX Horn area 249,68, angle 90°, Rear compression Chamber volume 15 liters.
Cutoff frequency of front horns means Low cutoff and 2-3m is supposed to be good for rear chamber (thankX Odio Yayakoshi )
I really like 200Hz for the Horn Speakers.
If I was typing the correct data in the Software parameters, the second picture looks like better and works more frequency than 200HZ simulation.
I like to Know what picture is not correct ...
I mean I want the better performance for the 8inch driver.
ThankX
AdvisD
Attachments
The Hornresp SPL-response pictures are from 8 inch Loud Speakers previous simulation.
For this designs, I changed this 8 inch driver and assembly 18 inch woofer in a ported gabinet
In the last pictures Beyma Sm118 woofer
Beyma CM-250 driver , 650 Hz Tractrix Horn.
The small round Tractrix Horn, normal dome tweeter installed.
Daniel.
For this designs, I changed this 8 inch driver and assembly 18 inch woofer in a ported gabinet
In the last pictures Beyma Sm118 woofer
Beyma CM-250 driver , 650 Hz Tractrix Horn.
The small round Tractrix Horn, normal dome tweeter installed.
Daniel.
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