Hornresp for Dum... hmm... Everyone ;) - Page 4 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #31 of 67 Old 05-19-11, 09:45 AM
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Re: Hornresp for Dum... hmm... Everyone ;)

If I have a box like the one in this picture, the response of the two woofers MUST be different one to each other, since they are not equally far from the back of the box!

This is the reason for my first question: when I build a box like that, the two woofers close to the back of the box are probably interfering with the two close to the mouth, since they will have not phase coherence.
We know that distances play a big role in tuning and so in FR and phase response of the box (system).

Or am I wrong, and I'm self-making a lot of caos in my brain for nothing?
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post #32 of 67 Old 05-19-11, 09:48 AM
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Re: Hornresp for Dum... hmm... Everyone ;)

Hornresp will automatically add the Sd values together according to the number of drivers that you specify. It will also correct the other driver values.

Any driver within a quarter wavelength of the frequency being reproduced that is beside another driver reproducing the same frequency will act acoustically as one lumped driver. Hornresp models this in the same manner. All the drivers surface areas are summed to become a super driver in surface area and relevant mechanical parameters.

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post #33 of 67 Old 05-19-11, 09:49 AM
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Re: Hornresp for Dum... hmm... Everyone ;)

I am already having troubles to design such boxes, since they must then used inside cars! So after all the HR simulation I'll be involved in real life measuring and tuning, so I want to be as much accurate as possible in first designs steps, and then find a way to include vehicle environment's effects into calculations.

Thanks a lot to everyone who will give his opinion!
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post #34 of 67 Old 05-19-11, 09:51 AM
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Re: Hornresp for Dum... hmm... Everyone ;)

wave length calculator:

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

example 100 hz wavelength = 3,44 meters divide that by 4 to 1/4 you get 0,86 meters as long as your drivers are this close together or closer they act as one driver at this frequency and below.

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post #35 of 67 Old 05-19-11, 09:54 AM
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Re: Hornresp for Dum... hmm... Everyone ;)

I can say this with a great deal of confidence. If you model your box correctly, then build it as you modeled it you will end up with almost exactly what you modeled. I have been using Hornresp for over 6 years and building boxes for just as long. The simulations are very accurate.

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post #36 of 67 Old 05-19-11, 09:57 AM
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Re: Hornresp for Dum... hmm... Everyone ;)

Thanks again, Mark!

The doubt was coming out from building a Transflex subwoofer, where putting two speakers in-line made the response smoother because of in-phase/not-in-phase adding of the second woofer to the first one.
Given that I can model a Transflex easily with HR in TH mode, I was thinking that probably there must be a way to "tell" to the software the distances between the two drivers, and let him calculate the sum of the two emissions at the mouth of the "horn".
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post #37 of 67 Old 05-19-11, 10:02 AM
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Re: Hornresp for Dum... hmm... Everyone ;)

Quote:
mwmkravchenko wrote: View Post
wave length calculator:

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

example 100 hz wavelength = 3,44 meters divide that by 4 to 1/4 you get 0,86 meters as long as your drivers are this close together or closer they act as one driver at this frequency and below.

Mark
I guess that as "distance between speakers" you mean between their axis, right?
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post #38 of 67 Old 05-19-11, 10:03 AM
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Re: Hornresp for Dum... hmm... Everyone ;)

yes

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post #39 of 67 Old 05-19-11, 10:13 AM
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Re: Hornresp for Dum... hmm... Everyone ;)

LAST question (it's a promise) is: have I to use, to calculate L23 in the "quasi 6th order bandpass", the distance from S2 to the middle point between drivers? (I mean between their axis)
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post #40 of 67 Old 05-19-11, 10:17 AM
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Re: Hornresp for Dum... hmm... Everyone ;)

You mean something like this?

Hornresp for Dum... hmm... Everyone ;)-2011-01-20-15.42.17-large-medium-.jpg

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