Ultimate Subwoofer - Page 4 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #31 of 90 Old 12-17-12, 06:21 PM
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A couple thoughts I had:
"Kravchenko Thunder Horn"
or
"Ultimate Front-End Loader Horn" since Mark used a tractor to lift the prototype.
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post #32 of 90 Old 12-17-12, 06:32 PM
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I'm tipping my cards early here...I'm actually getting a label made for mine with the name E.M.P., keeping with my loose matrix theme, and including a nod to kravchenko audio and in my case CSS. But you call it what you want. It does need a name of some sort

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post #33 of 90 Old 12-18-12, 02:33 AM
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Re: Ultimate Subwoofer

I personally like "The Kravchenko." Strong name already.

"Music is the space between the notes"
[T]o talk well and eloquently is a very great art, but that an equally great one is to know the right moment to stop.
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post #34 of 90 Old 01-02-13, 08:00 PM Thread Starter
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Re: Ultimate Subwoofer

So not even a peep from all the builders. Either everything has gone swimmingly or down the drain.

Only time will tell.

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post #35 of 90 Old 01-02-13, 08:50 PM
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Maybe they clamped themselves into a corner? If you're not careful, it's an easy thing to do...

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post #36 of 90 Old 01-02-13, 08:56 PM Thread Starter
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Re: Ultimate Subwoofer

With all that polyurethane adhesive floating around they may have glued their fingers together!

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post #37 of 90 Old 01-03-13, 09:25 AM
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Re: Ultimate Subwoofer

I got my plywood and PL purchased and made the long cuts with my father over Christmas break. He's got a great wood shop and I would have loved to get more done while I was there but couldn't get more than a couple hours away from the rest of my family.

We're back home now and I'll start my build thread this weekend.

Theatre Build:
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post #38 of 90 Old 01-03-13, 09:55 AM Thread Starter
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Re: Ultimate Subwoofer

At least you put first things first. Looking forward to seeing your progress.

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post #39 of 90 Old 01-07-13, 10:25 PM
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Re: Ultimate Subwoofer

Mark

Is there a measurable difference in the output or sound quality of
the original end 'exhaust' build versus the modified side 'exhaust'
build? ...Why or why not? -Thanks.
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post #40 of 90 Old 01-08-13, 06:32 AM Thread Starter
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Re: Ultimate Subwoofer

Quote:
Is there a measurable difference in the output or sound quality of
the original end 'exhaust' build versus the modified side 'exhaust'
build? ...Why or why not? -Thanks.
Sure ask the easy questions.


Well the straight and simple answer is there is no difference. No measurable or audible difference.

The question that follows is why?

Basically in a horn air is being pumped and it is constantly under pressure that is higher than atmospheric pressure until it exits the horn. Compressed air behaves more like a fluid than like air at normal atmospheric pressure. So take this one level further to understand why it makes no difference.

Take an imaginary water tank. Say a 5 gallon bucket, and drill a one inch hole on the bottom. The water will drain out right?

Drill the same size hole on the side close to bottom, and the water will still drain out of the bucket. At the same speed too, as the exit is exactly the same size.

Our horn has the same criteria. Keep the exit area the same on a side or end exhaust and it will "drain" at the same speed.

But says you, what about the sound?

Ok lets get into some waves.

Sound is composed of a multitude of pressure fluctuations that have amplitude ( louder or less loud ) and physical dimension. Take 16 hertz as an example. A half wavelength of 16 hertz is approximately 32 feet. The full wavelength is 64 feet. This is more or less the designed low end of this horn. So pop up and octave or three and see what the wavelength of sound is.

One octave is a doubling or halving of frequency, so here are some numbers:

16 - 32 - 64 - 128

The dashes represent an octave spread. The numbers are the frequency in hertz.

Corresponding half wavelengths are:

32 - 16 - 8 - 4 ( sorry this is in feet )

Full wavelengths are double that so:

64 - 32 - 16 - 8 ( feet )

No one is going to use this horn up to 128 hertz. But say you did. The physical wavelength of 128 hertz, even at the length where a horn can manipulate it's sound with effect ( a quarter of the wavelength ) is still 2 feet. So as long as these conditions are met there will be absolutely no change in output.

The exit area is the same either on the side or the end of the horn. And there is less than two feet difference in the location of the exit.

Keep in mind a horn works on path length so I'm still promoting an exit close to the very end of the horn.

Hope this long winded piece will answer the questions.

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