Horn Sub Input Please - Build In Progress! - Page 5 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #41 of 261 Old 03-27-13, 09:00 PM
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re: Horn Sub Input Please - Build In Progress!

Stayner is only five hours away.

I might be able to hear your system from my place!

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post #42 of 261 Old 03-27-13, 09:04 PM Thread Starter
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re: Horn Sub Input Please - Build In Progress!

Ha yeah there is the possibility that you will. Don't you think the driver modled pretty good? I have tried a bunch of different drivers, and some are way off, and some are very close to what I have. I would hate to have to re model and re fold again...
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post #43 of 261 Old 03-27-13, 09:18 PM
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re: Horn Sub Input Please - Build In Progress!

Take the driver I suggested.

Slap it into your horn. You will be able to do two things. Shrink the rear chamber, and if you have ripple take a look at how much ripple. An undulation of 3 db up or down is not really noticeable.

Also if you buy eight or more of the Dayton Pro woofers you will get a discount.

The Selenium driver has very little excursion capability and therefore will have much higher distortion in a horn.

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post #44 of 261 Old 03-27-13, 09:24 PM Thread Starter
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re: Horn Sub Input Please - Build In Progress!

Im sorry but I have modeled that driver already, and the selenium was better resposonse wise, the driver you are suggesting is 1.5mm more Xmax, and I will be driving my design no where near 3.5mm anyhow, not sure why this will warrent a complete redesign.

Earlier you said the graphs looked good. Confused...
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post #45 of 261 Old 03-27-13, 09:30 PM
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re: Horn Sub Input Please - Build In Progress!

Graphs are one part of the design.

When you need a rear volume of 140 liters on a back loaded horn you have a driver that is not suited to horn loading.

Your choice. This is advice not a dictatorship.

I chimed in because I have been designing horns for the past twenty years, and I work as a consultant in driver and loudspeaker design.

There is an existing design up on this forum that meets almost all that you seek. And it is proven.

So this is not advice from someone who has simmed only.

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post #46 of 261 Old 03-27-13, 09:38 PM Thread Starter
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re: Horn Sub Input Please - Build In Progress!

No insult meant, simply trying to understand. The sims looked okay with that driver down to around 70L rear chamber volume, but I knew I had the additional space, so I increased the size, which also reduced the ripple in hornresp.

I do know that sims are not the end all be all, but can you please enlighten me on how the dimensions of a sealed enclouser affects the driver, and why such a large volume is bad if you have room?

Thanks.
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post #47 of 261 Old 03-27-13, 09:43 PM
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re: Horn Sub Input Please - Build In Progress!

Short story is a long day and a short fuse.

I'll give you a good explanation in the morning.

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post #48 of 261 Old 03-28-13, 11:09 AM
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re: Horn Sub Input Please - Build In Progress!

A horn is a balancing act of motor strength versus the compression wave you want to force down the horn path. The stronger the motor the better the control over the way the cone moves. A proper horn is a very hostile environment for a woofer compared to a vented box or a sealed box. There is quite a bit of pressure generated on the cone. The rear chamber should be sized in such a manner that it provides a restorative force to the driver. A balance of pressure. The very large Chambers you propose will have very little of any spring or restorative force to keep the driver in check. The front of the driver will see a high pressure whereas the back will not. A great invitation to nonlinear behavior. That's a fancy word for distortion.

The Selenium driver has two strikes against it. Weak motor and a very short voice cool. Not a good combination for a horn.

Even though there is an approximately four to one reduction on the excursion versus sound pressure level musical impacts, and movie effects will ask your drivers to shift some serious air.

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post #49 of 261 Old 03-28-13, 11:34 AM Thread Starter
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re: Horn Sub Input Please - Build In Progress!

Here is a quick sim of the Dayton 12" you recommended. With a 70L rear chamber, is this more acceptable?

Thanks for your input so far!
Attached Thumbnails
Horn Sub Input Please - Build In Progress!-dayton12.jpg  

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post #50 of 261 Old 03-28-13, 12:20 PM
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re: Horn Sub Input Please - Build In Progress!

I just want to thank you guys for your excellent Q & A session! I'm sure that others are following along and share my thoughts as well.


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