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

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post #1 of 261 Old 03-21-13, 05:17 PM Thread Starter
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Horn Sub Input Please - Build In Progress!

I am in the process of layout/design of my new theater room. I am going to be using PI 4 Speakers for LCR, and PI 1 Speakers for Surrounds. I designed a set of OD Horn Speakers to compliment the LCR and surround speakers as flanking subs to tame room modes. So the frequency range is 50-200hz

Since this is my 1st attempt at Hornresp and Sketchup, I am looking for input on my design and folding before proceeding further. So there will be 7 total of these flanking subs the front 3 will be under the PI 4's and the 4rears will be under the surrounds in a column configuration. The will be driven with 20 watts RMS.

I will be using a miniDSP 10x10hd, and the plan is to cross the flanking subs, with there respective mains, as well as matrix the LFE channel to theses subs as well for frequencies above 50hz, and then use the Low LFE subs for everything under 50-60hz.


Thanks!!

Last edited by fireanimal; 05-27-13 at 12:34 PM.
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post #2 of 261 Old 03-23-13, 09:15 AM
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re: Horn Sub Input Please - Build In Progress!

Sorry for the delayed response.

I am new to horns and keep learning everyday. From what I have learned changing length and geometry will cause changes in your impulse and phase. Usually wanting close to a 90 degree phase shift in useable BW in a horn is what you are looking for with a 1 to -1 impulse response. SO that means you can have a 0 - 90 or +45 (-) -45 phase shift.

I have not had a chance to look at your design yet. I am currently building a cinema TH and will be building a 30hz TH soon.

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[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 #3 of 261 Old 03-23-13, 12:52 PM Thread Starter
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re: Horn Sub Input Please - Build In Progress!

Thanks for the response. I actually changed drivers and re designed the Front LFE subs. Here is a picture of the 1 watt SPL response, and a picture of the folding.

I am still also designing a rear sub, which will be under the seating riser, and will cover down to 10hz.
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Horn Sub Input Please - Build In Progress!-splresponse-small-.jpg  

Horn Sub Input Please - Build In Progress!-frontlfesub.jpg  

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post #4 of 261 Old 03-23-13, 07:38 PM
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re: Horn Sub Input Please - Build In Progress!

I am horrible at trying to fold but it seems like a waste of space in your TH the center section. What is your L34?

How large is this design and what drivers are you using?(dual 12's)

I have seen so many TH designs that this reminds me of the dual Type R alpine 12" TH. What are you trying to reach with this horn extension wise?

There are a few designs out there that are designed around 16hz and play down to 12 just fine. I am building a TH now that is 4ft x 3ft x 2ft. It need a Hpass at 17/18hz but does everything up from there extremely well.

"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 #5 of 261 Old 03-23-13, 09:07 PM Thread Starter
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re: Horn Sub Input Please - Build In Progress!

The response is around 15hz @ 102 db 1w/1m. The goal was good sensitivity, and good extension, I will be building a pair of the subs, and the will be placed between my main speakers behind my screen. They will blend in with a larger horn sub that will be built into the seating riser, which will be tuned to 10-11hz.

The overall size of the enclosure is 60cmX73cmX182cm, the drivers are dual 10" subs. It may look like alot of space, but actually I would only gain around 20cm of length if I redisgned and redrew it, which imho is not worth the effort, it fits the space I need it to, and has the response and extension that I was expecting.
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post #6 of 261 Old 03-24-13, 02:32 PM
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re: Horn Sub Input Please - Build In Progress!

Wow, over 100db below 20hz at one watt?! Subscribing to follow your progress!
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post #7 of 261 Old 03-24-13, 03:11 PM Thread Starter
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re: Horn Sub Input Please - Build In Progress!

That is corner loaded sensitivity though. Hope it responds as well when its built.
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post #8 of 261 Old 03-25-13, 05:50 PM Thread Starter
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re: Horn Sub Input Please - Build In Progress!

I have redone my Flanking Subs, using a Delta 10A driver, found it smoother, and fit into a slightly smaller package. Should work good I think!
Attached Thumbnails
Horn Sub Input Please - Build In Progress!-flankingsub.jpg  

Horn Sub Input Please - Build In Progress!-flankresponse.jpg  

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post #9 of 261 Old 03-25-13, 06:31 PM
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re: Horn Sub Input Please - Build In Progress!

So FLH for the flanking subs and TH for the ULF sub?

How high are you going to use these flanking subs?

Your design looks good to about 400hz.

"Music is the space between the notes"
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post #10 of 261 Old 03-25-13, 10:07 PM Thread Starter
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re: Horn Sub Input Please - Build In Progress!

Yes, flanking subs will be used for 50-200hz+- depending on room modes, ULF tappered horns for <50hz. Trying a distributed sub setup to help room modes and elimanate or reduce use of PEQ filters.
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