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Old 18th October 2012, 01:59 AM   #11
NEO Dan is offline NEO Dan  United States
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But these are not horns
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Last edited by NEO Dan; 18th October 2012 at 02:10 AM.
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Old 19th October 2012, 03:40 AM   #12
blossom is offline blossom  New Zealand
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Quote:
Originally Posted by NEO Dan View Post
But these are not horns
I must say I have been following the threads your into and other things are just not as interesting anymore
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Old 19th October 2012, 04:35 AM   #13
blossom is offline blossom  New Zealand
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Just so my comments not taken out of perspective I will clarify. "Not as", as in other things have been catching my eye lately. Theres good reason I'm following this thread, I am interested and enthusiastic about it, theres some nice work being done here. Apologies if I have detracted detracted from you thread Matt.
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Old 19th October 2012, 02:34 PM   #14
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Default Yes this is not a horn

Quote:
Originally Posted by mattlong8 View Post
I started modeling it in sketchup and really became attached to the look of the stacks. Then I did some math and it appeared that the effects I was hoping for would probably be negligible =(. But it still had a unique attractive appearance so I figured I would try it out...my hopes are it won't make things worse.
Dan,
I only referred to the angled configuration with horns to provide more back ground on where my idea's came from. Having stacked speakers like this before got me thinking and I came to some conclusions based on what I think reasonable logic. My comments quoted above are my attempt to put this in to perspective as I wouldn't want others to mistakenly take what I wrote as fact.

So to summarize, I got the idea of the curved baffle/array from angling horns towards each other, I have some thoughts on potential benefits to the sound in this vented design, but in the end it was an aesthetic decision to use it.

I think I was unclear and a bit wordy so I can understand your misinterpretation.

Blossom,
no apologies necessary and thanks for the encouragement. I've spent a long time reading up on this forum (and others) but didn't post much because I felt I should do more research. I have to admit I was a bit intimidated. I finally have something I want to share with the community I learned from, but with 750 views and only a few replies to go off of, I'm not sure what people think. So it's nice to have you show your support.

I'll be starting a full build thread with plans the first week of November. I just wanted to put this up as a bit of a sanity check between my first and second prototypes. So Dan's reply isn't exactly uncalled for, though I was hoping for more like Art's.

Oh and here's a new model:
Click the image to open in full size.
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Old 19th October 2012, 03:29 PM   #15
NEO Dan is offline NEO Dan  United States
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Hi Matt,
It does look good. That is a load of work though. You could build some TH's with less man hours using only 2-4'x8' sheets per box... 8-12's or 4-18's... Do yourself a favor and make the mold for the entire baffle trim to save your sanity and gallons of bondo...
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Old 19th October 2012, 06:10 PM   #16
Xoc1 is offline Xoc1  United Kingdom
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Originally Posted by mattlong8 View Post

The curved baffle came from my thoughts on making a medium-large array out of small cabinets. My concern is that increased low end from clustering would drown out the frequencies near the top of the subs band. One of of balancing this would be to increase the baffle area of the array to increase the directionality of the top end and level the response a bit towards the audience. I thought that perhaps using an arc instead of a plane would give me the area I needed with out increasing the size of the box. So when arrayed the arcs could align by angling adjacent in. This would also reduce the distance between the woofer radiating surface and might add to the coupling of the higher frequencies. I started modeling it in sketchup and really became attached to the look of the stacks. Then I did some math and it appeared that the effects I was hoping for would probably be negligible =(. But it still had a unique attractive appearance so I figured I would try it out.

-Matt
Hi Matt
Curving the array in an inverted arc can widen the radiation pattern at 100Hz.
This reduces the beaming effect compared with a flat array. Maybe that is what you noticed.
Rog Mogale from Void Accoustics has an article on arraying bass cabinets here...
http://www.voidaudio.com//pdf/bass%20guide.pdf
Nice Build
Regards Martin (Xoc1)
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Old 19th October 2012, 10:32 PM   #17
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Default Build decision

Thanks Dan and Martin,
Dan - The purpose of this build was in part to make a small speaker that works well in many situations and also to design and build my first cabinet. While I am pretty ambitious with what I'm trying to tackle, like most beginners are, I opted to gain a bit of experience before tackling a horn design. Rest assured there is one in my future =D.

-Xo Thanks for the link. I had a guild by EV on Bass Arrays but not this one. I love collecting audio pdfs as much as reading them.

-Matt
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Old 24th October 2012, 08:04 PM   #18
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Quote:
Originally Posted by mattlong8 View Post
Thanks Dan and Martin,
Dan - The purpose of this build was in part to make a small speaker that works well in many situations and also to design and build my first cabinet. While I am pretty ambitious with what I'm trying to tackle, like most beginners are, I opted to gain a bit of experience before tackling a horn design. Rest assured there is one in my future =D.
-Matt
Matt,

Don't know how far you have gone in the curved array build, but the Lab 12s make a lot more bass (and way more upper bass) in a tapped horn than in a ported cabinet.

Keystone Sub Using 18,15,&12 Inch Speakers

You could still curve the Keystone fronts if you like that fiberglass smell.

By the way, testing at 2 meters it is not hard to get above traffic noise and get valid tests outdoors, I find my biggest problem for outdoor testing is wind noise, not traffic or the dogs .

Art
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Old 19th November 2012, 11:33 AM   #19
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Default FML

This has gotten ridiculous...
I have put an insane amount time and money into this project and still the second prototype of my speaker isn't done
I didn't go to BAF. I barely spent time at the AES conference, I lost my job(that I hated and was going to quit eventually), I've hardly seen any of my friends or family, and I am in total shock that I am still alive because I'm sure my girlfriend(we live together) has wanted to kill me for a few months now.
Sigh.
I am going to finish and test this speaker tomorrow or die trying. Here's some pics. My attempts to make the fiberglass black kind of suck but oh well. I didn't take the time to resize the pictures so they are probably displayed wrong, but if you click on them hopefully they'll look normal.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
Click the image to open in full size.

-Matt

P.S. I've installed TH-118s in a night club in san francisco and I've used TH-115 extensively. I'm well aware of the benefits of the tapped horn but this if my first speaker I've ever designed and built so I decided to go bass reflex to gain some experience before venturing in to horns. It might save what little sanity I have left if no one else suggests I build a horn. Thanks for understanding.
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Old 19th November 2012, 12:21 PM   #20
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They look great!

definitely an ambitious project... try and keep ahold of your sanity. Once you loose it it can be hard to find again...
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