Tall, thin tapped horn possible? - AVS Forum
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post #1 of 18 Old 06-19-2013, 06:12 AM - Thread Starter
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I'm considering building a tapped horn subwoofer. I've been reading through all of the various projects trying to find a suitable build (aka- one that the wife won't throw me out of the house for putting in the living room wink.gif). Can a tapped horn be made in a tall, slim form factor? I think something about 16" x 10" x 60" would look pretty nice. I know that the driver size would have to be limited (like an 8") to even fit, but could a modestly effective sub be built to these dims?
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post #2 of 18 Old 06-19-2013, 07:02 AM
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That's a really small depth to try and accommodate all the turns needed. I think there's some plans out there for a TH with a single fold though that might be close to what you are looking for. I think it was something Deon (db-kicker) was working on when he was doing thehousewrecker- the chances of you getting the plans are slim though unless someone already had em, because Deon is dead now.
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post #3 of 18 Old 06-19-2013, 09:46 AM
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Quote:
Originally Posted by stormwind13 View Post

That's a really small depth to try and accommodate all the turns needed. I think there's some plans out there for a TH with a single fold though that might be close to what you are looking for. I think it was something Deon (db-kicker) was working on when he was doing thehousewrecker- the chances of you getting the plans are slim though unless someone already had em, because Deon is dead now.

That's plenty of room for a small tapped horn. I'd suggest a few inches wider (12") so that you could load it with a 10 instead of an 8. There are a lot of questions that need to be answered before I can recommend a driver or design.

As far as the housewrecker plans? I'm the guy that drew em. That project certainly didn't die with Deon.

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post #4 of 18 Old 06-19-2013, 10:45 AM
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Ok, I figured as much but didn't know for sure. I just remember seeing a single fold super tall HW variant in that thread somewhere.
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post #5 of 18 Old 06-19-2013, 11:23 AM - Thread Starter
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lilmike- I'm considering building your T-6, but I'm thinking that something taller and thinner would look nicer in my living room. A tall black monolith might look pretty classy. I'm not looking for monster output; just something with usable output down to about 30.

I did come across a single fold tapped horn project by BigMouthDC using four 6.5" Anarchy drivers. Final dims were 9" x 12" x 91". I little taller than I was thinking, but quite a bit narrower. From reading through the Exodus 25Hz project thread, it sounds like the drivers need very little power to drive. Would I be able to get away with an old Harmon Kardon 60W per channel AVR in direct mode to drive the four? This would substancially lower my cost since I wouldn't have to budget for an amp. Then again, the four drivers would be about $250... A single 10" like the Alpine that you mentioned in the T-6 thread would be quite a bit cheaper.

Edit: Ah crap- now that I have a catchy name for this project, I'm going to have to move forward with this biggrin.gif. It will be a 2001 tribute: TMA-1 Monolith.

12" x 18" x ?
10" driver

I've got lots of learning to do...
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post #6 of 18 Old 06-19-2013, 02:30 PM
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Technically, the TMA monoliths had a fixed ratio of the dimensions, 1:4:9.

So - you'd either have to make a really big box to accommodate a 10 (1' deep, 4' wide, 9' tall) or use a 5" woofer to keep it at 60" tall.

More power is better. Small amps clip too soon.

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post #7 of 18 Old 06-19-2013, 07:06 PM - Thread Starter
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Quote:
Originally Posted by lilmike View Post

Technically, the TMA monoliths had a fixed ratio of the dimensions, 1:4:9.

So - you'd either have to make a really big box to accommodate a 10 (1' deep, 4' wide, 9' tall) or use a 5" woofer to keep it at 60" tall.

Yeah- I knew somebody would call me out on that one, but I can't exactly place a 1' x 4' x 9' sub in my living room and remain married. rolleyes.gif
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post #8 of 18 Old 06-19-2013, 07:08 PM
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Originally Posted by tampa frank View Post

Yeah- I knew somebody would call me out on that one, but I can't exactly place a 1' x 4' x 9' sub in my living room and remain married. rolleyes.gif

Only reason I knew that was because I've already tried to fold a tapped horn into that shape.

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post #9 of 18 Old 06-20-2013, 01:19 AM
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Someone had a monolith sub at burning man in 2009. I think it was 1*4*9 ft. I'm not sure what the insides were like.

I built an 11ft tall monolith that year, with speakers in it, but not much engineering behind the speakers. It was a frame covered in grill cloth with a 15" open baffle sub driver, and open baffle 6" 2-ways inside. "Open baffle" is a generous description; I really just screwed drivers into boards. smile.gif

-Max
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post #10 of 18 Old 06-21-2013, 07:36 AM - Thread Starter
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I found a design that matches my target dims pretty well (12" x 18" x 73"): http://www.cowanaudio.com/images/30Hz%20Tapped%20Horn_2.gif

Looks like an older design (from 2007) using a 12" Emminence driver. How much effect does swapping drivers have on a tapped horn? Would an Alpine SWS-12D4 work with a design like this?

I know that I am off in the weeds here. I tried following LilMike's hornresp tutorial, and even with an engineering degree and a minor in physics, I found it pretty difficult to follow. Admittedly, I haven't been able to dedicate much time into learning it yet. I'm sure if I could sit down and play with it some, it would make a lot more sence. Still, I think that I am better off following plans that are already done for my first DIY sub project.
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post #11 of 18 Old 06-21-2013, 08:40 AM
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Originally Posted by tampa frank View Post

How much effect does swapping drivers have on a tapped horn?
The same as with any alignment, having the correct driver specs is critical to a good result. Also, tapped horns are far more finicky than other alignments where driver choice is concerned. Most amateur designers don't get tapped horns right. Yes, they may get 4 to 6dB higher sensitivity than the same driver in a reflex cab, but that's nothing to get excited about. 8 to 12dB is what you can and should be getting, but most don't, as they don't get the cab/driver matching as good as it should be.

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post #12 of 18 Old 06-21-2013, 10:33 AM
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post #13 of 18 Old 06-21-2013, 04:37 PM
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The Infinity folded horn I built a couple of years ago nearly matches the dimensions that you were looking for. It also will work very well with the el cheapo Infinity Reference 1260w or 1262w woofers.

I eventually replaced this horn with a pair of Alpine 1242's in an opposed sealed enclosure. This horn with a measly 500w could still put out more bass above 20hz than this pair of Alpines could with 2000 watts pushing them.

http://www.avsforum.com/t/1329918/18hz-infinity-offset-horn-tower
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post #14 of 18 Old 06-24-2013, 11:03 AM
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Originally Posted by tsloms View Post

The Infinity folded horn I built a couple of years ago nearly matches the dimensions that you were looking for. It also will work very well with the el cheapo Infinity Reference 1260w or 1262w woofers.

I eventually replaced this horn with a pair of Alpine 1242's in an opposed sealed enclosure. This horn with a measly 500w could still put out more bass above 20hz than this pair of Alpines could with 2000 watts pushing them.

http://www.avsforum.com/t/1329918/18hz-infinity-offset-horn-tower

Then why replace it? The <20hz response?
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post #15 of 18 Old 06-24-2013, 03:15 PM
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Then why replace it? The <20hz response?

I had a bad case of builditis! I had to build something and I was looking for something that would be a bit less of an elephant in the room and I wanted the low bass as well. The sealed pair is less than half the size of the horn and looks much nicer.
I sold the horn to a buddy of mine that is looking to sell it off now. He lives in a duplex! biggrin.gif
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post #16 of 18 Old 06-24-2013, 03:44 PM
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For WAF you could build it floor to ceiling and finish it like the walls, or smooth with trim paint so it looks like a column.

IMO would be an aesthetic improvement to typical plain drywall construction.

Sell it to her as a feature, not a bug.

Noah
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post #17 of 18 Old 06-24-2013, 04:06 PM
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Check out Paul's tapped horn - http://redspade-audio.blogspot.com.au/2012/01/rythmik-dual-opposed-tapped-horn-sub.html

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post #18 of 18 Old 06-24-2013, 11:32 PM
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that frequency response is not so good,
but such was common in some earlier
tapped horn designs.

better options are available today.

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