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Old 5th November 2012, 06:02 AM   #1
3GGG is offline 3GGG  Australia
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Default Bass Horn Idea

The quest for clean bass to go with a 4 way front loaded horn system continues. As my listening room is 6m by 6m with only 2100 ceilings i am looking at building bass horns similar to the Le Cleach bass stands but split into 2 and running vertically. They need to do up to 100Hz, no driver are ordered yet but am open to suggestions, probably in the 15 to 18 inch pro driver range.

Has anyone built horns like these? Construction should actually be fairly straight forward, lots of framing, bendy ply and dampening.

How do I model this in Hornresp, i assume i set the diameter to double what it will be and the flare termination to 90 degrees? Any help modelling this would be great, as a mac user it is difficult to get to a pc to use hornresp.

Excuse the 3 minute sketch, it only shows one horn but though it may help.
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Old 5th November 2012, 06:58 AM   #2
jwmbro is offline jwmbro  United States
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Hi,

You say how high you want to go, but not how low you want to go - though perhaps this is limited by using an FLH with your dimensional constraints.

Here's my attempt at a hornresp entry, using two parallel LAB12s per horn, it only simulates as going to 40Hz, I believe your effective low corner should be lower, as low as 30Hz, due to the ceiling, wall and floor increasing horn length and mouth size. But I'm unsure how accurate simulating this in Hornresp would be - You could try adding on wide parallel expansions for L23, perhaps an extra 2 meters, up to the maximum area hornresp allows - 99999cm2. This shows a bit extra bass, but still rolling off at 40, just less steeply.

Click the image to open in full size.

Should do over 130dB at listening position, perhaps too loud for home use?
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Old 5th November 2012, 07:06 AM   #3
3GGG is offline 3GGG  Australia
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How low i will trade lower frequency for outright spl , 25 to 30 Hz would be great. Mini dsp can help with bit of eq and time delay.

Last edited by 3GGG; 5th November 2012 at 07:10 AM.
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Old 5th November 2012, 07:15 AM   #4
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by jwmbro View Post
Should do over 130dB at listening position, perhaps too loud for home use?
if there is a home after that blast
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Old 5th November 2012, 07:36 AM   #5
3GGG is offline 3GGG  Australia
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luckily i live on a few acres and the music room is freestanding with an outer and inner stud wall to keep the sound in. 130db would be about 30db overkill
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Old 5th November 2012, 09:22 AM   #6
jwmbro is offline jwmbro  United States
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Hi 3GGG,

I assumed 130dB (and this was a conservative estimate, with one of these in each corner, I would not doubt 140dB to be possible) would be too much, but the matter of the fact is your sketched design allows for about 170cm path length, perhaps a bit more, if you want a straight horn. 170cm is the quarterwave length of a 50Hz sound wave, So I don't think you will be able to get proper hornloading down to 25Hz in this design.

How fixed are you on this design? You say time delay is not a problem, how about a folded horn, or even a Tapped Horn / T-TQWT? If you put the rear chamber at the bottom of where you intend the opening to be, and then run a thin path to the corner, fold over once, and expand out to your current opening idea, you could probably get proper hornloading down to 25Hz.

And even then, SPL will be vastly more than you could possibly need in a home (simulated using two high excursion 12s, but using a single 18 should have similar output capabilities).

But matter of the fact is, even with your original design, you have so much output capability, you could probably just EQ flat to 25Hz and still get 110dB @ chair.
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Old 5th November 2012, 10:02 AM   #7
3GGG is offline 3GGG  Australia
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I like the idea of doing a single fold, but would be much harder to build. I have looked at tapped and T-TQWT aswell. I really like the simplicity every time i see one of the LeCleach horn stands and since i have a dedicated room, what the hell
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Old 5th November 2012, 10:04 AM   #8
3GGG is offline 3GGG  Australia
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http://img209.imageshack.us/img209/7...024x768qs8.jpg
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Old 5th November 2012, 10:19 AM   #9
3GGG is offline 3GGG  Australia
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this would be handy if i could understand how to use it, and French
lecleach
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Old 5th November 2012, 02:25 PM   #10
epa is offline epa  Netherlands
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this looks like a nice project.
any ideer how much to spend on the speaker.
fi instead of starting in the lower corner ,you could start at the upper corner>then to the lower corner>90degr bend >a few meters in to the room.
mini dsp comes in handy.

many years ago whe(a freind)where going to do exactly that.
but he moved from that house+he got a girlfreind
grtz erik
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