A wild Horn out of Africa - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 26 Old 10-13-16, 12:40 PM Thread Starter
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A wild Horn out of Africa

This is a build critique thread by someone who feels he must have a horn.
Before you read please note ;
1. This is one of those jobs by people who have messed around with Hornresp for some weeks and feel they know enough to design and build their own rather than picking any of the available proven tapped horn designs on the forums for sure results.
2. The builder has insisted on forcing the driver available to him to fit a tapped horn rather than working with proven drivers for acknowledged tapped horn Subwoofer performance.
3. The builder working with mostly scrap plywood and no prepared cutlist or pre-cut panels, built as measurements dictated, cutting one panel after fixing the previous, fumbling away blissfully.
4. The builder has no plans or wherewithal for now for acoustic measurements on completion but hopes to rely on listening sessions until such a time as he is able to to acquire or have access to the relevant equipment and know how.
If these sins can be forgiven, then here we go.
First the sims as they seemed ok to me.
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Last edited by Toffkanda; 10-13-16 at 02:46 PM. Reason: Wrong spelling
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post #2 of 26 Old 10-13-16, 01:40 PM Thread Starter
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Re: A wild Horn out of Africa

The driver is a 12 inch Epik sentinel, a heavy strong motored driver with the attached t/s parameters.
The goal is 16-17hz Fc and about 3 times the SPL of that driver in a bass reflex cab, enough to fill my big room (4500cuft) since I don't have enough drivers. The horn is really tall with a very small footprint,should be unobtrusive in a room corner. Success with this should generate a twin.
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post #3 of 26 Old 10-13-16, 01:55 PM Thread Starter
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Re: A wild Horn out of Africa

Ah yes., the driver t/s parameters....
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post #4 of 26 Old 10-13-16, 03:58 PM
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Re: A wild Horn out of Africa

Your first post cracked me up! It almost sounded like a guy talking about his wife to his friends... "sorry fellas, but I have to wear this shirt and go to her families house instead of heading to the bar with you and watching the game".

-Jim

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post #5 of 26 Old 10-13-16, 04:49 PM Thread Starter
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Re: A wild Horn out of Africa

My wife is fortunate that I have nothing to hide from her except of course the occasional purchase of fairly expensive(by our currency standards) sub driver or audio equipment (which I confess to much later) so it comes natural for me to lay out my audio sacrilege upfront. Seriously I'm yet to come across any other DIY Sub audiophile in my locality and it is such an uphill task accessing the things/materials/skills available to you guys over there in the US. I try to to scratch my itch with whatever is available to me that can work. The build is not finished yet but I think I honestly came very close to what was simulated (assuming nothing is fatally wrong with the simulation).

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post #6 of 26 Old 10-14-16, 04:35 PM Thread Starter
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Re: A wild Horn out of Africa

A little background ;
looking at the t/s parameters it occurred to me that it might be suitable in a tapped horn because of a low Qts, low Vas, high BL and strong aluminum cone. Using Little Mike's BL^2/Re/Sd assessment it yields 0.27 which is just outside his comfort zone (0.13-0.25).
In a bass reflex cab it wants a small volume for true 20hz performance and from the Hornresp simulation, it seems to be no different in a tapped horn. Indeed by simulation it appears to do 20hz and below under a 300 litre volume but of course other parameters including SPL may not be worthwhile over a ported box.
Also the sentinel is known for palpable room pressurisation and it appears to correspond with the relatively high throat pressure which I assume is a testimony to the powerful motor. It does desire a really high compression ratio but one has to resist this in modelling, hence a final ratio of 3.75:1.
I have not tested but I'm convinced by DIY Speaker guy's argument about the FR differences of large voice coil/high inductance motors and I see that it applies to this driver. So in modelling I ticked the large voice coil option under loudspeaker wizard to get a modified FR.
There also appears to be some benefit in applying the filling/stuffing option to the 1st segment, it seems to lower the 60-100hz spikes.
I'm therefore expecting reasonable SPL at 2pi (113-115@17hz), percussive room bass pressures, useable extension down to 14hz and quick agile LF Impulse.

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post #7 of 26 Old 10-22-16, 03:40 PM Thread Starter
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Re: A wild Horn out of Africa

Just finished the cabinet. I'm 6ft 2". Add an inch for my sandals.
I hope to be as tall as this cabinet as I grow up .
I'll be coupling it shortly. There's the horn mouth at the bottom and the driver access window above it which is to be covered with perspex for visibility of the driver.
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post #8 of 26 Old 10-22-16, 05:47 PM
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Re: A wild Horn out of Africa

Man, you don't mess around; no sooner do you make this thread then the cabinet is built. Well done...

-Jim

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post #9 of 26 Old 10-23-16, 10:06 AM Thread Starter
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Re: A wild Horn out of Africa

Thanks Jim.
I have to figure out how to skirt the edges of the driver window perspex where it is sunk to flush with the wood because it's edges looks untidy when bare. I need to come up with a kind of margin frame design to beautify the edges. Whether real (aluminum, wood or plastic) or virtual (tape, paint or veneer),I'm wondering what looks best

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post #10 of 26 Old 10-26-16, 04:23 AM Thread Starter
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Re: A wild Horn out of Africa

I briefly tested the horn using just a 30watt old amp with volume dial halfway and test tones 10-20hz and it was very pleasing to me. Almost too loud for the environment it was kept. I look forward to playing it with a 600 watt amp soon.
The test tones shook a lot of things but also showed up a leak at the speaker terminals and added noises from the perspex driver window vibration. It is obvious I need to brace the perspex horizontally from within using a removable brace.
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