Horn Enclosure
Printed From: Speakerplans.com
Category: General
Forum Name: Advanced Discussion
Forum Description: Advanced discussion area for higher lifeforms
URL: https://forum.speakerplans.com/forum_posts.asp?TID=105345
Printed Date: 19 April 2024 at 12:26pm
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com
Topic: Horn Enclosure
Posted By: keith192001
Subject: Horn Enclosure
Date Posted: 06 June 2020 at 1:45pm
Can someone help me design a horn loaded enclosure like the one in the image below; i have a massive audio hippo xl 15'' dual 2 ohm wiring in parallel, i want the enclosure tuned to 50hz.
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Replies:
Posted By: Danielr
Date Posted: 06 June 2020 at 3:04pm
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This driver? https://www.massiveaudio.com/products/hippoxl152" rel="nofollow - https://www.massiveaudio.com/products/hippoxl152
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Posted By: Robbo
Date Posted: 06 June 2020 at 3:32pm
| Just get an old plywood Tea Chest and cut a hole in it as you will be wasting your money on any other construction!!!!! |
Posted By: keith192001
Date Posted: 06 June 2020 at 3:44pm
| Yes that's the driver |
Posted By: Danielr
Date Posted: 06 June 2020 at 5:15pm
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So... Is this for car audio? |
Posted By: keith192001
Date Posted: 06 June 2020 at 6:15pm
| Yes it's for car audio, i really want to experience this horn enclosure but i have no knowledge on how to design one. |
Posted By: munkey
Date Posted: 06 June 2020 at 6:43pm
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You don't want/need a horn in your car. Ported reflex is what you need
-------------  the midtops!
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Posted By: Danielr
Date Posted: 06 June 2020 at 9:09pm
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If you use WinISD (or horn resp) you can copy the parameters of that site to model the driver, and then design a box around it. WinISD even dives you suggestions as to the box size and an idea of the frequency response. (my only complaint of winISD is that it does not let you "play" with the port sizing enough...) but it is easier, if you have no experience modelling and building speakers, then you should (almost certainly) start with WinISD. If you are building a sealed box... For your driver, that site claims 75L is sufficient. (~45cm x 45cm x 37cm) Win ISD suggests a box of 100L (~ 45cm x 45cm x 49cm) the plots do not show a huge difference between the two. If you want a ported enclosure... that site suggests 17.8" x 16.6" x 17.8" (~45cm x ~42cm x ~45cm) (85L) with a (round) 9.4" (23cm) wide vent that is 8.6" (21cm) deep (I has to model that as 2 8.2cm vents (total vent area ~105cm^2) with a tuning frequency of 35Hz the plot is a bit messy, but has a (significant) hump around 40 - 50Hz (which is what you want?) WinISD suggests a 166L box, (~45cm x ~45cm x ~81cm) with a 23hz tuned port (1 10.2cm diameter port that is 20cm long) (this gives a reasonably flat curve down to around 23Hz (the roll off is steep though.) (edit, win ISD says quite flat, horn resp disagrees a bit.) |
Posted By: Danielr
Date Posted: 06 June 2020 at 9:12pm
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About horns... (that box you posted a picture of is a reflex box with a very large/long flared port.) (so that adds the extra effort of learning how to use hornresp.) As for "how to model that in horn resp, in your mind, imagine that driver is mounted backwards (outside the box.) So what you want is, no back box. (because you'll use the flare sections to make a square box), then flare section 2 to make the port opening, then flare section 3 to expand that port opening out to the world. I looked at the picture, and made some guesses of the dimensions (assuming that's a 15" driver in the picture.) What you end up with is a baffle that is 40cm x 40cm creating a box that is ~ 35cm deep, (I've allowed 5 to account for the driver volume) section 1, (Con) S1 = 1600, S2 = 1600 L=30 section 2, (con) S2 = 1600, S3 = 200 L=0.1 (this will let you open a 40cm x 5cm hole in the top of your box, that will be your port.) Section 3, (con) S3 = 200, S4 = 1400, L=110 (this opens out your square flare over a 1.2m distance (about enough to wrap around the box) opening to a 40cm x 35cm flare opening. The frequency response is 40(ish) hz, - 90Hz (ish) reflex schematic.  Reflex frequency response  reflex with a long and wide flared port.  frequency response.  So the total box size is roughly 40cm tall, 70cm long and ~ 50cm deep. - that's 154 litres of space (simulation doesn't account for the volume taken up by drivers or bracing...) About the same size as the ported reflex that WinISD started all this with, but not dropping as low. You're also going to have the trouble that no simulation program will consider the cars cabin space. (so all of that is wasted anyway. I used corner placement loading. (if you change it to center floor it narrows the response even further.) all those simulations are for this box placed in the corner of a large room, (not tucked up in the boot of a small car.) Then you have to consider do you have the tools and the ability to build this horn? building a reflex box is pretty much Build box, cut a round hole for the speaker, and cut a hole for the port... (and push in a bought port.) building this flared port in a box is going to involve cutting a lot of mitered edges... If you want to learn how to use Horn resp, I'd consider following a tutorial for a box, and then playing with the values (one value at a time) and seeing what the effect is. (so how does port size or length affect the tuning frequency. how does box volume effect frequency responses etc.) (how big is the car...? - that will complicate things as you need to fit whatever box you build into the space available!) (have you ever made a speaker enclosure before?) Like the munkey and the manufacturer said... - What you want is a ported box. |
Posted By: BP1Fanatic
Date Posted: 19 August 2020 at 6:29pm
| Danielr, your pics are not showing. |
Posted By: KidCreole
Date Posted: 19 August 2020 at 7:43pm
------------- Mykey Wattco |
keith192001 wrote:Posted By: AndyWave
Date Posted: 07 January 2021 at 7:52pm
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I have to say that over ten years ago i designed a 30Hz tapped horn for 10" long excursion car hifi driver. It took the whole boot of a Mitsubishi 3000 sports car...It was kind of success, because those who didn't know how horns work, tried to find more hidden sub drivers.  Also the same folks could not believe there was only 600 RMS power to the one poor 10" So it sort of could be done. Model in 0.5pi for the doors closed and 2pi for boot / doors open. Watch for driver excursion in 2pi.... driver parameters (Z) 2x2Ω (fs) 39Hz (Pmax) 2x300W (P) 2x200WRMS (1W/1m) 87dB (Cms) 0,13mm/N (Mms) 120g (Qms) 4,46 (Qes) 0,48 (Qts) 0,43 (Vas) 21 l (Re) 2x1,7Ω (BxL) 14,82Tm (Le) 2,0mH VC Ø 75mm (Xmax) ± 12mm (Sd) 340cm2 ------------- torturing electrons since ...... |
Posted By: MattStolton
Date Posted: 19 January 2021 at 11:28am
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Given you will be putting some style of box, be it Horn, BR or sealed, inside another box (the boot); should you not consider the volume of the boot, and then think Band Pass, as the two volumes will form a compound box system? Squinting hard and oversimplifying, putting a sealed or BR into "another box", is a form of Band Pass box? Given volume of cab/boot/total car are of similar orders of magnitude, all could affect the tuning? Opening the car's windows may affect tuning? So. Sealed or BR then. ------------- Matt Stolton - Technical Director (!!!) - http://www.wildingsound.co.uk" rel="nofollow - Wilding Sound Ltd "Sparkius metiretur vestra" - "Meter Your Mains" |