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21" ported horn (Othorn competitor)

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Matty309 View Drop Down
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    Posted: 26 January 2020 at 4:03pm
Hi all,

After spending much time thinking about building the othorn and spending £550 on a driver i thought i would design myself a ported horn with the RCF LF21n451. A £360 driver. 

my goals of the design are to have the extension that the typical reflex enclosure has whilst still preserving the impact and "throw" of a horn. might be worth noting i have previously designed and built 2 dual 15" folded horns to sit on top of these but im not sure if id even need them with this design.

Spending a short while on hornresp i came up with the following as shown in the images, performing similarly to the othorn whilst being significantly easier to build. I would design the enclosure on solidworks and it would probably be similar to the Void acoustics Nexus XL in terms of shape and layout.

Also with a bit of eq you can increase extension to have a f3 @ 30hz 

This is the results at Xmax, 1.25KW into 8ohms


it may be worth mentioning if you use a driver with a higher BL and Xmax (B&C 21) you can put about 2KW into the driver resulting it a 135db continuous output across its operating range. 

See what you guys think.

Thanks




Edited by Matty309 - 28 January 2020 at 8:35pm
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VECTORDJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2020 at 9:12pm
A+
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VECTORDJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2020 at 9:18pm
Layout drawing???
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Matty309 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Matty309 Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2020 at 10:07pm
haven't got a specific drawing yet as still deciding. but it will look like something similar to this..
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MarjanM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 29 January 2020 at 12:43am
According to that HR info you provided, the box should be about twice the size of the one you are showing there.

Marjan Milosevic
MM-Acoustics
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Matty309 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Matty309 Quote  Post ReplyReply Direct Link To This Post Posted: 29 January 2020 at 1:09am
I would like to know, where did you get the information from as your saying 900 litres for a single 21?

The total volume of the enclosure in the simulation is 450 litres . 240litre rear vented chamber plus a short horn approx 1.3m.

The drawing was crudely done just for a representation of my idea.

Thanks 
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MarjanM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 29 January 2020 at 1:00pm
The horn length on that box there is about 70cm. You need it to be 131cm, that is almost twice the length. Back chamber also is very small on that drawing. Probably about 70-80 lit. You need 240lit.



Edited by MarjanM - 29 January 2020 at 1:02pm
Marjan Milosevic
MM-Acoustics
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https://www.facebook.com/pages/MM-Acoustics/608901282527713
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Matty309 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Matty309 Quote  Post ReplyReply Direct Link To This Post Posted: 29 January 2020 at 1:15pm
Yeah I know that why I meant it was for s rough representation. I will increase depth and height on box to extend horn and increase volume 
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VECTORDJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 29 January 2020 at 1:59pm
A+  I always liked horn subs with ported rear chamber. More bass on the dance floor with punch compared to sealed chamber horn subs.  VECTORSONICS
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Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 29 January 2020 at 2:10pm
This horn should be able to fit in a CV Earthquake size 36 x 24 x 36 inch box???????? 
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cravings View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cravings Quote  Post ReplyReply Direct Link To This Post Posted: 29 January 2020 at 3:38pm
kevin had a thread a couple of years back might be of interest to you

https://forum.speakerplans.com/21-ported-horn-design-idea_topic102437_page1.html?KW=othorn
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MarjanM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 29 January 2020 at 3:56pm
Originally posted by VECTORDJ VECTORDJ wrote:

This horn should be able to fit in a CV Earthquake size 36 x 24 x 36 inch box???????? 

Horn mouth is quite small, so probably not that big. More like Martin WMX. 
Marjan Milosevic
MM-Acoustics
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