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Tapped Horn for B&C 15NW100
Tapped Horn for B&C 15NW100
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Old 7th January 2017, 08:13 AM   #11
epa is offline epa  Netherlands
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nice one oliver.
les then 300ltr stil doing 98db av.
looks like a winner.
6 per side (maybe 3 on 3 endfire aray) wil do
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Old 7th January 2017, 08:57 AM   #12
Circlomanen is offline Circlomanen  Sweden
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Martinsson's Blog

We are updating the THAM-series with the front-resonator enhanced tapped pipe design I have been exploring for some time now.

You get a very high efficiency and a great midbass-attack from this design.

JMF-THAM15-115TPQWR.jpg

Here is some comparison between the normal THAM15 and the TPQWR-115, both with the same B&C 15TBX100.

The B&C 15NW100 should work like a charm in this horn.
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Old 7th January 2017, 11:32 AM   #13
martina is offline martina
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I have some empty enclosure here with internal size of: 670mm High 800mm deep and 410mm wide.

Mouth of the enclosure is 670mm x 410mm

Is it possible, design a FLH or TH into this enclosure?

At the moment, I have 6 of this enclosure with 2x15nw100 inside as ported.

Regards
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Old 7th January 2017, 03:23 PM   #14
tb46 is offline tb46  United States
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Hi martina,

Post #13: "...internal size of: 670mm High 800mm deep and 410mm wide...Is it possible, design a FLH or TH into this enclosure..."

That's a bit of a loaded question. What is the material of the existing boxes, and are you a master woodworm? :-) Tapped horns w/ high throat compression require solid construction and air tightness of the horn path. Also, it's hard to give an opinion w/o seeing the enclosure details.

You have never defined/posted the low corner for your project, assuming around a solid 40Hz you end up w/ a path length as in Posts #9 and #10. Luckily, two of your dimensions are already close to the side view, so you have to evaluate what happens when you narrow the enclosure while maintaining approximately the same horn fold. All areas (S1-S5 in Hornresp) become smaller, the path length gets to be a little longer, the compression ratio increases from 3 to 4. It should work, if the driver can handle the high compression ratio, something I do not know, and I cannot evaluate. Obviously, other folds can be made to fit, maybe better?

I'll attach an SPL comparison, and a quick sketch.

Regards,
Attached Images
File Type: png THAM15_Forsman_Mod_2_narrow_v_wide.PNG (20.9 KB, 186 views)
Attached Files
File Type: pdf THAM15_Forsman_Mod_2_wide_v_narrow.pdf (13.3 KB, 34 views)
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Last edited by tb46; 7th January 2017 at 03:31 PM.
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Old 7th January 2017, 03:30 PM   #15
tb46 is offline tb46  United States
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Hi Circlomanen,

Post #12: "...updating the THAM-series with the front-resonator enhanced tapped pipe design..."

Nice work. Thanks for sharing.

Regards,
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Old 7th January 2017, 04:29 PM   #16
martina is offline martina
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Hi Oliver,

thanks for posting your answer. Can you post here the dxf file, i try to convert the pdf, but it dont work.
Than i try to modeling the TH in our existing enclosures.

The enclosure are made of 15mm brich ply wood
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Old 7th January 2017, 11:24 PM   #17
tb46 is offline tb46  United States
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Hi martina,

I'll attach the dxf file w/ the extension changed to .txt, just change it back to .dxf, and it should work. I used 3/4"nom. 23/32" plywood in the drawing.

Regards,
Attached Files
File Type: txt THAM15_Forsman_Mod_2.txt (160.2 KB, 14 views)
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Last edited by tb46; 7th January 2017 at 11:31 PM.
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Old 8th January 2017, 02:00 AM   #18
Zero D is offline Zero D  United Kingdom
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@ Circlomanen

Interesting. This concept is something i thought of too, but didn't explore it fully. Good to see you are
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Old 9th January 2017, 07:58 AM   #19
USRFobiwan is offline USRFobiwan
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Tapped Horn for B&C 15NW100
ha! Then it is not a THAM but a Thorn design.
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Old 9th January 2017, 08:04 AM   #20
USRFobiwan is offline USRFobiwan
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Tapped Horn for B&C 15NW100
Quote:
Originally Posted by Circlomanen View Post
Martinsson's Blog

We are updating the THAM-series with the front-resonator enhanced tapped pipe design I have been exploring for some time now.

You get a very high efficiency and a great midbass-attack from this design.

Attachment 590436

Here is some comparison between the normal THAM15 and the TPQWR-115, both with the same B&C 15TBX100.

The B&C 15NW100 should work like a charm in this horn.

That is really interesting simulation. I know you guys where busy with the resonator concept. So can we call this THAMMB?
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