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15" tapped horn plans
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Disco Stu View Drop Down
Old Croc
Old Croc


Joined: 03 March 2005
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Points: 2492 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Disco Stu Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2008 at 5:54pm
Excuse my ignorance can you explain the difference between 1/2 and 1/4 wave?

Stu

Edited by Disco Stu - 19 May 2008 at 6:02pm
All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output

My acts:
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Disco Stu View Drop Down
Old Croc
Old Croc


Joined: 03 March 2005
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Points: 2492 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Disco Stu Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2008 at 6:10pm
Phil do you think a horn with a length as long as the TH style one posted above would benefit a 12" better than a 15"?

Have you seen a good 12" for tapped horn loading? Have you done any models of horns down to 40Hz using such a design. I kind of like the look of the TH Mini.

Think theres anything similar that could be achieved as a DIY?

Stu
All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output

My acts:
www.myspace.com/thebowiexperience
www.myspace.com/scheisseelektronisches
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Deadbeat View Drop Down
Old Croc
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Joined: 12 March 2008
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Points: 3167 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Deadbeat Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2008 at 6:55pm
Anything to do with Hi-Fi TQWTs?
http://www.quarter-wave.com/
http://www.t-linespeakers.org/
Hi-Fi was my background originally.

I know a fair bit about them, but am looking at this fancy new 'Tapped horn' design.

What really is it? Confused
Away on extended leave.
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heinrich View Drop Down
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Joined: 21 February 2007
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Points: 280 		Post Options Post Options   Thanks (0) Thanks(0)   Quote heinrich Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2008 at 5:10am
m8's,

just for the truth Wacko the design actually blurs my thinking for while, the drawing was just a way bit complicated than I expected..........LOL
.....power is nothing without control....
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_djk_ View Drop Down
Old Croc
Old Croc


Joined: 23 November 2004
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Points: 5992 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2008 at 1:05pm
That's not what's inside a TH115, it's way too complicated.
 
"Have you seen a good 12" for tapped horn loading? Have you done any models of horns down to 40Hz using such a design. I kind of like the look of the TH Mini."
 
The TH Mini is a 50hz tapped horn.  

I have a plan for such using a suitable RCF driver, it's 101.5dB at 55hz, 100.5dB average, 3dB down at 47hz, ±1dB 50hz~160hz.
 
| 50 Hz Tapped Horn
Def_Const |Horn Dimensions
{
a1 = 150e-4; |Area at throat (cm^2)
a2 = 250e-4; |Area at rear of driver (cm^2)
a3 = 1100e-4; |Area at front of driver (cm^2)
a4 = 1200e-4; |Area at mouth (cm^2)
l1 = 15e-2; |Distance from throat to rear of driver (cm)
l2 = 178e-2; |Line distance from rear of driver to front of driver (cm)
l3 = 25e-2; |Distance from front of driver to mouth (cm)
}
Def_Driver 'Dr1'
| RCF L12P540
Sd=530cm2
fs=59Hz
Qes=0.36
Qms=11
Vas=45L
Re=5.6ohm
Le=1.8mH
system 'S1'
Driver Def='Dr1' Node=1=0=3=4
Waveguide 'W1' Node=2=3 STh={a1} SMo={a2} Len={l1} Conical
Waveguide 'W2' Node=3=4 STh={a2} SMo={a3} Len={l2} Conical
Horn 'H1' Node=4 STh={a3} SMo={a4} Len={l3} Conical
 
I have a scale drawing at work, tell me if you want me to upload it.
djk
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snowflake View Drop Down
Old Croc
Old Croc


Joined: 29 December 2004
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Points: 3443 		Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2008 at 1:49pm
the problem designing tapped horns is there aren't manany suitable drivers on the market. you need much higher fs than for FLH. If you are trying to cover 20-80Hz you can use an off-the-shelf driver that you would normally use for a higher range (Fs of 40-50Hz) but if you want to cover 40-100Hz there isn't really anything suitable that still has decent xmax. if anyone sees anything let me know...
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Disco Stu View Drop Down
Old Croc
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Joined: 03 March 2005
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Points: 2492 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Disco Stu Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2008 at 2:12pm
Originally posted by _djk_ _djk_ wrote:


I have a scale drawing at work, tell me if you want me to upload it.


Yes please DJK is it an off the shelf RCF?

Stu
All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output

My acts:
www.myspace.com/thebowiexperience
www.myspace.com/scheisseelektronisches
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Deadbeat View Drop Down
Old Croc
Old Croc


Joined: 12 March 2008
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Points: 3167 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Deadbeat Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2008 at 4:52pm
*This is not a TH115 (Just a notice, for people who search and find these plans).

I've found an amendment to the plans:

http://www.mediafire.com/?wciyrmbzzx4

Smile

Also: The original tapped horn plan mentioned in the monster thread over at diyaudio:

http://www.mediafire.com/imageview.php?quickkey=8um2t1le9hx&thumb=4
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_djk_ View Drop Down
Old Croc
Old Croc


Joined: 23 November 2004
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Points: 5992 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 21 May 2008 at 2:16am
Still wrong.
djk
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_djk_ View Drop Down
Old Croc
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Joined: 23 November 2004
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Points: 5992 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 21 May 2008 at 2:27am
Store image, then open for editing in Paint, 20 pixels per inch. External dimensions (using 3/4") 16x24x28.


Edited by _djk_ - 21 May 2008 at 8:38pm
djk
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Deadbeat View Drop Down
Old Croc
Old Croc


Joined: 12 March 2008
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Points: 3167 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Deadbeat Quote  Post ReplyReply Direct Link To This Post Posted: 21 May 2008 at 8:35am
It's early in the morning and I'm transferring flights at Heathrow

I'm not sure what you're saying...
What exactly is wrong with what?

This is the guy who designed the 'TH-115 style' design. It turns out he called it that because of the 'back-horn' style folding.
http://www.diyaudio.com/forums/member.php?s=&action=getinfo&userid=61184
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Disco Stu View Drop Down
Old Croc
Old Croc


Joined: 03 March 2005
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Points: 2492 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Disco Stu Quote  Post ReplyReply Direct Link To This Post Posted: 21 May 2008 at 4:48pm
It is a TH115 STYLE design not the actual design itself, and its probably only called that because the dimensions are almost identical.

Stu
All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output

My acts:
www.myspace.com/thebowiexperience
www.myspace.com/scheisseelektronisches
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