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Hd15 - my versioin
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JD01 View Drop Down
Young Croc
Young Croc


Joined: 23 August 2004
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Points: 819 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JD01 Quote  Post ReplyReply Direct Link To This Post Posted: 12 April 2005 at 3:52pm

Originally posted by TDA-Audio TDA-Audio wrote:

There is no area of a mouth less

I don't understand.
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TDA-Audio View Drop Down
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Joined: 11 February 2005
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Points: 294 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TDA-Audio Quote  Post ReplyReply Direct Link To This Post Posted: 12 April 2005 at 8:28pm
small mouth
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Disco Stu View Drop Down
Old Croc
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Joined: 03 March 2005
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Points: 2487 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Disco Stu Quote  Post ReplyReply Direct Link To This Post Posted: 17 April 2005 at 2:40pm

Will all the drivers recommended for the regular HD15 work in this box?

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

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ricky View Drop Down
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Points: 54 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ricky Quote  Post ReplyReply Direct Link To This Post Posted: 18 April 2005 at 6:56am

How exactly did you take the frequency response plot of your design with the justMLS? I am trying to do the same, for my first time and I need your advice. What adjustments do I have to make to the program in order to see the frequency respons?

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Old Croc
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Points: 2744 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tb_mike Quote  Post ReplyReply Direct Link To This Post Posted: 22 April 2005 at 4:25am

Simple design,I myself considered something similar with flat section panels saving much construction time.

Cheers
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davey t View Drop Down
Young Croc
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Joined: 11 March 2004
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Points: 1428 		Post Options Post Options   Thanks (0) Thanks(0)   Quote davey t Quote  Post ReplyReply Direct Link To This Post Posted: 23 April 2005 at 7:41am

I like it.

Isn't this the 15" Turbosound folded horn design? If not, its very simmilar. Or did you just reduce the dimentions from the speakerstore 18" version?

The horn is actually a little longer than the HD15, and the extra length means it'l be more stable for stacking porn horns/mt122's on top. Sound wise it'l be the same as a hd15 i recon, maybe a tiny bit lower?

What do people think about using the SN15b in this type of bin. I think it would work pretty well. Be cheap and light too. You could build 12 of them for around £1500! 3 t.amp2400's to power and your snorted.

hmm........

 
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jeth View Drop Down
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Points: 12 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jeth Quote  Post ReplyReply Direct Link To This Post Posted: 24 April 2005 at 6:22am
Tda..any chance you could tell us the correct
measurement for the back corner of rear
chamber...currently marked (20) but this is surely not
the correct millimetre measurement.
I have some free time right now and wanted to build
a box up, and maybe one standard HD15 to
compare...
Be grateful if you can help me here! Thanks...
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jeth View Drop Down
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Points: 12 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jeth Quote  Post ReplyReply Direct Link To This Post Posted: 24 April 2005 at 6:33am
TDA..just been checking out the plans again and it
seems Davey-T is correct..the design seems to have
been scaled from the 18 design also on your site, in
all dimensions except the width of the cab.
Following this rule I got a measurement of
115.5mm for the rear chamber corner..does this
seem right? Thanks...
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TDA-Audio View Drop Down
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Points: 294 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TDA-Audio Quote  Post ReplyReply Direct Link To This Post Posted: 24 April 2005 at 12:11pm
>>>currently marked (20) but this is surely not
the correct millimetre measurement<<<

(20) - (00) millimetre - depends on size(dimensions) of the framework of the driver (15").
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jeth View Drop Down
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Points: 12 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jeth Quote  Post ReplyReply Direct Link To This Post Posted: 24 April 2005 at 12:46pm
TDA..thanks for your reply..before I read it I just drew
out the design on a panel and experimented. With
such a small distance between where the baffle
meets the back panel and the corner of the box it
seems unlikely that most drivers will fit..though I
noted in the photos shot through the handle cutouts
that you seem to have sunk the driver into the panel
to gain space..either that or it's mounted from the
horn side..but I can't imagine the back is removable.
I guessed the end panel behind the driver is made
removable.
So if this dimension is flexible..would it be suitable
to use something between the 20mm and the
115mm i calculated from scaling down the 18 by the
common factor i found. This would give me space
for my driver...but would it throw out the acoustics to
change the horn geometry so much?
i'm still learning so it's good to know these things if
possible..Thanks again TDA..      
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ceharden View Drop Down
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Joined: 05 June 2005
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Points: 11741 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 30 July 2005 at 3:50pm
I've been looking at some alternative ways of building horn loaded 15"s partially to try to teach myself the theory on how they work.

Looking back at this design and doing some simulation of it, I'm wondering if this is even more like a bandpass horn than the HD15.  It has a front chamber almost as big as the rear and the simulated response certainly looks more like a bandpass than a horn. Seems impossible to iron out the dip in the middle of the response without drastically reducing the front chamber and thus loosing low extension.

Thoughts anyone, TDA?
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TDA-Audio View Drop Down
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Points: 294 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TDA-Audio Quote  Post ReplyReply Direct Link To This Post Posted: 01 August 2005 at 10:21pm
Reducing the forward chamber we shall reduce recession on higher frequencies. The forward chamber is the filter with recession 6δα
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