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tapped horn design
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login4 View Drop Down
Old Croc
Old Croc


Joined: 03 April 2006
Location: Wales
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Points: 1552 		Post Options Post Options   Thanks (0) Thanks(0)   Quote login4 Quote  Post ReplyReply Direct Link To This Post Posted: 01 March 2007 at 4:59pm
were, iv only seen the ruff outline plan, without all the internal dimentions and angles etc,
CELTIC SUBSONIC SOUND SYSTEMS
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Tekasis View Drop Down
Old Croc
Old Croc


Joined: 03 July 2006
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Points: 6492 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tekasis Quote  Post ReplyReply Direct Link To This Post Posted: 01 March 2007 at 5:16pm
Here:
 
 
Looks seriously wicked
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login4 View Drop Down
Old Croc
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Joined: 03 April 2006
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Points: 1552 		Post Options Post Options   Thanks (0) Thanks(0)   Quote login4 Quote  Post ReplyReply Direct Link To This Post Posted: 01 March 2007 at 5:44pm
wicked man im getting all giddy 

cant wait to hear these..
CELTIC SUBSONIC SOUND SYSTEMS
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mykey View Drop Down
Old Croc
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Joined: 18 August 2005
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Points: 9680 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mykey Quote  Post ReplyReply Direct Link To This Post Posted: 01 March 2007 at 10:47pm
Originally posted by Tekasis Tekasis wrote:

Originally posted by mykey mykey wrote:

and at the price i will be selling them at, it would cost you that to make it
 
Mykey, when your DubSubs are fully completed & painted/sprayed up, are you planning to router the name of the scoop on the sides & front of it just like the punishers & xtros ?
 
oooh yes!
DubSub written in the side and wait till you see the grill and cross brace
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login4 View Drop Down
Old Croc
Old Croc


Joined: 03 April 2006
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Points: 1552 		Post Options Post Options   Thanks (0) Thanks(0)   Quote login4 Quote  Post ReplyReply Direct Link To This Post Posted: 02 March 2007 at 9:04am
DubSub written in the side and wait till you see the grill and cross brace

hi mykey how long will it be before there will be a shipment to the uk then?

would love to see some more pics too...
CELTIC SUBSONIC SOUND SYSTEMS
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Tekasis View Drop Down
Old Croc
Old Croc


Joined: 03 July 2006
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Points: 6492 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tekasis Quote  Post ReplyReply Direct Link To This Post Posted: 02 March 2007 at 9:53am
Originally posted by login4 login4 wrote:

DubSub written in the side and wait till you see the grill and cross brace

hi mykey how long will it be before there will be a shipment to the uk then?

would love to see some more pics too...
 
----------------------------------------- // ------------------------------------------
 
Ditto !!!
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moray james View Drop Down
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Joined: 07 September 2005
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Points: 141 		Post Options Post Options   Thanks (0) Thanks(0)   Quote moray james Quote  Post ReplyReply Direct Link To This Post Posted: 02 March 2007 at 8:12pm
Don't know if William has recently posted this info or if I simply did not see it the first time that I looked. William provides this basic how to for tapped horn design.
 
   If you are interested in trying a tapped horn of your own you can check your design as a back loaded conical in Horn Response. The horn path needs to be 1/4 WL long, or a little longer. You will notice a huge dip just above the low frequency cut off which is caused by the small mouth. Make the peak below the first dip the same amplitude as the one above the first dip by changing the driver, path length, mouth and throat area. This will get you close. The tapping in the horn will sort out the dip. This is a rough rule of thumb that appears to work fairly well, without any extensive modelling. Make sure the driver is at the end of the line. Use a 2:1 compression ratio and a 3:1 taper as starting values. Play with the numbers from there. With the right driver and horn, you should be able to achieve about 2 octaves of bandwidth.
moray james
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james folkes View Drop Down
Old Croc
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Joined: 08 January 2005
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Points: 3064 		Post Options Post Options   Thanks (0) Thanks(0)   Quote james folkes Quote  Post ReplyReply Direct Link To This Post Posted: 02 March 2007 at 9:04pm
i think that's new... that is really fantastic information, i must connect wintel machine to the internet and get a recent enough version of hornresp to do it forthwith... do you know what he means when he says to make sure the driver is at the end of the line, and what is meant by a 3:1 taper? does that imply a cone three units high, diameter one unit?

many thanks to yourself and william for helping us get into the nitty gritty.

james.

ps. it's funny you know, i really don't understand why this thread hasn't run to 50 pages and spawned a dozen children and grand children... phil appears to have arrived at something very close to what is one of the most ground breaking advances in bass horn technology in recent years... i'm sorry, but did most people miss the bit where he said he was running single 15" drivers off a bridged 2.5k amp?

there have been remarkably few people asking the fundamental questions of how does this infernal contraption work? this ability to control cone excursion can unleash so much more from a single driver than seems reasonable, plus i don't know if any of the diy pioneers have gotten as far as phase response measurements, but the danley sound labs th115 has the most insanely flat plot... if we can use our collective intelligence and interest a bit more constructively we might be able to understand enough to really be part of this revolution and not just some innocent bystanders...

there is one entirely forgiveable reason of course, that being that the man td is terribly nice and we don't want to risk depriving him of his livelihood... he did kind of say that he wasn't too bothered about the diy thing, but we clearly couldn't go round marketing our own tapped horns.
mardy hippy.
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freddi View Drop Down
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Joined: 13 December 2006
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Points: 60 		Post Options Post Options   Thanks (0) Thanks(0)   Quote freddi Quote  Post ReplyReply Direct Link To This Post Posted: 04 March 2007 at 1:04am
what's William suggesting to juggle in sim? - does he mean a 2nd overlay and ballpark sum the two by eye/mind?

anyone care to do an illustration sim in hornresp?

(-not used Hornresp for BLH sim but have AJ)

Edited by freddi - 04 March 2007 at 1:13am
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moray james View Drop Down
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Joined: 07 September 2005
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Points: 141 		Post Options Post Options   Thanks (0) Thanks(0)   Quote moray james Quote  Post ReplyReply Direct Link To This Post Posted: 04 March 2007 at 2:02am
James I sent you a PM regarding this. Regards.
moray james
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cowanaudio View Drop Down
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Joined: 26 October 2004
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Points: 20 		Post Options Post Options   Thanks (0) Thanks(0)   Quote cowanaudio Quote  Post ReplyReply Direct Link To This Post Posted: 04 March 2007 at 3:34am

G'day Freddi

No overlays or eyeball summing of plots. If you model say a conical back loaded horn in Horn Response, and follow my rules in Moray's post, you will end up with a response that has a huge dip just above the low cutoff (Assuming your mouth is too small (no point doing a tapped horn if it isn't!))). If the peak either side of this dip is close to the same amplitude after adjusting horn/driver parameters, you will have a pretty good chance of ending up with a tapped horn that has two octaves of flat response. This method has successfully predicted the flatness, or amount of LF droop in 6 or 7 tapped horns I've built and measured. Using this method, I can guesstimate the final response to within a few dB. Now I'm not saying this method is foolproof, but it works for me.

 

Cheers

 

William Cowan
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freddi View Drop Down
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Joined: 13 December 2006
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Points: 60 		Post Options Post Options   Thanks (0) Thanks(0)   Quote freddi Quote  Post ReplyReply Direct Link To This Post Posted: 04 March 2007 at 12:12pm
Cool William! - are there TH alignments? - or is that hoping for too much-?

best,
Freddy

ps - there are variants which might be useful - such as seen in some Yorkville - wonder other than empirical how they're figured?



Edited by freddi - 04 March 2007 at 12:34pm
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