tapped horn design

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   Finally managed to register on the forum What's with all the cookie securtiy issues?

I have built 5 boxes with this design. tried a couple of different 15" drivers by 18Sound and RCF and they both work well. B&C and PD do drivers that should work but they don't look as good value IMO. The drawing below is of the origninal prototype I did with all the bracing removed for clarity. The cabinet width is the same as a LAB Sub - you should be able to work the rest out for yourselves. It is difficult to model this - you really need BoxCAD although you can get an idea from using HornResp and MJK's TL spreadsheets.

Done a couple of dozen gigs with them including Brockie a few weeks ago. Sound is really good. Been using 2.5KW amp into each cab and 35Hz HPF without exceeding xmax. Planning a shootout against a few other designs in Bristol soon that I should get some accurate response plots for a stack of four from. PM me if you would like to come along.

Kudos to Tom Danley for the tapped horn concept and the range of products he has developed. I don't know how close this is to his designs internally but performance seems in the same ball park. Would never have built anything like this without relying on his work - so thanks 

cheers
Phil (AKA Snowflake)

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philpope Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 21 January 2007 Location: United Kingdom Status: Offline Points: 41	Post Options Post Reply Quote philpope Report Post Thanks(0) Quote Reply Topic: tapped horn design Posted: 21 January 2007 at 5:34pm
	Finally managed to register on the forum What's with all the cookie securtiy issues? I have built 5 boxes with this design. tried a couple of different 15" drivers by 18Sound and RCF and they both work well. B&C and PD do drivers that should work but they don't look as good value IMO. The drawing below is of the origninal prototype I did with all the bracing removed for clarity. The cabinet width is the same as a LAB Sub - you should be able to work the rest out for yourselves. It is difficult to model this - you really need BoxCAD although you can get an idea from using HornResp and MJK's TL spreadsheets. Done a couple of dozen gigs with them including Brockie a few weeks ago. Sound is really good. Been using 2.5KW amp into each cab and 35Hz HPF without exceeding xmax. Planning a shootout against a few other designs in Bristol soon that I should get some accurate response plots for a stack of four from. PM me if you would like to come along. Kudos to Tom Danley for the tapped horn concept and the range of products he has developed. I don't know how close this is to his designs internally but performance seems in the same ball park. Would never have built anything like this without relying on his work - so thanks cheers Phil (AKA Snowflake)

james folkes Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 08 January 2005 Location: United Kingdom Status: Offline Points: 3064	Post Options Post Reply Quote james folkes Report Post Thanks(0) Quote Reply Posted: 21 January 2007 at 6:42pm
	thankyou phil, glad you felt you could share this in the end. i am intrigued by the way the horn still opertates as would befit it's significant length, even though the driver doesn't play into the conventional throat area... gives me plenty of food for thought for v2 giatt, but from what you were saying i've certainly got to try one of these as soon as possible! this has reminded me. drivers, i shall sort it tomorrow phil... ta. james.
	mardy hippy.

tb_mike Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 01 October 2004 Location: New Zealand Status: Offline Points: 2744	Post Options Post Reply Quote tb_mike Report Post Thanks(0) Quote Reply Posted: 21 January 2007 at 8:51pm
	Snailshell scoop! Yep you can position the driver a wee way down the 'pipe' and it still works. Sometimes it doesnt look like it though.

login4 Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 03 April 2006 Location: Wales Status: Offline Points: 1552	Post Options Post Reply Quote login4 Report Post Thanks(0) Quote Reply Posted: 22 January 2007 at 1:06pm
	ye i like it, nice and simple to make, right angles and not too many others, it will be intresting to see what people think of it...
	CELTIC SUBSONIC SOUND SYSTEMS

moray james Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 September 2005 Location: Canada Status: Offline Points: 141	Post Options Post Reply Quote moray james Report Post Thanks(0) Quote Reply Posted: 27 January 2007 at 5:12pm
	Can you provide dimensions and information about what drivers you have used (what worked best) and can you post measurements?
	moray james

freddi Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 13 December 2006 Location: United Kingdom Status: Offline Points: 60	Post Options Post Reply Quote freddi Report Post Thanks(0) Quote Reply Posted: 28 January 2007 at 11:18am
	hey Phil so dims will work @22.5" wide and scaled to 15" frame reference? a few questions: (1) does that first bit of snail action act as a smoothing resonator trap? (2) might B&C 15tbx40 be ok? (3) can AJ calculate mutual load cases? Tom Danley can figure out stuff. Best, Freddy Edited by freddi - 28 January 2007 at 1:11pm

philpope Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 21 January 2007 Location: United Kingdom Status: Offline Points: 41	Post Options Post Reply Quote philpope Report Post Thanks(0) Quote Reply Posted: 28 January 2007 at 2:15pm
	you are right about the dimensions and I have made the throat (where the driver enters) equal to Sd. not sure what you mean by resonator trap - it's more than just a LPF though. I can't see any reason why that B&C driver wouldn't work. It has plenty of xmax and motor strength and moving mass look about right. I don't know a lot about AJ horn but don't think there is any way of modelling this enclosure. I would be delighted to find out otherwise. I will post measurements using at least two different drivers as soon as I have them. cheers Phil

freddi Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 13 December 2006 Location: United Kingdom Status: Offline Points: 60	Post Options Post Reply Quote freddi Report Post Thanks(0) Quote Reply Posted: 28 January 2007 at 3:20pm
	Hi Phil - someone mentioned they 'thought" BoxCad could do it (?) did you figue lowpass from past horn experiences?-empirically - just wonder how its calculated forgot to ask - what's ~sensitivity? Best, Freddy ps - AJ 5 says something to the effect driver can be moved - might this imply there's enough mobility for transflex? http://www.aj-systems.de/newfeat.htm Edited by freddi - 28 January 2007 at 3:34pm

philpope Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 21 January 2007 Location: United Kingdom Status: Offline Points: 41	Post Options Post Reply Quote philpope Report Post Thanks(0) Quote Reply Posted: 28 January 2007 at 3:48pm
	apparently BoxCAD can model it. I am trying to decide whether I have $300 to spend to find out. not sure what you are asking about lowpass. sensitivity is a shade under 105dB from 40 to 90Hz after which it rises steeply to over 110dB if you can offset the driver in AJ then it will be a better model than in Hornresp. Martin King has done an offset driver TL worksheet that will do this too. Phil

freddi Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 13 December 2006 Location: United Kingdom Status: Offline Points: 60	Post Options Post Reply Quote freddi Report Post Thanks(0) Quote Reply Posted: 28 January 2007 at 4:31pm
	Hey Phil ordered AJ so will find out - you're getting good output and appears mouth constants aren't too tight for TD's principle to work. couple of questions (1) what did your hornresp input and output data look like? (2) how did you make a first estimate of what might work well and smoothly without full modeling capibilities? - how might one pick things for a new horn? (2) how far does this horn seem to extend upwards before things get rough? Freddy Edited by freddi - 29 January 2007 at 9:05am

moray james Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 September 2005 Location: Canada Status: Offline Points: 141	Post Options Post Reply Quote moray james Report Post Thanks(0) Quote Reply Posted: 30 January 2007 at 9:11pm
	William Cowan has posted some very useful information on the Tapped Horn at his web site. Check it out. http://diy.cowanaudio.com/
	moray james

freddi Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 13 December 2006 Location: United Kingdom Status: Offline Points: 60	Post Options Post Reply Quote freddi Report Post Thanks(0) Quote Reply Posted: 30 January 2007 at 11:53pm
	that's cool and one slanted panel looks like a good way to go and save cutting :^ not sure if that would apply to K-son as aperture leak might ruin the T-H's action (?) and also result might not be pure K Edited by freddi - 30 January 2007 at 11:55pm