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A midrange horn project - opinions and proposals
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_djk_ View Drop Down
Old Croc
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Joined: 23 November 2004
Location: United States
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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: 03 September 2008 at 6:40am
"is the horn 'extended' by the foam, or does it line the horn? And is it open or closed cell? I can't tell, sorry. "
 
The foam is 30-PPI open cell and there is a solid wall of the horn behind it.
 
"No, djk designs his horns.

And...those mids are massive "
 
About 48" wide. They had a space frame (like the newer JBL HLA rigs), so they weren't heavy, just big.
 
The first pair of those I built started out with dual 15" drivers, this was OK as I was 4-way with phenolic compression drivers. Later, I changed them to 12s so they could go high enough to go 3-way with metal compression drivers.


Edited by _djk_ - 03 September 2008 at 6:49am
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technofreak View Drop Down
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Joined: 24 August 2008
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Points: 74 		Post Options Post Options   Thanks (0) Thanks(0)   Quote technofreak Quote  Post ReplyReply Direct Link To This Post Posted: 03 September 2008 at 8:53am
OK, seems like my ideas would work, right? So, after I get my salary, I´ll start building ASAP and post some pics here too.
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tb_mike View Drop Down
Old Croc
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Joined: 01 October 2004
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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: 03 September 2008 at 8:58pm
technofreak - it looks as if youve read the good papers and the best thing to do now is to  build :-D! Did you see JBL CMCD(?)  technote regarding direct radiator vs 6" cone mid.
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doober View Drop Down
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Joined: 03 January 2006
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Points: 1123 		Post Options Post Options   Thanks (0) Thanks(0)   Quote doober Quote  Post ReplyReply Direct Link To This Post Posted: 03 September 2008 at 10:08pm
Originally posted by technofreak technofreak wrote:

. I got the foam idea from reading about an experiment where you make an improvised horn fom a rolled up magazine, talk into it and compare the sound with and without mouth termination made of a towel that is rolled up and wrapped around mouth.


Can someone post the link to this article? I'm sure I saw it recently but I can't find it now.


Kieran

Blahblahblah
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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: 04 September 2008 at 8:43am
Jack Bouska on lansingheritage:
http://www.audioheritage.org/vbulletin/showthread.php?t=12967
Away on extended leave.
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doober View Drop Down
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Joined: 03 January 2006
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Points: 1123 		Post Options Post Options   Thanks (0) Thanks(0)   Quote doober Quote  Post ReplyReply Direct Link To This Post Posted: 04 September 2008 at 4:03pm


Thanks Deadbeat, that'll keep me entertained this evening.
Blahblahblah
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technofreak View Drop Down
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Joined: 24 August 2008
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Points: 74 		Post Options Post Options   Thanks (0) Thanks(0)   Quote technofreak Quote  Post ReplyReply Direct Link To This Post Posted: 25 September 2008 at 6:37pm
Hi all,

Due to the economy going south here I have suspended the horn project (this would have cost me ~200€ for materials and carpenter, since I don't have tools or room for such things) for time being. But I certainly WILL build them one day!

For now I put the Alphas in small sealed boxes and called it a day. With those old double-8" they make great compact DJ monitors, micro rig for house parties and very loud hi-fi speakers - played the system at full blast yesterday and that was ridiculous in my 20 sq. meters room, I actually started to feel bass with my hair! The amp is 200W/ch at 4 ohms. Here are some pics of the stuff.

I used a cheap 2€ computer mic to get some idea of the freq. response - pretty flat from 50 Hz to 10 kHz, starts to roll off after that. I don't know what to blame more - the mic or the piezo tweeter, probably both are equally quilty. Slight EQ-ing of the top octave is required. The piezos are those 1€ things, slightly modified - added some wadding behind the diafragm, of course proper filter is applied (8,2 ohm 10W resistor across terminals, 1,5 uF cap in series and another 8,2 ohm 10 W resistor in series with all this). No harshness at 5 kHz. Alpha is rolled off at 5,8 kHz w/ 0,22 mH inductor and high-passed w/ 68 uF cap. Eight-inchers are low-passed w/ 3 mH inductor. It all works pretty well, though using 2. order x-overs would be better - the excursion of Alphas gets quite high, although doesn't exceed X-max.

I deliberately left so much room around the three sides of piezo - so I can fit some smaller proper HF horns if I wanted to.
It's techno and it's freak
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tommysb View Drop Down
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Points: 1036 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post Posted: 25 September 2008 at 11:54pm
Good to see. I love your Burberry Computer chair, and huge vodka bottle under the desk! Are all women in Estonia as beautiful as I've been lead to believe?

Tom
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technofreak View Drop Down
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Points: 74 		Post Options Post Options   Thanks (0) Thanks(0)   Quote technofreak Quote  Post ReplyReply Direct Link To This Post Posted: 26 September 2008 at 11:37am
Originally posted by tommysb tommysb wrote:

Good to see. I love your Burberry Computer chair, and huge vodka bottle under the desk! Are all women in Estonia as beautiful as I've been lead to believe?

Tom


This chair is comfortable as hellClap. The vodka bottle wasn't emptied by me or my friends, we found it in a forest during a hike. No idea why we carried it all the way, it was empty, you knowLOL Must be crazy green thinking people... And yes, women here are really beautifulTongue
It's techno and it's freak
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