hello rvrazvan,I can even wait to colaborate....we'll talk on the phone anyway...I can give you some advices on papier-mache tractrix horn buildings,I've build my own pair-about 70-80 cm diameter after the Inlow method...there are tar damped,there are some subtle technical details which I want to discust with you...now I have a pair of 15 multicellular horn(about 300 Hz)...
Maestro
apart from being hard to read, that writing style with capital letters is considered shouting
please dont
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Hi maestro,
I use a simple made glasfiber horn not extreme thick. This combination sounds warm indeed, not only in my ears also from others who listened. The reason good subbas extension to 20Hz very nice flat response of the 2" driver horn combo. Quality attenuation and use of good mkp capacitors.
You can use wood if you like and think that is the way you want to shape the sound.
horn response 0-15-30-45-60-90
I use a simple made glasfiber horn not extreme thick. This combination sounds warm indeed, not only in my ears also from others who listened. The reason good subbas extension to 20Hz very nice flat response of the 2" driver horn combo. Quality attenuation and use of good mkp capacitors.
You can use wood if you like and think that is the way you want to shape the sound.
horn response 0-15-30-45-60-90
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2 X 15" woofers on a openbaffle who play -3dB 30Hz 94dB 1wmtr average. After building this a came to understand that a OB does the best job dealing with room reflections or uses room reflections.
The rear wall reflection helps to extend the response down to 20Hz. with out it the -3dB point would be 40Hz. And you have a compact high efficient system even females aren't totally against it.
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Now I've supposed that it could be an OB but I've seen the front panel so narrow...but the rear wall helps of course....yes I know about the way that OB deal with reflections,anyway you have a low sound that is spacial,have good atack and decay and is free from box colorations and other distorsions implied in this...me personally,I've choose the horn route for midbass(piramidal 50 mm spruce horn) down to 70 HZ-with a 15'' woofer...I've just finishing my system so these days I'll put everything in it's place and start the game...I'll post one photo with the system...
The nearrow baffle is needed to get flat response at higher frequency above 600Hz.
I did backloaded horns the last 2010 102dB 1Wmtr it did even 45Hz. Stil not good enough its better to have response down to 30Hz then high efficiency IMO.http://www.diyaudio.com/forums/multi-way/170024-project-presentation-horn-almighty.html
When you use two of these 18" you will have efficiency and real subbas and the same behavior as a closed box low group delay.
http://www.eminence.com/pdf/Omega_Pro_18C.pdf
I did backloaded horns the last 2010 102dB 1Wmtr it did even 45Hz. Stil not good enough its better to have response down to 30Hz then high efficiency IMO.http://www.diyaudio.com/forums/multi-way/170024-project-presentation-horn-almighty.html
When you use two of these 18" you will have efficiency and real subbas and the same behavior as a closed box low group delay.
http://www.eminence.com/pdf/Omega_Pro_18C.pdf
An externally hosted image should be here but it was not working when we last tested it.
Midbass spruce wood front horn-Fc=70Hz | Flickr - Photo Sharing!
This is my new room(acustically untreated yet)with my system under construction,anyway close to finish...the multicells horns will be hanged up on the steel suports+ time domain alignement,etc....on highs there are the round tractrix wood horns which are not in the room now...
An externally hosted image should be here but it was not working when we last tested it.
My listening room...
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That's my conclusion as well. A 12" driver is generally pistonic up to about 1200Hz and there are plenty of 1" CD's with horns that will extend down to 1kHz or so. For the subterranean frequencies I plan on installing a 12" self powered sub in each cabinet. So, two 12" drivers and one good sized horn should be plenty good for me, all active crossovers of course. My plan is to have overall system sensitivity of about 100dB/w.
Please do not quote the entire post just above yours. I have removed most of the over-quotes.Please see this thread: http://www.diyaudio.com/forums/everything-else/203174-real-apology-andrew-t.html
Looks cool your horns.
You only have to build a tappedhorn sub woofer. Looks like you are in spired by Volvotreter. He also uses tappedhorn subwoofers.
For that you choose a driver with low Fs and big xmax and small Vas. Like car subwoofers. These make a great tapped horn.
A suggestion from my side Mivoc AW3000 great sub for tapped horn 50 euro.
You only have to build a tappedhorn sub woofer. Looks like you are in spired by Volvotreter. He also uses tappedhorn subwoofers.
For that you choose a driver with low Fs and big xmax and small Vas. Like car subwoofers. These make a great tapped horn.
A suggestion from my side Mivoc AW3000 great sub for tapped horn 50 euro.
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Maestro also thanks you inspired me to to think about the conical lowmid horn.
The speaker of my first karlson loudspeaker project made 1990. I still own the driver it is perfect suited. It is the BGS25NG, did a simulation it looks very promising.
It would make my system 10-15dB louder I use a 12W PSE hybrid tube amp. It would make a 115-120dB system ground shaking loud.
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For people who think this is cool I found even better driver you folks. US price 199 dollar.http://www.parts-express.com/pe/showdetl.cfm?Partnumber=290-591
Eminence 10" deltalite2510.
http://www.eminence.com/pdf/DeltaliteII_2510.pdf
It does even 60Hz in a small conical horn isn't that great, almost enough for hifi bas also. One spl is at 1/4 phi corner the more realistic one in a corner is the 1/2 phi sim.
1/2 PHI simulation this is what it would do in a cornerplacement (witch is 1/4PHI)
Eminence 10" deltalite2510.
http://www.eminence.com/pdf/DeltaliteII_2510.pdf
It does even 60Hz in a small conical horn isn't that great, almost enough for hifi bas also. One spl is at 1/4 phi corner the more realistic one in a corner is the 1/2 phi sim.
1/2 PHI simulation this is what it would do in a cornerplacement (witch is 1/4PHI)
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And here one for poor european guys.
Monacor spa12pa 45 euro. SPA-10PA PA-Basslautsprecher IMG STAGE LINE
Monacor spa12pa 45 euro. SPA-10PA PA-Basslautsprecher IMG STAGE LINE
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