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01-16-2011 Post does not mapped to Knowledge Tree
Tubebuilder
Deep in the outback of australia mate
Posts 9
Joined on 01-04-2011

Post #: 1
Post ID: 15431
Reply to: 15431
Mid Bass horns help with plans please.
fiogf49gjkf0d
Gday I am building a horn system. Ihave 2 sets of plans .

http://www.volvotreter.de/downloads/150Hz_Midbass_Tractrix_Horn_v1.3a.pdf this one is a 150

http://www.geocities.jp/arai401204/Download_Page/Download.html and this one is the first in this page link and I think it is a 190.

I believe they obey your rules rommy or as well as I understood them. I want to try my richard allan cg10 drivers. Wich are supa strong magnets and light cone that go to 5 k easy.I believe these are the specs

RE: 7.36
FS: 47
Qts: 0.33
Qes: 0.34
Qms: 10.46
VAS: 110 l.
Mmd: 18.8 gr.
Sd: 0.38 m2
DB 97.6



Sorry But I love being Audio Moron. Its so much fun building stupid irrational audio systems based on the fetishism of vintage audio parts.

Especially vintage tubes and open baffles and mostly horns of every shape and size.

I am over Evs I want to buy a table saw. I need some horns.
01-16-2011 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,540
Joined on 05-28-2004

Post #: 2
Post ID: 15436
Reply to: 15431
It is not how I see the things…
fiogf49gjkf0d
Tubebuilder,

I am not sure what you are trying to do.  According to the “Romy’s Rules” (whatever it means) people do not build Midbass horns but they build an installation that might include the Mid Bass horns. You do not need to choose a project just because you found some bogus building plans online. You need to visualize your future playback and define the specification for your Midbass horn. Then you need to test your specifications. Only after you feel comfortable with your requirement then you might choose what implementation it might be. I do not write at DiyAudio site where the Morons build brainlessly just because it is buildable. Building audio is like a building a high performance sport yacht. You can dump a bunch of wood in water and too see that it floats. However it will be very far from Hinckley sailing yachts..

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
01-17-2011 Post does not mapped to Knowledge Tree
Tubebuilder
Deep in the outback of australia mate
Posts 9
Joined on 01-04-2011

Post #: 3
Post ID: 15440
Reply to: 15436
Horn system specs
fiogf49gjkf0d
Hey Romy I read your requirements of a mid bass horn. I am using jabo tratrix KH-55A(320hz) with altec 288 and I want the mid bass to go under that. I would use a trattix round midbass if it was possible. But it's just not with in my abilitys to build. It is either that or go to reflex. I do have some 150hz lcleach wave guides I could use for midbass. But not being horns I thought a true horn would be more suitable. Perhaps it would be possible to build a chamber on the waveguide and turn it into a horn. It may sound similar to the jabo horn then. Amps will be the usaul stuff. 45se for the jabo maybe 47 sep for the midbass and 2e22 sep for the bass. all 2 stage with filters.


Sorry But I love being Audio Moron. Its so much fun building stupid irrational audio systems based on the fetishism of vintage audio parts.

Especially vintage tubes and open baffles and mostly horns of every shape and size.

I am over Evs I want to buy a table saw. I need some horns.
04-10-2011 Post does not mapped to Knowledge Tree
Tubebuilder
Deep in the outback of australia mate
Posts 9
Joined on 01-04-2011

Post #: 4
Post ID: 15973
Reply to: 15431
Still trying to work it out.
fiogf49gjkf0d

I am still here still trying to work it out. Read your mid bass horns article again. Learned a bit more. You right about open baffle I once foolishly sold everything I owned to buy a pair of km30. They never sounded good until one day almost by mistake I drove them with a amp that was low frequency limited to just above the baffle size I had them in. I couldn't believe what I was hearing. For the first time they came to life. I still don't get how people build all these open baffle speakers and drive them full range and say they sound good. I agree that open baffle are useless in small rooms too. I just read that bit about someone saying they are suitable.

Anyway I still haven't started building. I have been reading for 12 hours a day for A very long time it seems. I want to get to work on a mid bass horn. But I am still no closer to knowing what would work then when I started. I have changed my mind a hundred times. I am going to drive all my channels from one amp now (except the tapped horns) with out digital correction. Purists insist this is the way. I  still believe I will use tapped horns in the 50 to 100. My mid bass will be straight ~70hz horn. I was going to try get my compression drivers to go low but I have decided most likely I will build a cone low mid horn and then cross it at 1500 to a 1inch into a yet to be specified horn and then into a compression tweeter at 10k so no drivers are stressed.

I have some ev15 woofers and looking at a set of Goodman's audiom 80 woofers presently pondering if they would be suitable for mid bass duty's and a set of very beat up vitavox ak121 12" with a cracked frame even. But if the cones come out easy I could tig it up I think. I wonder if that would flatten the magnet though. There $200. I also have been collecting Philip's 12" drivers of different specs well pretty much all of them accept the Philip's AD 12202/M15 which I may snare tonite the most desirable because its the most efficient.(I didn't) What a waste of staying up all night. I will save my money for the Goodman's or vitavox I think. I wonder if these might make good horn drivers (Phillips)if I cut the whizzers off. They have big motors and light cones.  


I am weary so weary of endless study. Even though I know the closest thing to the truth is here I don't come too often as you are so cynical it discourages from keeping going. You hate OB, vintage guys,more art dude(god I hate him too. he is like a living ad trojan) You seem to hate most every thing. But you seem to be the most knowledgeable guy on earth willing to share your knowledge so freely which I am grateful for. And I like the way you filter through the BS so proficiently.

  I may be a audio moron unworthy of your time. But perhaps you could try to be patient and help me recover from my illness and build a Romy inspired horn system that works.
 
        Though I have to say I don't think I have hit rock bottom yet. I still enjoy fetish-sizing vintage gear. I opened a set of Mitsubishi 8" eas coaxial's this week. One had never been opened in 40 years. That really blew my mind. Are well maybe I will never build anything worth listening too . But I will keep reading and maybe when I come up with a plan you don't think is moronic I will start building. I payed 29$ each for them! How I could say no! The Eas coaxes this is!




Sorry But I love being Audio Moron. Its so much fun building stupid irrational audio systems based on the fetishism of vintage audio parts.

Especially vintage tubes and open baffles and mostly horns of every shape and size.

I am over Evs I want to buy a table saw. I need some horns.
04-11-2011 Post does not mapped to Knowledge Tree
noviygera


Chicago, IL
Posts 142
Joined on 06-12-2009

Post #: 5
Post ID: 16010
Reply to: 15973
Mid bass horns
fiogf49gjkf0d
TubeBuilder,

you wrote
>>>I have some ev15 woofers
You may be able to use them in Bruce Edgar 80Hz straight horns or better yet, he has a more properly proportioned 100Hz straight horns which are bigger than the 80Hz horns but have a higher cutoff. Talk to Bruce E. and ask him for some advice, he was very helpful last time I spoke to him.
Good luck.
Herman
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