Bass Horn ??s

It has been along time since my last visit to this part of AF but i recently came into possesion of a Hi-q 15 sub. Never herd of them but it was gave to me and i'm not gonig to turn it down. I'm still trying to find more info on its capabilites. But i was wanting to know some more info on bass horns. I know i remeber reading that they are usally really but but u can cut them down to half the size for half of the effictives which was still real good. I remeber somthing bout the box had to be size of the hz u wanted to tune to or somthing. Hopfully whoever had that info and posted could help me. I was just wanting somthing to mess around with and put out some nice db or just sq for my house system.

Thanks

i think you are thinknig of TL....the transmission line has to be (preferably) 1/2 the wave length of the desired tuning frequincy, but 1/4 can work, just not as effectively, to save space.
here is what little i know about horns, not stating any of this as fact, just what i heave read and can rememver off of the top of my head...
Horns idealy are 1/4 as tall as the deisred tuning wave length (i beleive, just been tiddling on the net about them) and have to be 1/2 as long as the deisred wave length tuning and have to continuously be getting larger untill you reach the deisred size, their roll off slope is generally less than that of other enclosures so low low tuning isnt as vital as say, a ported enclsore. but they are generally HUGE.
to give you and idea of a TRUE bass horn, go to a rock concert, thoes big 10x10x10 black boxes by the stage.... thoes are TRUE bass horns...tuned pretty low (if you cant see the woofer, if you can see the woofer they are either ported or TL).
Bass horns are extremely efficent...as much as 24dB more efficent than an IB alignment. FYI that is 8 times MORE efficent...

here are a few links to true bass horns.
30Hz bass cabinet
http://vincent.brient.free.fr/bass_horn.htm

Even this is pretty bit (about the size of a big ported enclsore) and it has a -3@300Hz....
http://diy.cowanaudio.com/unity.html

I just got like bad headache from looking at all that. On the second link at the bottom his speaker system. He orderd thos subs with the 3 drivers correct? I tried to goto the link he had posted but it was down. http://www.lambdacoustics.com/ But ne way his system is talking bout kina building a mini bass horn that can still knock you sock off correct? i'd be intrested in seeing more of that brand/type if u know nehting bout that. That first link was F*CKED up that is one hell of a system.

Upon further inspections found a few good DIY bass horn/loudspeaker websties. Also stumbled upon a few JBL loudspeaker/bass horn packages so far no prices though.

Also did a froogle seach there are some true bass horns on there and some cabanets but i had another quick ?. http://www.activemusician.com/p/EM_D410T8.asp?ref=fg

Features

-Size 23"W x 23"H x 18.5"D
-Weight 90 lbs.
-Power/imp. 540 Watts RMS - 8 Ohm
-Speakers 4-EC 1060F Cast Frame & 1-E2700 Cast Bell Horn
-Crossover 18DB/Octave Auto-Comp.
-Sensitivity 105DB SPL @ 1w 1m
-Frequency Response +/- 2db 80hz to 14khz -6db @ 50hz

105db spl @ 1w 1 meter. So how does that work. sorry for all the ???s Also considering a DIY projection tv *not the crappy ebay ones that use frecel *sp* lenses.*

Upon further inspections found a few good DIY bass horn/loudspeaker websties. Also stumbled upon a few JBL loudspeaker/bass horn packages so far no prices though.

Also did a froogle seach there are some true bass horns on there and some cabanets but i had another quick ?. http://www.activemusician.com/p/EM_D410T8.asp?ref=fg

Features

-Size 23"W x 23"H x 18.5"D
-Weight 90 lbs.
-Power/imp. 540 Watts RMS - 8 Ohm
-Speakers 4-EC 1060F Cast Frame & 1-E2700 Cast Bell Horn
-Crossover 18DB/Octave Auto-Comp.
-Sensitivity 105DB SPL @ 1w 1m
-Frequency Response +/- 2db 80hz to 14khz -6db @ 50hz

105db spl @ 1w 1 meter. So how does that work. sorry for all the ???s Also considering a DIY projection tv *not the crappy ebay ones that use frecel *sp* lenses.*


lol, that's not a horn, and that's not a speaker setup that you want. That's a cabinet for a bass guitar, it plays a very limited frequency range very well, it can't go very low, it can't go very high....if you aren't going to be playing a bass guitar through this system then don't get that.

im a little confused, i was checking out the links to bass horns and i cant quiet figure out what makes it different that a typical ported box. other than the visual difference, what makes one different from the other?

same reason why a funnel is not the same as a hose and a megaphone is not the same as a pvc pipe

Something tells me you're jumping into the deep end of the ocean with horns... By far, they're probably the most complicated enclosures to design and build. If you want to take a stab at a design for your sub, try visiting http://www.users.bigpond.com/dmcbean/ and download Hornresp, which is a horn response analysis program that will predict your output and much more based on the driver, pathlengths, etc etc. I'm not sure if it supports folded horns or not... At any rate, good luck with that... The pathlength on a typical 15-inch sub would be rather large, so designing a horn to fit in a vehicle would be a challenge, to say the least...

If you visit www.billfitzmaurice.com and look up the design plans for the Autotuba, you'll notice his folded horns allow for all the benefits of having a horn-loaded sub in a small package. I'm actually in the process of building one myself, and based off the results I got from the Tuba24, I think this thing is gonna pound... It uses a single 8" driver in a folded horn design with final measurements at 14"x14"x32". Considering the driver itself is only worth about $30, and it supposedly outperforms two sealed 10" subs, I think it's pretty amazing... Anyhow, check out that site. There are some great designs, and they're fun - although challenging - to build.

im a little confused, i was checking out the links to bass horns and i cant quiet figure out what makes it different that a typical ported box. other than the visual difference, what makes one different from the other?

well for one most bass horns are rear loaded bass horns...which means you dont see the woofer, the woofer usually has a smaller sealed enclsore to pound agianst.
as for how a horn works, it is simple physics...to get an understanding....
go get a megaphone or a cone or w/e and a chunk of 4" PVC.... stand facing a wall, with the PVC yell through it towards the wall (brick prefeably) and note how loud it is. then use the mega phone.... if the 4" PVC was very long you may notice that the deeper frequincies in the harmonic that makes up your voice where louder than the higher frequncies. but, the megaphone was the loudest and if you where to do it with out anyhting it would be the quietest. think of your voice w/o the PVC or Megaphone as IB or Acoustic suspenison (sealed) and the PVC ported (TL actually) and the megaphone a horn. you can tune your voice by shortening the PVC to get it as loud as possible but the Megaphone should always be louder.
i could go into why a horn works best in amplifying sound, but you can google it or maybe even howstuffworks.com it.
but basically, as the sound waves travel down the cone the cone gradually gets larger, this makes the pressure changes more drastic, more drastic pressure changes means a larger/louder wave...
horns have been used for as long as we have been reproducing sound and even before. when thomas edison recourded "mary had a little lamb who's fleece what white as snow, and everywhere mary when the lab was sure to go" he used a horn to concentrate his voice on to a small diaphram hooked to a needle, when he played it back he used a horn to amplify the vibrations from the needle running over the inscribed cylender.... horns generally have the most natural responce and at most efficent...