**terra horn**

from the soundcheck thread..

yep, its my own "little" beastie, 3.4m "supercurved" smooth constant expansion 26hz fc hyperbolic horn, loaded with pd1850, taken best part of a year learning about horns and reading the wise words of other whilst loitering round places like this.. and then the cutting... let alone design n learning autocad etc

anyway yep we like our noise, but it was tested at points, as much as could be done with a bridged peavey cs1000

i did wonder if anyone here would have noticed hehe

i'm sure theres a few that may b interested, trying to get construcion photos sorted on a website.. maybe start next week

al

well, they have a large mouth (only built one so far tho) and i designed them to work in pairs side by side or for a bit of serius bass with four; on their sides, two on bottom two on top. having said that one seemed really good with a bit of eq in 2pi, so should be absolutely fine in 0.5pi due to boundary reinforcement and cabin gain.

oh and it took 3-4 of us to move them cos i hadnt had time to put handles on yet.. hopefully tonight, when theres enugh of us at home to lift it back up the stairs from the van

the only problems with a stack of four on their side would be u cant sit in the middle, which was very nice indeed. (30hz massage at 130+db 18mm from your back, lying down in one) and everything needs strapping down, or they might walk away..

here is a cad screenshot. the red line is disecting the outer center of the rear chamber.. the horn profile and this rear chamber section are cut from one sheet of ply per side.

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or http://img205.echo.cx/img205/1898/terrahorn7ie.png

its not teknically folded as such,  you can see its curved around the 2 corners, i havnt read any research,  but as far as i can imagine sound waves can propagate with less friction/turbulance or eddys round a smoothed corner rather than the bp effect of right angled corners in most folded horns.. dont forget standing waves and back reflections too, reducing efficiency.. which isnt taken into account in horn response... this may even lead to the possibility of a much higher crossover point if so desired, because it more resembles a "warped" straight horn. i havnt as yet tried it above 90hz.

got loadsa photos, but theyre all on my gf computer.. half in sequence of construction. still waiting for slide film of the horns escapades at the teknival to come back..

@ timber, yep i'm sure your right talking wavelengths, but have you ever tried tugging a ratchet strap round a 180 degree panel, then around a smoothed curve.. i can imagine pushing air being the same: less friction and turbulance and reflections.

anyway it is kind of less practical but looks the  bollox, and is less "compromised" 

@mike i'll get some photos sorted soon