Was that store Freedom Electronics on Lake Street by chance?
They had a fiberglass straight horn on display around 1974 that sounds like what you describe, though I remember it as being a circular exit.
They also used to sell "troffs", a short fiberglass horn used for two 12'' or 15'' which used a hog feeding trough as the mold.
Rechi (sp?) Engineering made the "troffs" and a bunch of JBL horn copies for them.
A little more on topic, the old RCA folded "W" bins had no rear chamber.
That said, a long straight horn with no rear chamber probably would not be a good idea, as there would be two distinct sound sources at the upper frequencies.
I think it's going to be a lot more than that. You can't just butt joint them together. You will need at least 2 layers overlaid and overlapped, so throw in a case of construction adhesive as well. And then some type of flooring material on top of that if you want it to look good. And unless you use extensive bracing to hold it up (which would look bad) it's going to need to be at least 2 inches thick, since there are large areas held up and stabilized by only the round middle section.
This would be a big and expensive job to do right, otherwise it's going to be very weak and floppy and look terrible.
Yeah...it'd almost be easier to chip out foundation like that one picture that's floating around of that man in Italy that carved horns into his basement floor.
If I thought I was going to live in this house forever I'd be all over that idea.
I will be building mine behind the room, coming into the room at the base from outside. I will probably only use 4 sheets of ply( as form work) as i will build mine from concrete.
Will start a build thread later.
Will start a build thread later.
You should take a look at Romy's loft mounted bass horns.
GoodSoundClub - Romy the Cat's Audio Site - OK, they are ready to fly tomorrow.
GoodSoundClub - Romy the Cat's Audio Site - OK, they are ready to fly tomorrow.
Is there a report on the outcome of Romy's bass horn build?
I only get to see that one linked page.
I only get to see that one linked page.
So far in my reading, he doesn't really say, he seems to be wishy-washy back and forth about different issues, and resorts to mostly talking about his midbass horns.
From the looks of the last FR graph that was shown, it's not really much of a subwoofer with the vitavox drivers he's using anyway, he's only down into the mid 40's as far as I can tell, unless I just haven't read enough of the thread yet.
Edit: It would appear he built it as a midbass horn, it's not even supposed to be a subwoofer.
I designed and started to build (3years and no further progress) a bass horn into my loft space.
It is to be 28feet long and nearly 40sq ft mouth feeding into ½pi space (corner mounted)
I can see from his pics that Romy's horn is very much smaller and could never perform down to 20Hz.
It was the phasing issue I was interested in, since his bass drivers are so much further away from his listening position. Mine will be worse if I ever get around to completion.
It is to be 28feet long and nearly 40sq ft mouth feeding into ½pi space (corner mounted)
I can see from his pics that Romy's horn is very much smaller and could never perform down to 20Hz.
It was the phasing issue I was interested in, since his bass drivers are so much further away from his listening position. Mine will be worse if I ever get around to completion.
The distances are actually pretty close to the same. The main front speakers are about the same distance from the listening position as the loft mounted horns. Well, something within about 1/4 wave length at the crossover point.
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