Being a lazy sod, I have been wondering for while how a horn made from two quarters of a pipe would sound. Finally got around to it today, construction & measurements are very rough & ready, (and bear in mind I'm probably getting cancellation from the rear of the driver), but it looks like a reasonably broad boost is possible:
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can you give us some rough overall dimensions?
i'm guessing the width is round about 8 to 10 inches or 25 cm.
what size is the driver?
(and yup i'd like some bigger pic's)
i'm guessing the width is round about 8 to 10 inches or 25 cm.
what size is the driver?
(and yup i'd like some bigger pic's)
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ignore the blue line, the red one is FM white noise fed through the horn measured with an electet mic around a metre or so away.
The 6" driver is a out of a Yamaha 'subwoofer' bought from my favourite emporium, the 'side of the road'. it just happened to be the first 6" driver to hand.
I guessed the slot needed to be around 1/3 Sd, it's 4 Cm wide, determined by the piece of wood I picked up from my rubbish pile. Total width, determined by the piece of pipe to hand, is 43 Cm.
Routed out a circle from scrap and quartered it for the support for the horn wings. Height across the mouth is 23 Cm, depth 75mm.
The 6" driver is a out of a Yamaha 'subwoofer' bought from my favourite emporium, the 'side of the road'. it just happened to be the first 6" driver to hand.
I guessed the slot needed to be around 1/3 Sd, it's 4 Cm wide, determined by the piece of wood I picked up from my rubbish pile. Total width, determined by the piece of pipe to hand, is 43 Cm.
Routed out a circle from scrap and quartered it for the support for the horn wings. Height across the mouth is 23 Cm, depth 75mm.
I have a bunch of 6" & 8" drivers collected from above emporium which are just sitting around, so the vague plan is to make a pair of line arrays to use them up, inspired by the Danley SBH-10: SBH10 | Danley Sound Labs, Inc.
Using pipe flares & topped off with a piezo tweeter. The goal also is to spend as little as possible. The Missus just bought home a pile of ply from her work, so I'm nearly there....
Using pipe flares & topped off with a piezo tweeter. The goal also is to spend as little as possible. The Missus just bought home a pile of ply from her work, so I'm nearly there....
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A question for you guys: Does anyone know how to express the flare of circular cross section in the standard exponential horn equation form? The maths is beyond me..... it's been too long, not even sure how to express the question accurately.
