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I have decided recently to build a full horn speaker pair, likely 3 or 4 way. As of current I have a pair of Seos24 horns to play with and I'll be using those with the Radian 1.4" 745PB CD, I will test this combo in the 600-18khz range initially to see how it sounds and how flat I can EQ it. If I don't like the top end then I may add a CD or other tweeter above it, but more on that later.
What a beast!
I am also considering building some 18" JBL 40hz horns as well for the bottom end, we'll see.
I got some plans from John Inlow (he's been really great to work with!) for a 135hz horn that uses the B&C 12" 12PE32 midbass, I had to wrap my brain about how to build this thing and finally found a way to do it that I was comfortable with. Note a 12" compound sliding miter saw is a huge help. Since this is the first segmented horn I've built, I decided to build one prototype just to test some of my build techniques and also to see how it sounds and what the FR looks like. Again I only built one and this is by no means a final build, based on what I learned on this one I will be building 2 more with changes his weekend.
First I started with the compression chamber, the driver sits in about 1-2 liters of airspace, crazy I know! I started by ripping a piece of 5.5" wide stock with a 22degree angle on each side, basically a parallelogram. Then this piece goes in the chop saw, miter set to 22.5 degrees, I found if I can prop this piece up on the 22d angle then I can make the 22.5d cut and it automatically sets up the compound angle as well, which is around 43d
By setting up a stop you ensure each piece is identically long, just flip the piece top to bottom with each cut and you only need 8. I can literally build an octagonal box up to 5.5" tall in a matter of minutes now. I thought about how the hell to clamp these things and then I wondered if I could just tape them together...wala!
Unfolded, just run a bead of glue down each crotch face, wrap it up and tape. I put a flat board on top with some weight on it on a flat surface just to keep it totally square. Using the miter saw its easy to cut the top "cap piece" out as well. I also did a flat octagonal flange which I glued to the bottom of the chamber as a mounting flange. Now for the fun part, the actual horn! This is what I did on this first piece below, I will be making my final horns using a different technique (similar result) that is faster, easier and gives a little nicer result.
Basically I'll make sections with the miter saw using the compound angle feature, since the saw can cut up to 13" wide I can just build each horn in segments. First I traced out my sections and rough cut oversized versions. Then I made a template with some 1/2" plywood, I used this template to router flush cut each piece so they are all identical. Identical pieces are the key to making these horns!
Bottom flare
Top flare
Flush cutting the pieces
Then since I had already cut the primary angle, I just needed to cut the compound angle which I did with the table saw, about 41d for the lower flare and 43 for the upper
And boom!
I'm skipping a few steps but here is basically where things ended up
Hornresp modeled response
Actual response, not bad!
I am still breaking it in but wow is this efficient! Midbass is very fast and impactful like nothing I've ever heard, for fun I temporarily threw a DE250 and Seos12 in the mix and threw a 6db cap on it, not too bad! This is definitely a very lovable setup even w/o a sub, granted this is all hair left channel listening so far =)
More to come soon, let me know your thoughts and if you have any questions!
Thanks,
Javad
What a beast!
I am also considering building some 18" JBL 40hz horns as well for the bottom end, we'll see.
I got some plans from John Inlow (he's been really great to work with!) for a 135hz horn that uses the B&C 12" 12PE32 midbass, I had to wrap my brain about how to build this thing and finally found a way to do it that I was comfortable with. Note a 12" compound sliding miter saw is a huge help. Since this is the first segmented horn I've built, I decided to build one prototype just to test some of my build techniques and also to see how it sounds and what the FR looks like. Again I only built one and this is by no means a final build, based on what I learned on this one I will be building 2 more with changes his weekend.
First I started with the compression chamber, the driver sits in about 1-2 liters of airspace, crazy I know! I started by ripping a piece of 5.5" wide stock with a 22degree angle on each side, basically a parallelogram. Then this piece goes in the chop saw, miter set to 22.5 degrees, I found if I can prop this piece up on the 22d angle then I can make the 22.5d cut and it automatically sets up the compound angle as well, which is around 43d
By setting up a stop you ensure each piece is identically long, just flip the piece top to bottom with each cut and you only need 8. I can literally build an octagonal box up to 5.5" tall in a matter of minutes now. I thought about how the hell to clamp these things and then I wondered if I could just tape them together...wala!
Unfolded, just run a bead of glue down each crotch face, wrap it up and tape. I put a flat board on top with some weight on it on a flat surface just to keep it totally square. Using the miter saw its easy to cut the top "cap piece" out as well. I also did a flat octagonal flange which I glued to the bottom of the chamber as a mounting flange. Now for the fun part, the actual horn! This is what I did on this first piece below, I will be making my final horns using a different technique (similar result) that is faster, easier and gives a little nicer result.
Basically I'll make sections with the miter saw using the compound angle feature, since the saw can cut up to 13" wide I can just build each horn in segments. First I traced out my sections and rough cut oversized versions. Then I made a template with some 1/2" plywood, I used this template to router flush cut each piece so they are all identical. Identical pieces are the key to making these horns!
Bottom flare
Top flare
Flush cutting the pieces
Then since I had already cut the primary angle, I just needed to cut the compound angle which I did with the table saw, about 41d for the lower flare and 43 for the upper
And boom!
I'm skipping a few steps but here is basically where things ended up
Hornresp modeled response
Actual response, not bad!
I am still breaking it in but wow is this efficient! Midbass is very fast and impactful like nothing I've ever heard, for fun I temporarily threw a DE250 and Seos12 in the mix and threw a 6db cap on it, not too bad! This is definitely a very lovable setup even w/o a sub, granted this is all hair left channel listening so far =)
More to come soon, let me know your thoughts and if you have any questions!
Thanks,
Javad
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