Scottmoose and planet10, this is for us.

[Cal Weldon]

[TerryO]

OK Cal,
I'm hooked, what's the story?

Best Regards,
TerryO

[Scottmoose]

Nice one Cal. Of course, the question is, how do they sound? To the best of my knowledge, this geometry is unique (to say nothing of the alignment, or the driver positioning... ;-) so I'd be interested to hear about your impressions of them.

Terry -I'll leave the full thing to Cal, but briefly, Dave & I have been working on double horn designs over the past year, of two sorts. First, BVR (Big Vent Reflex; large chamber, short rapidly flaring waveguide type of horn[s]) and Nagaoka style stepped expansion long-path types. Cal asked if we could do something for 2 CSS WR125 drivers (preferably a little different or novel) & this is what we / I came up with. It's a BVR with EBS alignment, & Nagaoka stepped expansion, one driver facing forward, the other sideways.

[Geoff H]

Cal, what's happened? You usually have horns in front of drivers.

He's a sly devil you know. Only last week I said there'd be nothing around Cal's shed needing BSC.

[Cal Weldon]

It's amazing how well one sleeps after a night like that.

Originally posted by TerryO
what's the story?

See below

Originally posted by Scottmoose
how do they sound?

Very nice thanks to you.

And Dave.

[i]Terry -I'll leave the full thing to Cal, but briefly, Dave & I have been working on double horn designs over the past year, of two sorts. First, BVR (Big Vent Reflex; large chamber, short rapidly flaring waveguide type of horn[s]) and Nagaoka style stepped expansion long-path types. Cal asked if we could do something for 2 CSS WR125 drivers (preferably a little different or novel) & this is what we / I came up with. It's a BVR with EBS alignment, & Nagaoka stepped expansion, one driver facing forward, the other sideways. [/B]

SQ and aesthetics in one package

Originally posted by Geoff H
Cal, what's happened? You usually have horns in front of drivers.

Oops.

[i]He's a sly devil you know. Only last week I said there'd be nothing around Cal's shed needing BSC. [/B]

Two wr's and a couple horn loaded ports pretty much eliminates the need for bsc even with the very narrow baffle. The sound is nicely balanced.

I have the wr's running full range and the TB tweeter with a 1 mfd cap and some padding. The ports are lightly stuffed.

The wr's have finally found a home. This is the first alignment I have been happy with. They have been a frustrating driver to work with but not anymore, thanks to Scott and Dave.

A truly satisfying project.

[Scottmoose]

Excellent! I was sure they'd be fine, as MathCad doesn't lie, but the proof is always in the listening. Heck of a fast build that too Cal -it's only about 10 days back that we did these isn't it?! I'm really glad you like them. If anyone's interested, the design should appear in the Spawn Horn section of www.frugal-horn.com fairly soon. They're not a hard build.

[Pano]

So which way do you point them?

[Cal Weldon]

Any direction that sounds good I guess. Tweeter toward the front has worked nicely so far.

I have recently added a powered Extremis to the mix. I like.

Scott, I think we have something more to discuss. Perhaps a matching dual Extremis box? I've already put the bug in Dave's ear.

Might as well keep going

[Cal Weldon]

Originally posted by panomaniac
So which way do you point them?

Toward Haleakala.

I have been experimenting with moving them around and swapping sides and the results are sure interesting. So far, spacing them a fair ways apart and having the side drivers inward has created a nice stage presence. Close together with the side drivers out has a certain airiness (airyness?). Sure gets rid of the problem of having them on the same baffle with the high XO point.

Haven't snuck them inside yet to play with the walls and corners but maybe Sonia will go shopping tomorrow...

[planet10]

Originally posted by Geoff H
Only last week I said there'd be nothing around Cal's shed needing BSC.

Think of the side firing WR125 as active BSC.

dave

PS: i just linked the plans on the spawn page

http://www.frugal-horn.com/spawn.html