i would think that foamcore on formed ribs could produce that shape, templating it all would be a challenge/chore...something i'll have to try...
Or carve it out of glued up blocks of XPS, seal it with glue/epoxy, and add a block of plywood at the throat to give mounting screws for the CD to bite into.
That’s a cool horn and would be fun to make from curved foam core. Add latex caulk to back side to absorb vibrations else there is a lot of mechanical induced distortion.
Right now, I'm just going to try and round out the corners of the plates above and under the cardboard horn. Been thinking about it for a while as the straight edge in the middle annoys me when I look at it.
I can get bulk epoxy pretty cheap, so I could make a mold, and encase the back of the foam horn in epoxy to give it some weight.
That’s really good - have you blocked off the back radiator? Even a blanket can help to prevent back reflections from affecting polars. It looks too flat but that might just be because the cardboard horn works so well!
Still all 3 drivers on OB.
I put the speaker 2m away from the wall on one side, 5m to the other side, and there was about 4m behind the speaker... back reflection was pretty far away!
Mic was about 1m in front of the speaker, I tried to keep that distance at all angles.
It looks mighty flat indeed.... I re-did all measurements just in case, same results.
Probably why the sweet spot is so wide.
On a side note, it's the first horn I ever liked! Probably the open back makes it more airy. I never liked horns that shot the music at me. The radiating back wave makes it a lot better, to my ears anyway.
I put the speaker 2m away from the wall on one side, 5m to the other side, and there was about 4m behind the speaker... back reflection was pretty far away!
Mic was about 1m in front of the speaker, I tried to keep that distance at all angles.
It looks mighty flat indeed.... I re-did all measurements just in case, same results.
Probably why the sweet spot is so wide.
On a side note, it's the first horn I ever liked! Probably the open back makes it more airy. I never liked horns that shot the music at me. The radiating back wave makes it a lot better, to my ears anyway.
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It doesn't have a horn, but it does have "wings" at the back. The thinking was to not disturb the back wave from the SB65 with the back wave of the woofers. Wishful thinking? maybe.... 🙂
I don't like the square corners, so, I want to round out the corners.
well it certainly would be interesting to compare before and after rounding over.
so the top and bottom of the horn are parallel, what's the dimension?
so the top and bottom of the horn are parallel, what's the dimension?
I took some foam out of the corners, but it didn't do much overall.
The "horns" are 8cm x 30cm at the opening, and 10cm deep.
The "horns" are 8cm x 30cm at the opening, and 10cm deep.
They are still playing here! 🙂
I have done an XO for them, so I don't need the minidsp.
Haven't had time to finish them with wood.
Actually, I want to do more testing before I turn to wood.
I really should get back to working on them.
I have done an XO for them, so I don't need the minidsp.
Haven't had time to finish them with wood.
Actually, I want to do more testing before I turn to wood.
I really should get back to working on them.
Your problems with phase measurements may be caused by the very nature of a racetrack design when used horizontal as you have done.
Think of the racetrack as minor horns.
This is also why you have a very large sweetspot.
If you can, try a quick version with the racetracks vertical. Yes, your c-c is huge but then you can avoid that problem, you already have ... by crossing low as you have done!
Try it ... you may be surprised.
P🙂
Think of the racetrack as minor horns.
This is also why you have a very large sweetspot.
If you can, try a quick version with the racetracks vertical. Yes, your c-c is huge but then you can avoid that problem, you already have ... by crossing low as you have done!
Try it ... you may be surprised.
P🙂