Looking for a waveguide/ horn for an one inch driver crossed at 1200hz to a 12 inch woofer. These two has caught my attension:
18sound XT1086
Stereo-Lab 1000hz
Do anyone know the dispersion of the latter?
Which one would YOU choose?
18sound XT1086
Stereo-Lab 1000hz
Do anyone know the dispersion of the latter?
Which one would YOU choose?
The tractrix horn with it's 1000 HZ flare will not load much below around 1800 HZ, it's dispersion is 60 degrees. You will need the 400 flare horn they sell if you want to go down that low
The 18 Sound horn is a much better choice. They sound quite good and will load much better then the 1000 HZ flare horn in the 1200-2K range.
The 18 Sound horn is a much better choice. They sound quite good and will load much better then the 1000 HZ flare horn in the 1200-2K range.
Above those, I'd also consider the DDS ENG 1-90 Pro, if you can get it. Its limitations are directivity down to around 1.4-1.5 KHz and loading down to 800 Hz, but it's 90 degrees conical without any sort of diffraction device, and supposedly sounds very good. I've seen people very happy with it with B&C DE250 and BMS drivers. http://www.ddshorns.com/catalog.php?page=ENG190Pro
CLS said:It seems DDS got something very good. However, both DDS and Assistance Audio did not response to any of my emails
you can Buy them from here:
http://www.usspeaker.com/homepage.htm
look under horn.
I thought the flare rate was the frequenzy where the horn stopped loading.. What is good about tractrix horns and what is not? How important is constant coverage as long as the crossover frequenzy matches dispersion with the woofer?
I think I will avoid DDS after reading about several bad experiences concerning production quality lately.
I think I will avoid DDS after reading about several bad experiences concerning production quality lately.
Defo said:
It's the rate of expansion. Tractrix horns with compression drivers typically load well to a little under double the flare rate. Cone drivers sometimes can be used straight down to the flare rate in the midrange but require careful loading in the back chamber to get there.
I have seen claims of constant coverage horns but have never seen one work at a constant level. They all fall off off axis. The old multicells even do.
Tractrix horns are supposed to throw a spherical wave front. They tend to beam a bit but are most often noted for their lack of coloration and pin-point imaging.
A CD horn will have a bigger sweet spot but you will hear more of the room reflections. Pick your poison.
CLS said:It seems DDS got something very good. However, both DDS and Assistance Audio did not response to any of my emails
If I am not mistaken, USSpeaker gets their BMS, Ciare and DDS equipment via Assistance Audio.
I've never had a problem getting in contact with US Speaker, but Assistance Audio has been hit or miss.
Defo said:Looking for a waveguide/ horn for an one inch driver crossed at 1200hz to a 12 inch woofer. These two has caught my attension:
18sound XT1086
Stereo-Lab 1000hz
Do anyone know the dispersion of the latter?
Which one would YOU choose?
The measurements on the XT1086 are very nice. See the "horn vs waveguide" thread.
The XT1086 has a nasty diffraction device in the throat. I think that I would file it down if I were going to use it. That will make it symmetric. (It's smooth on the Y axis, but there's a "step" in the X axis.)
Re: Re: One inch waveguide/horn - which one?
I have a pair and don't see a "nasty diffraction" device in the throat. They sound great and have a nice smooth perfectly cast thoat.
Why would you mangle a well engineered, great sounding horn? HOM? These sound better to me without the foam.
I don't think filing it will make it symmetric either.
Patrick Bateman said:
I have a pair and don't see a "nasty diffraction" device in the throat. They sound great and have a nice smooth perfectly cast thoat.
Why would you mangle a well engineered, great sounding horn? HOM? These sound better to me without the foam.
I don't think filing it will make it symmetric either.
1200 Hz is a little to low, even with a steep filter.
At a very low cost, this waveguide can be used as a threaded insert-type OR modified for non-threaded insert:
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=270-312
It will get you to 1400 Hz (with a steep filter), which is pretty low. Pattern control down to this freq. is still viable and it's major diffraction signature "peeks" almost an octave lower.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=90804&perpage=25&pagenumber=5
At a very low cost, this waveguide can be used as a threaded insert-type OR modified for non-threaded insert:
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=270-312
It will get you to 1400 Hz (with a steep filter), which is pretty low. Pattern control down to this freq. is still viable and it's major diffraction signature "peeks" almost an octave lower.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=90804&perpage=25&pagenumber=5
Defo said:
Assuming an SD of 500, the woofer will begin to beam at 1389hz.
Here's the math:
(speed of sound/(((SD)/pi)^0.5)*2)
(13800inches/sec/(((500/6.45)/3.14159)^0.5)*2)
=1389hz
The shorthand way is to just take the speed of sound and divide it by the woofer's diameter.
Also, things like phase plugs and the woofer's inductance will affect this. Best idea is to do your own measurements.
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