Does anyone know the throat exit angles for either of these compression drivers? I notice that Parts Express is now carrying them and the price doesn't look too bad..
Hey Bill,
If no one here has one to measure, you can try e-mailing B&C. In the past they have been pretty good at getting back with me on such questions.
If no one here has one to measure, you can try e-mailing B&C. In the past they have been pretty good at getting back with me on such questions.
JLH,
Thanks for the word. I'd considered that but didn't think there was much chance of a reply. I'll drop them a line.
Thanks for the word. I'd considered that but didn't think there was much chance of a reply. I'll drop them a line.
I have a DE5 somewhere but don't have ability to measure it. If you want to borrow it when I find it, you are welcome to it.
Thanks for the offer Winslow! But I broke down yesterday and went up to Parts Express and picked up a pair of DE5s and had a look.
As far as I can tell, it doesn't have an exit angle in the normal way. The phase plug goes almost to the bug screen, no wall expansion at all.
It's really a surprisingly small driver, even after knowing the dimensions beforehand -- check the photo with some other stuff to compare for size
Should make the center of an interesting Synergy horn, to get the uhf radiation width. Here's a shot of it disassembled (sorry for the upside down pic, this is hard to post from a smartphone!)
As far as I can tell, it doesn't have an exit angle in the normal way. The phase plug goes almost to the bug screen, no wall expansion at all.
It's really a surprisingly small driver, even after knowing the dimensions beforehand -- check the photo with some other stuff to compare for size
Should make the center of an interesting Synergy horn, to get the uhf radiation width. Here's a shot of it disassembled (sorry for the upside down pic, this is hard to post from a smartphone!)
Yeah I took a piciture of mine next to a BMS 4540 (which is small) to show the size differences...it's over on PB's forum (which I don't think is up).
Probably the 2 inch Visaton FRS5-8 with a back cup for the high midrange. I've tried them in a Synergy test horn, they play pretty well, and don't need the areas in front of the cones milled out. (And not a buyout!)
Don't know yet about the low mid/bass, some kind of 8" or 10"driver. Maybe Visaton BG20-8 (with whizzer removed). Or FaitalPRO 10FE200.
Bill
If they don't respond to you then let me know. I know that they will respond to me because I have their home phone numbers!!
The US sales manager is visiting me tomorrow so I can also ask him.
Hey Bill
Yes, this is the case with many of these smaller drivers. There is no lead in chamber, just a phase plug. Since the phase plug does not taper into the throat there will be a lot of diffraction at that point which is why I won't use them. Cheap to make and to buy they just aren't worth it to me.
I have used a DE10 and it works well for a small driver.
Thanks for commenting, Earl.
Maybe I don't understand "the phase plug does not taper into the throat", but the front of the phase plug on this resembles a solid cone or sharp bullet that goes into the throat toward the connection point. Is that what you are picturing? The side walls up to that point, though, taper inward (as does the bullet plug, though that narrows faster) going toward the bugscreen, the overall passage area is increasing as the bugscreen is approached. At the end just before the bugscreen, the sidewalls straighten out somewhat gradually.
Bill
Maybe I don't understand "the phase plug does not taper into the throat", but the front of the phase plug on this resembles a solid cone or sharp bullet that goes into the throat toward the connection point. Is that what you are picturing? The side walls up to that point, though, taper inward (as does the bullet plug, though that narrows faster) going toward the bugscreen, the overall passage area is increasing as the bugscreen is approached. At the end just before the bugscreen, the sidewalls straighten out somewhat gradually.
Bill
I remember that now. The rate of expansion was very large and then it would narrow down as it enter the waveguide. This would not be a good idea. It should be one continuous curve without abrupt changes, which is true of a typical phase plug, but not the kind that you describe.
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