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In Reply to: RE: EV 1829 drivers - plug the back? posted by BofService on December 08, 2015 at 16:35:15
why not try it with dipole horns? I would think a very tight set of polar's on the front horn and a wide set of angles on the rear horn, give you that very cool spatial quality people love about dipole planer loudspeakers. By the way Karlson K-Tubes would be worth trying for this since they are 1/4 wave resonant devices you will end up with very compact units, but you won't be able to control the polar patterns as tightly as you could do with horns. Have fun. Best regards moray james.
moray james
Follow Ups:
A few decades ago I saw a system-of-the-month article in Stereo Review where this guy had moved into a large loft space. He had some unremembered large floor standing box speakers which were intended to be mounted near a wall, however they were going to have to be placed away from any walls in the loft. So he bought another pair, placed them back to back and reverse wired them, and he discussed how he felt this was better than original pair. I was'nt happy with the very narrow sweet spot I had with my EV horn rig at that time, so inspired by the article I got some Motorola peizos out of the junk box and gator clipped them in as rear firing tweeters to compliment the T350 front tweeters. And there was an improvement. Next came some better T35's swapped in for the rear firing tweeters. Next came rear firing mid horns and compression drivers, and this was better still. The 1829/1828 drivers would allow just one driver in this position however. Next came extra woofers driving rear firing mid bass horns to compliment the front bass horns. Even better still. At his point I'm reminded of a Bermuda Triangle legend where a lost pilot supposedly radio'd "Don't come after me! They look like theyre from outer space!".
Paul
I do have some home made k-tubes I could stick on them...Oh, hey, another nice surprise: The horns are University 8HDs. Unassuming looking but good down to 800Hz!
Edits: 12/10/15
B
If you're going to use the 8HD's as the front firing horn, try them with the long mouth dimension in the vertical position. While it may seen counter-intutive, they are diffraction horns and will have a broader coverage horizontally set up this way. I was ignorant of this and I had used them with the long dimension horizontal because they fit that way in my rig, and I never did care much for them. Freddy is the go-to-man for K-tubes. I tried some cardboard mock ups once, but found them rather beamy. They could work in the rear firing position.
Let us know how it goes
Paul
Quick update: Tried the drivers and (vertical) horns together using a passive crossover at about 1,100 Hz ('cause that is what I had handy). Sounded pretty good in the midrange but grainy up top. I'd like to try them down to about 800 Hz, then crossed to another driver above 3K or so, but don't have a crossover that will do that. I am getting closer to being able to tri-amp but not quite there yet.
Haven't tried the K-tubes on the back yet but will report back.
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