Somewhat similar to a bipole, I used six TC9FDs in a ring on each of my Cheap Half-Assed Omnidirectional Speakers. I'm very happy with them, though they don't get quite loud enough for me. They've convinced me that omni is worth serious experimentation; I'm planning a new pair, different design. It never ends...
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Very nice! How were you able to rear mount those drivers? Squeeze through the top access panel with a flexible shaft bolt driver? How did those Linaem tweeters work out?
Tell is more about the design - ported or MLTL or sealed? xO freq?
Mounting the drivers was a royal PITA. There's just enough room to get a hand down in there with a stubby screwdriver. It worked, but I wouldn't do it this way again. You really need removable baffles.
I've always liked the way the Linaeum tweeters sound, which is why I kept them all this time, waiting for something to do with them. I'm sure they don't measure well; and they're dipoles, so the sound from the rear of the speakers has some phase cancellation. I still like them.
The boxes are sealed. Crossover (active) is currently at 4kHz, which gets it out of the voice band, IMO a key to vocal clarity. I'll post a thread about them with build pics etc. when I get a chance.
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Voice is where the Vifa's really shine. I have Heil dipole AMT tweeters and really like how they sound. I thought you must have really small hands. 🙂
I see nothing halfassed about those. Cut in a sub or two and they will go much louder.
Why not put the x-over point much higher or not use the tweeter at all?
The Vifas have very good highs, esp. in an array where they are taxed a fraction. of what they would be in a one or two way setup.
There are lots of other reasons to choose a multiway system so your conclusion does not follow.
dave
I am running a sub, still playing with crossover points. I haven't tried running them without the tweeters; I have a soft spot for these tweeters but I'll give it a try. The half-assedness is mostly about not doing any simulations or even measurements. I just wanted to quickly knock together something that would let me experience omni sound. Fun stuff...
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Once the lower frequencies are taken out the cab is much less of an issue. Close it up and tune it with sandbags.
It's sealed and partly filled with sand.
I don't want to threadjack; I'll have a thread for these speakers soon.
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You have Vifa TC9FD's in your speaker so relatively on topic but looking forward to your new thread. Looks really interesting.
I did half of a hexagon and placed it next to a wall - works really well as a matrix single speaker stereo.
http://www.diyaudio.com/forums/full-range/223313-foam-core-board-speaker-enclosures-239.html#post3961261
What a great thread as 4 of those are waiting at the postal office for me.
Two of them are booked in one of xrk´s great cab-proposals as a present.
I subscribe here to not miss any idea for future builds.
Two of them are booked in one of xrk´s great cab-proposals as a present.
I subscribe here to not miss any idea for future builds.
That's neat. What does the impedance work out to with three drivers wired this way? I'm guessing 12 ohms, but I'm electronically impaired.
i can´t get this idea out of my had:
a minimalistic line array of sealed enclosures of four of them on each side of my tv.
each side with its own tap3116 class d amp.....
a minimalistic line array of sealed enclosures of four of them on each side of my tv.
each side with its own tap3116 class d amp.....
The simulations and measurements would surely have taken less time than the advanced way in which you mounted the drivers and the time you used to finish off the cab in such a nice way? ;-P
I think it is (8R-parallel-8R)-series-8ohms gives 12ohms. Note that bridge tied load (BTL) class D amps like 3116 cannot be used this way. Need a dumb class AB like a $5 TDA7297. Or if you want to have more oomph a 3886.