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Old 6th May 2010, 09:51 PM   #31
Dogue is offline Dogue  United States
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Quote:
Originally Posted by Ron E View Post
Why not just mount your pair of eminence speakers with a back corner together and the fronts facing at different angles? If this gets you what you want, think about DIY...
Interestingly (if I'm understanding you correctly), that's actually along the same lines but more extreme than the keyboard amp I'm using (Motion Sound)

Though in the amp it's a pseudo-stereo effect the efficacy of which is partially dependent upon one's position in relation to the amp.

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Originally Posted by MaVo View Post
Maybe something like this? Solid Acoustics dodecahedron speakers Should solve the low spl problem of fullrangers, since you will use 12
This is similar in concept to the hemispherical speaker unit I posted earlier. At this point perhaps I should mention that I have one of those hemispherical speakers buried in a closet. Maybe I should give it another try. As I recall it uses 6 Polk 5-1/4" car audio coaxial speakers in a serial/parallel configuration.

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Originally Posted by el`Ol View Post
I just see the Tangband W8-1772 is much cheaper in the US than over here.
Parts-Express.com:Tang Band W8-1772B 8" Neodymium Full Range Driver | Tang Band W8-1772 8" Full Range Driver full range tb speakers neodymium driver line array point source midrange home theater computer speaker center channel set tube amplifier
It has a strongly rising frequency response, good for ceiling flooding. Displacement is more than usual for a fullrange driver, and with an enclosure size of merely 40 l a BR should do the 60 Hz. Port dimensions would be 4" diameter, 5" length. I took the measurement data of the K+T magazine, where the Qts is a bit higher than the value published by the manufacturer. Sensitivity is comparable with the Alpha-8 and two of these enclosures are still quite small. It has 60 W max, not RMS, but if your music has dynamics and you don't use the amps to fight loudness wars this should be OK.
The neodymium magnet should help keep the weight down, and an enclosure of that size in Baltic birch should be around 10 lbs. Add in a pound or two for the amp and it's a lightweight and portable solution. And you think it would work well without a diffuser? Thanks again.
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Old 7th May 2010, 06:57 AM   #32
el`Ol is offline el`Ol  Germany
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From the frequency response I am quite sure it works without a diffusor, given that you stay below the 20 ms for the ceiling reflection. Also sounds strange in the absolute near field (distance to the listener < half the distance to the ceiling. If you try with a diffuser you need a partially absorptive one to get the treble down. For the HX201 I tried a 90 paper cone filled with mounting foam and it worked.
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Old 7th May 2010, 08:17 AM   #33
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Why not do something like the classic Leslie organ speakers, maybe without the rotating effect though? Leslies may well be the worst sounding speakers you'll ever hear, but they do distribute the sound all over the room. They have a large woofer pointing downwards into a smaller cabinet that have vents on all sides. Below 1 kHz they are more or less omni because of this. On the top there is single driver with a double horn, pointing in opposite directions. You could use two horn tweeters and achieve kind of the same thing.
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Old 8th May 2010, 09:24 AM   #34
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I've got a Leslie sitting in my living room and I have to say that firstly the woofer does point downwards but into a short rotating scoop with a 90deg bend in it and secondly one half of the 'double horn' is a dummy (ie it is blocked off), it is merely there to balance the rotating mass.
Btw Leslies are beautiful sounding speakers if used with an organ or electric guitar. They are an effect, not a speaker for accurate reproduction by any stretch of the imagination and have virtually no output above 6kHz. Mine does however has got a very nice sounding 45w mono valve amp in it.
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Old 8th May 2010, 08:05 PM   #35
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True, there is only one "active" tweeter horn on the Leslie (my mistake..), but when the horn rotates it spreads the sound all over the room, and thats the point. Without any rotation the speaker will not do that, so two (or more) horns should be better I think. When the Leslie bass rotor is off, the woofer is more of less omni.

Leslies sounds great with an organ of course, my favourite is the Hammond A100.... simply beautilful.
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Old 12th May 2010, 04:40 AM   #36
freddi is offline freddi  United States
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on the cheap at Ebay there's a wideband Sammi 8" with whizzer 390109337367 - - its reference efficiency is about 2.2%, it has a 2" coil and is ~$20 sans shipping - there's not a lot of high frequencies above 5KHz but might be sufficient. I would think smaller voice coil fullrange could fry fast and compress - I burnt a WBAL with 25 watts by going out of a room and the cd changer moved from a wide dynamic cd.

here's the Sammi in a klam - it had another 6-8db to go http://www.youtube.com/watch?v=znfE7hjQ40o

Last edited by freddi; 12th May 2010 at 04:42 AM.
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Old 16th May 2010, 03:09 AM   #37
ScottG is offline ScottG  United States
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Reckhorn C-190 Koaxiallautsprecher - profi hifi Vertriebsgesellschaft m.b.H.
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Old 16th May 2010, 02:58 PM   #38
freddi is offline freddi  United States
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C-190 = CooL ! thanks
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Old 27th May 2010, 06:59 AM   #39
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Just reread this thread in a search for info on the Beyma 12GA50>In addition to all this driver talk, the OP wants a lightweight solution; perhaps this diy composite cabinet type is a nice option to meet that requirement.

Click the image to open in full size.
Foam core/plexiglass+carbon shell. For those with stiffness/resonance doubts about this method, it's the same composite method with which an airplane can be built.

I think it's a stunning cabinet construction option.

Last edited by voltcontrol; 27th May 2010 at 07:03 AM.
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