This picture is much clearer. Thanks!I always thought that slot-loaded was two drivers facing each other with the "slot" off to one side. This is six drivers, all facing downward, with the openings staggered between front and back. Originator Ralph Helmer used the phrase "modified carotid" at one time, I believe, but it could've been tongue in cheek on his part.
My thought is to use two drivers and have them exposed on two, if not all four, sides.
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Interesting read. I had heard the words "push-pull" used regarding the pictured woofer assembly, and the article explains why.
Not to veer too wildly off topic (like a 4 year old thread hasn't veered off topic), but would the dipole woofer arrangement below essentially need drivers that were good for open baffle? I suppose the only commonality between them and open baffle would be the total lack of cushion that's normally provided by an enclosure. NOTE: The three unseen woofers are open on the other side of the enclosure staggered a driver height lower.
I'm contemplating plagiarizing this design a bit and thinking that one of the open baffle favorites, like the Alpha 15, would be a good fit. Maybe a 12 inch rendition to shrink the footprint a bit.
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It would be nice if we could see them in order to judge for ourselves just how good they look.Hello all,
I found this place while surfing the web. Pretty cool.
So, I figured I'd show my OB setup as well.
The are a construction of stone, aluminium and plywood layered to create a very un-resonant and rigid baffle.
The stone is called Blue Barracuda quartzite, and it's only 6mm thick. So, no, they are not as heavy as you would think, they each weigh about 20-25 kg.
And yes, they do sound as good as they look.
How did you cut the holes in the stone?
It would be nice if we could see them in order to judge for ourselves just how good they look.
Damn, they are good looking.They were done by CNC water jet cutting.
Oops... sorry. I used the hosting from another place, but I guess if you are not registered there, the picture won't show.
Hopefully this will work this time:
I would definitely have to agree. You could start your own speaker line with something like that!Damn, they are good looking.
More Tang Bands. This time 1808's. Notch applied and there quite nice.View attachment 1087898
Nice! Sounds like we're following the same recipe. Welcome to AK.My first ever experimental attempt at 2 way OB sound after many iterations and playing with various full range drivers mostly 8' and 12". Since I started playing only the full range drivers, the attempts of adding a bass driver with an active crossover always mitigated the midrange magic so I had to think of a different way of playing the bass. It may sound silly or immature but it eventually came out really good. No compromise from 17K and well below 40Hz of room response. My idea was to drive the full range with no filter by tube and bass driver active amplified, solid state. The baffles are 30"X50", 18mm ply, mounted by 2'X2" solid wood chassis, held by steel brackets with hefty nuts and bolts. Full range driver is 100dB, 8 ohms and rolls off coz of baffle width below 100Hz and 97dB bass driver fed from a Miller & Kriesel sub amp crossed at 120 Hz and gets speaker level input from the Dynaco ST 35, which is driving the full range driver. The setup enables me to sometimes switch off the bass and just enjoy the FRD. Prior to my above experiment, I never knew that similar OB setups have been attempted with no filter driven FRDs in a 2 way. Nelson Pass slot loaded OB looks very interesting.