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Multi-Way Conventional loudspeakers with crossovers

New guy here... and a new idea.
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Old 2nd January 2011, 09:51 PM   #1
Vela is offline Vela  Croatia
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Default New guy here... and a new idea.

I'm interested in your opinions about this potential project of mine...
The rendering was done by a good friend of mine Kresimir Jelusic, and is great but allot of specific details are missing... This is just a concept. The tweeter would be true ribbon, and at the back is the opening for a spiral horn.
The suspension is missing and a special mount for vertical tilt. I hope this is a good introduction...
What do you guys think?
Cheers!
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Old 3rd January 2011, 03:06 AM   #2
bob123 is offline bob123  United Kingdom
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Nice art work! Looks tricky to make.
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Old 3rd January 2011, 08:08 AM   #3
Vela is offline Vela  Croatia
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Yes... I know... that's why I haven't yet. I've had this Idea for more than 10 years already. I should be done with ring shaped MDF with pyramids on the inner side. Screwed and glued and then shaped on a lathe. The catch is, these "eggs" are big, maybe a meter in length? So I suspect they would be really heavy. Plus, I don't have any experience with spiral horn yet.
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Old 3rd January 2011, 09:01 AM   #4
supercharged is offline supercharged  United Kingdom
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it looks brilliant, construction wise I would head towards composites. they could be made extremely rigid, with voids for loading with your choice of damping material.
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Old 3rd January 2011, 02:14 PM   #5
Pano is offline Pano  United States
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New guy here... and a new idea.
Very pretty!

Would bass notes get this swinging back and forth on those thin wires?
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Old 3rd January 2011, 03:27 PM   #6
klm1 is offline klm1  United States
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Default Maybe...

a two piece shell, with an insert for the spiral?

steel cable/wire for the suspension(unless you wanted to try Kevlar/carbon fiber cord, w/ the heavier egg

Very nice Idea!!! Don't lose the hope!

Remember, we're all pulling for ya(or somethin Red-Green)
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Old 3rd January 2011, 07:41 PM   #7
djn is offline djn  United States
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Have a wood turning turn the "egg" then make a female mold and use it to lay up composits. "E" glass with West system epoxy would do the trick. For the tweeter, you could look at some of the bullet tweets that RS use to use.

What are you trying to accomplish with the horn? If you are looking to go down low, you could look at the driver used in the Indignia project. It a .4 cu ft egg, it will go well into the 30s.

That would also look good on a much smaller version of the old Bose "tulip" stands.
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Old 3rd January 2011, 10:51 PM   #8
Vela is offline Vela  Croatia
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I'm glad you guys like it! Thanks for the good info and your thoughts, I knew this would be a good idea coming to this forum! Your knowledge is gold. I don't know when I'll make them but the ideas are brewing! Cheers guys!
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Old 3rd January 2011, 11:08 PM   #9
Vela is offline Vela  Croatia
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Quote:
Originally Posted by Pano View Post
Very pretty!

Would bass notes get this swinging back and forth on those thin wires?
No, that's why it's connected in three points on the bottom side, rather than just hanging in the air. If it's tightened it shouldn't move anywhere. The wires mounting points are rubber coated so they wouldn't "play" like guitar strings. The upper wire would be mounted to the stand via strong coil, so it would be suspended like stringing a bow. I've thought about everything! Believe me I've had time! If I could source good quality silver cable, those front two could carry the signal to the drivers, and the stand would have contacts behind by the rear spike. There are hundreds of ideas going through my mind..
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Old 4th January 2011, 08:50 PM   #10
madisonears is offline madisonears  United States
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Yes, it looks very cool, but I'm not sure it will sound so much better than a more conventional design to be worth the considerable effort of building it. Although, it might help in getting women interested in visiting your apartment!

There is a large reflective surface between the tweeter and the lower driver that might cause response irregularities. Also, those drivers might be too far apart, depending on the xover freq.

The egg shape is elegant and appealing, but what is its function other than appearance? If you are trying to reduce baffle diffraction, there are still edges present all around both drivers, and they are perfectly circular, which is possibly the worst shape. Better to have curves tangential to the front face of the speaker than to have drivers located on the face of a "slice". What is behind the driver is more important on the INSIDE of the enclosure than the outside. What is in front of or adjacent to the driver is more important on the outside than on the inside of the enclosure.

If the egg is a meter long, there may be pipe resonance issues. It will also be difficult to stabilize such a large and unbalanced object with only one plane of support.

But yeah, they do look cool. Nice rendering. Wish I had your skills to express my own ideas. Here is a picture of a speaker enclosure designed to reduce diffraction. I built these before B&W designed the Nautilus.

Peace,
Tom E
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