Have you ever considered to make your own full range unit. I can't let it be..... I have to try it and if any of you have the same idea, let us make a thread to share knowledge and ideas. I have ordered some voice coils, suspensions and the right glue today. My first idea is to make a bending wave unit, I will get back with some drawing later.
Please let me know what you think......
Please let me know what you think......
Here is some of my ideas.... The membrane is made of depron a very light weight material and easy to work with, the weight for a 6” membrane is only 2,4g.
I did some experiments on the suspension, and was amassed how much it effects the high frequency respond so I will try not to use one.
Any way here is some pic's of the membran. Any comments.
I did some experiments on the suspension, and was amassed how much it effects the high frequency respond so I will try not to use one.
Any way here is some pic's of the membran. Any comments.
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Is this just for fun? I used to make small electric motors and things like that but never wanted to make a driver.
Cal,
You already know what I am going to suggest to use for the driver membrane/piston.... Paper-faced foam core board 🙂😉🙂. I am only half kidding, I think it would work well as it is very stiff, is super light, has built-in damping, etc... In fact, I think there may be a company making speakers with it. There is a guy who made a speaker with a foam plate (see link), I think foam core board would work well. Depron is a closed-cell polystyrene foam (aka egg cartons). I think it would work well as driver, and in fact may be same material as foam plate used in link below.
Xrk971
Homemade Foam Plate Speaker - Hacked Gadgets – DIY Tech Blog
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The material is a good choice for drivers - bond some strands of carbon fiber to it and it in a radial pattern with rings like spiders web and it will work better with more damping and stiffer for tiny mass added. You can't skip suspension. What will hold it in place and provide restoring force? The spider is what does this - it can be done via other means (springs, folded paper, etc) but needs to be there. Also, a surround is needed otherwise it is very inefficient as air between front and back simply gets stirred by the membrane as it leaks across edges - you won't have any bass. Try running an old speaker with deteriorated foam surrounds - all you get is mids and highs with bad efficiency. The surround also acts as suspension.
That implies no suspension at all, including what we'd call a spider on the voice coil former. Without that or something like viscous ferrofluid I remember seeing used in tweeters , wouldn't you likely have issues with maintaining alignment of a linear oscillating motor, or for that matter controlling the inevitable flexing of diaphram?
I'd imagine the moving mass of the attached load is only one of the factors involved?
Looks like you pulled apart an existing driver for voicecoil, magnet, etc as I see a spider, foam surround, etc. This could be a cool large area membrane speaker. I would add multiple voicecoils along large panel to boost spl. If you actively managed which coils were driven with multiple amps and dsp, you could do some cool effects and correct for distortion, etc. The single membrane could be a multiway but have phase coherence as the movements are all tied together. Looks fun. 🙂
I did take a Monacor SPH 170 C apart for it's magnet system, but I did order some voice-coils, spiders and some foam surroundings because I did not know where this project would take me.
Great link for the Bertagni Electroacoustic, I totally forgot but I did own a par of BES speakers many years ago.
I am still in the process of making a holder for the magnet-system.
Great link for the Bertagni Electroacoustic, I totally forgot but I did own a par of BES speakers many years ago.
I am still in the process of making a holder for the magnet-system.
Hi freax, it can bee done....Another hobby of mine is building airplanes here we use epoxy glue. It can be made with silk or fiberglass or even carbonfiber with build in suspensions at different levels in radius.
what about this.
A skeleton speaker cone interlaced wireframe made out of lightweight plastic thatis then woven with silk strands?
A skeleton speaker cone interlaced wireframe made out of lightweight plastic thatis then woven with silk strands?
Is there a thread or forum where people make their own drivers from scratch? I mean the whole works like winding voicecoil, laying up suspensions and doping, forming cones from various materials, making different surrounds, etc. We would buy NIB magnets, and cannibalize the frame from another driver but otherwise it's 'roll your own' It's not so crazy to lay up cones out of feathers doped with epoxy, etc.
I would actually enjoy this but need guidance on theory and models so we don't just blindly make stuff that is bad. Heck, why not superconducting voice coils suspended in liquid nitrogen cryostat if you really want to go all out? I think custom cones with active damping would be pretty cool, as are active suspensions using rheorlogical fluids (aka magnetic slurry suspension shocks like on Ferrari's and race cars). You can make some really interesting no holds barred technological tour de force drivers.
I would actually enjoy this but need guidance on theory and models so we don't just blindly make stuff that is bad. Heck, why not superconducting voice coils suspended in liquid nitrogen cryostat if you really want to go all out? I think custom cones with active damping would be pretty cool, as are active suspensions using rheorlogical fluids (aka magnetic slurry suspension shocks like on Ferrari's and race cars). You can make some really interesting no holds barred technological tour de force drivers.
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I do not know of any scratch building speaker sites, and can't find to much info on the topic on the internet to. But I do have some insight on how speakers work but I am no expert, but this is way I do thesis experiments.
When I started to designing air planes I did not know anything about that, but has learned along the way.
If you like to make a cone of depron you can do that with vacuum forming. I don't like the idea of making a cone out of feathers, feathers is basic horn or neighs and is a heavy material.
When I started to designing air planes I did not know anything about that, but has learned along the way.
If you like to make a cone of depron you can do that with vacuum forming. I don't like the idea of making a cone out of feathers, feathers is basic horn or neighs and is a heavy material.
Great job - looks like a lot of fun. 🙂
You might want to use L shape cross beam to reduce flex of that flat aluminum bar that may improve efficiency.
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