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Old 4th November 2013, 09:57 PM   #21
tinitus is offline tinitus  Europe
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regarding cone

a friend of mine have a nice pair of old Cerwin Vega S2
you may not believe it, but its got one hell of a fantastic midrange

and the cone is just one piece of paper sheet, cut, folded, and glued

this tells me that its a perfectly adequate method, and simple enough for DIY

DIY cone tweeter ?
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Old 4th November 2013, 10:16 PM   #22
tinitus is offline tinitus  Europe
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weird magnet system
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Old 5th November 2013, 04:04 AM   #23
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I have been wanting to do this for years myself.

I was just looking at some nice styrofoam the other day that I could use for a cone/diaphragm of some type.
I was thinking about building a rectangular version for a small woofer or sub.

But the biggest thing that I have an issue with is what material would you use that is readily available for the surround?

I have seen many discussions on this subject through the years in these threads, But I never saw a decent solution yet.

I had an article once (late 70's) where someone had rebuilt woofer (an AR I think) using the green type of styrofoam used for Flower arrangements as it is very very lite!!
That worked very well but he also used a round replacement surround for it and I want to build a square or rectangular version.

jer

Last edited by geraldfryjr; 5th November 2013 at 04:09 AM.
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Old 12th November 2013, 03:19 AM   #24
JMFahey is offline JMFahey  Argentina
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I repaired and used those weird Yamaha speakers in the 70's, and as I remember, there was not a separate surround but the cone was molded with precision (it was also a very fine grain and smooth surface Styrofoam, not your typical portable frigobox type) , the edge was thin, curved and flexible.
If you tapped the cone, it thumped with a deep note, like the large speaker it was.
And sound was killer, compared to an average speaker of that era (think "Fender" Oxford/CTS/etc.)
Beyond what a DIY Hobbyst can do, it requires an expensive special die.
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Old 12th November 2013, 05:19 PM   #25
Frank40 is offline Frank40  Denmark
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Hello

I started for almost a year ago on a full range project and I got hooked.... you relay can make a super full range unit, but it has a high cost when you want to make the best of the best. I am using some clouded cellular foam as cone it is very light weight, a 6 cone weighed 1.5 gram. Also I am using a field coil as a magnet and a custom made speaker basket. I think I will have them finished primo 2014.

Here is some pictures.

Take care.
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File Type: jpg Capture_459.jpg (617.1 KB, 84 views)
File Type: jpg Capture_436.jpg (767.3 KB, 82 views)
File Type: jpg Capture_452.jpg (553.5 KB, 80 views)
File Type: jpg field coil.jpg (69.5 KB, 79 views)
File Type: jpg Capture_440.jpg (563.7 KB, 34 views)
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Old 12th November 2013, 08:01 PM   #26
Spiny is offline Spiny  United Kingdom
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WoW
And there I was with some card, old wire and magnets and glue

That is really impressive

alan
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Old 12th November 2013, 10:59 PM   #27
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If you're giving a demonstration, rather than turning some guys loose to build their own speakers, you might think about an electrostatic speaker. It's comparatively easy to build a speaker with good fidelity from the ground up.

You can drive it from a low voltage amp if you use a centre-tapped audio transformer, but you'll need a bias supply, probably >500V, but only low current is required, so it's not too dangerous. Not that difficult to arrange either...

Take a look at Rod Elliott's site for some inspiration:- Project 105 - Build an ESL

You can get lo-fi sound out of a flat flexible steel sheet excited by what is effectively an electromagnet with a ground pole-piece spaced close to the sheet. Old-style high-impedance headphones used to be built this way. Again a bias voltage is helpful, otherwise you get all the frequencies multiplied *2.
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Old 13th November 2013, 05:42 AM   #28
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There are many very very good threads about Building ESL's in this forum if one chooses to build one, and, it evolves voltages much much higher than 500V.
Typically it takes at least 2Kv to 3kv of bias voltage to make a panel work successfully.

Low currents are involved but they can reach very high values as well.
And so you MUST practice and RESPECT the rules and cautions that go along with working with such high voltages.

But when done right it is a very rewarding process and hobby.
I am very active in that field of speaker technology and I have dealt with voltages as high as 10KV to 25KV across my panel designs before.

Typically under normal listening conditions the voltages will be no more than about 6Kv Peak across the stator's.
Depending on how hard you push them, and, How loud you listen to them.

Another type of speaker design that can be very rewarding would be of the magnetic planar and ribbon types, Check some of JamesBos's threads and his design's as those are very inspiring builds as well.

Such designs as those are probably easiest to build using magnets and you will still be able to yield some very excellent results with a very low THD factor.
I have seen some builds made as small as what would fit inside an Altoids tin and used for desktop computer speakers that had great results!!!

When it comes to cone size decisions, The overall displacement of the Cone or Diaphragm will determine how loud it can be.
Here is a calculator that will help you to get some kind of idea as to how big you should build your speaker,

Piston Excursion calculator

This is the home page to where the calculator is located,

Bass may be BAD but it sure feels GOOD!

and some chart's can be found here as well,

Volume Displacement For SPL Chart

Also here is a Spreadsheet from Linkwitz lab's that I use a lot too,

https://www.google.com/url?sa=t&rct=...cgjFxR9EneC8Kg

It calculates both Monpole and Dipole configurations for SPL vs Displacement as per frequency.

FWIW

jer

P.S. Great looking build there, Frank40 !!!

Last edited by geraldfryjr; 13th November 2013 at 05:50 AM.
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Old 13th November 2013, 04:13 PM   #29
JMFahey is offline JMFahey  Argentina
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I make my own speakers for my Guitar Amps, and it really involves a lot of heavy machinery (literally, measured in Tons), but as a schoolroom demonstration project, the improvised paper/magnet/wire/glue one is as fine as they come.

The idea is to show kids that the "boring theory" they have to learn in reality is very much alive, interesting, and behind things they love and use everyday.
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Old 14th November 2013, 09:19 PM   #30
Spiny is offline Spiny  United Kingdom
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Could not say better.
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