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Designing a Speaker

10/11/2017 12:29 PM

Any tips in designing a speaker at 5hz~3000hz. What are the thing to look at particularly on the sizes of coil and magnet. Anyhow, I am not a EE guy.

References anyone?

Thanks.

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#1

Re: Designing A Speaker

10/11/2017 12:36 PM

The secret is in the box....

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#2
In reply to #1

Re: Designing A Speaker

10/11/2017 12:45 PM

Is that a motivational speaker?

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#3
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Re: Designing A Speaker

10/11/2017 1:07 PM

No it's a woofer...

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#46
In reply to #3

Re: Designing A Speaker

10/12/2017 11:53 AM

Note :

Scene from the Directors uncut version of, " Curse of the Cat People ".

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#47
In reply to #3

Re: Designing A Speaker

10/12/2017 11:59 AM

Or, early feline acting career in Vincent Price's, " Tale of Terror ".

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#48
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Re: Designing A Speaker

10/12/2017 12:04 PM

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#49
In reply to #47

Re: Designing A Speaker

10/12/2017 12:48 PM

wouldn't that be "tail of terror"?

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#5
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Re: Designing A Speaker

10/11/2017 1:57 PM

If this is an underwater speaker for your trained marine mammal, this will not motivate.

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#28
In reply to #1

Re: Designing A Speaker

10/11/2017 8:27 PM

It's one of those perpetual machines.

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#40
In reply to #28

Re: Designing A Speaker

10/12/2017 9:02 AM

anyone can build a perpetual machine, if all it has to do is sit there nicely on the bench.

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#4

Re: Designing a Speaker

10/11/2017 1:39 PM

Make sure the speaker will fit into the box, and cut out some wave guides, so he can wave his hands outside the box. That is some out of the box thinking!

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#6

Re: Designing a Speaker

10/11/2017 1:59 PM

Designing a speaker is not a trivial item, especially for the low end of the frequency range you specify. Typical sub-woofers usually have a frequency range of 26-28Hz to about 200-300Hz.

To get faithful sound down to 5 Hz (and you don't mention how much power, either electrical or acoustic, is expected), you may need a very large cone. Good sub-woofers usually are pretty large diameter (10"-12"), and in the olden days woofers often would be as large as 18" or more in diameter. And if you want to produce sounds up to 3000Hz, then the large cone will be working against you. You probably can't do it all in a single speaker and get good sound reproduction.

What is it you are trying to accomplish?

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#23
In reply to #6

Re: Designing a Speaker

10/11/2017 8:15 PM

Yes, there is a lot of science in designing a speaker. Over 30 years ago, There was an article of speaker design, I can't recall what magazine it was, Popular Mechanical, popular science, Mechanics Illustrated or Popular Electronics.

I searched but could not find it....

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#7

Re: Designing a Speaker

10/11/2017 2:04 PM

K.I.S.S. speaker design: connect a field-coil to a large suspended metal plate, listen closely.

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#37
In reply to #7

Re: Designing a Speaker

10/12/2017 6:03 AM

Quad electrostatic speakers Fabulous but very, very expensive, and need a large room. They don't go down to 5Hz, but nor do anybody's ears.

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#8

Re: Designing a Speaker

10/11/2017 2:18 PM

The most important tip is that one should define why one wishes to design something that can be purchased for less than a US dollar a piece. (I'll grant you this is not a high fidelity speaker but fidelity was never mentioned.) Only after you explain why you wish to design a speaker can a "plan of action" be suggested.

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#26
In reply to #8

Re: Designing a Speaker

10/11/2017 8:24 PM

This is actually part of my project. I am task to design a vibrator. It so happen this comes right in front of my face. So I have to design this stuff and how to do about it.

It's some sort experimental. I mean there are technology already patented for these but, I want to do my own tweak and explore other possibilities.

Any good read about designing such especially in the constraints of the desired bandwidth? I'll appreciate if you can lend some references. Thanks.

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#30
In reply to #26

Re: Designing a Speaker

10/11/2017 8:36 PM

What kind of vibrator????? Cause it's been already done..... If it's not the kind my perverted mind is thinking you want, then these guys make industrial ones.

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#32
In reply to #30

Re: Designing a Speaker

10/11/2017 9:55 PM

Like on of this

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#34
In reply to #32

Re: Designing a Speaker

10/11/2017 10:13 PM

Ha ha, that's funny. This is not a speaker at all. There are multiple safety concerns in making and operating a single or multiple axis vibration table.

DO NOT ATTEMPT MODIFYING SUCH A DEVICE!

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#35
In reply to #32

Re: Designing a Speaker

10/11/2017 10:29 PM

And by design I am assuming they meant purchase or hire a professionally designed and built system, or find a test house and hire their services to test vibration test a product.

Do not try and build one of these yourself, this is even crazier than trying to manufacturer a speaker.

Seek professional help (from vibration testing supplier experts and test labs that is).

What have you been telling people that they think you are capable of designing and building a piece of test equipment this complex and sophisticated that will also meet whatever associated vibration standards you are trying to test a product to?

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#36
In reply to #32

Re: Designing a Speaker

10/11/2017 11:02 PM

So a used paint shaker and variable speed controller....?

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#39
In reply to #32

Re: Designing a Speaker

10/12/2017 9:01 AM

A friend of mine was involved in extensive vibration testing of missile components at White Sands Missile Range many years ago. They used something like 100 kW power when activated, no human could be inside the chamber during testing, and the table could support serious tonnage.

It all depends on how big you gotta go, we say over here, go big or go home.

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#31
In reply to #26

Re: Designing a Speaker

10/11/2017 9:53 PM

<sigh> First its a speaker, now its some sort of vibrator for who-knows-what doing god-knows-who.

You have been a member of CR4 long enough to know the rules regarding posting, we cannot help you if you don't explain yourself clearly and in detail we can understand.

Spend less time posting comical gifs and more time on providing details if you are serious about wanting an answer.

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#33
In reply to #26

Re: Designing a Speaker

10/11/2017 10:04 PM

Once again your reply obfuscates more than it clarifies.

I think the theoretical work you are looking for is an explanation of the Thiele/Small parameters.

There are many scholarly articles and theses still written on, about and around the Thiele Small parameters.

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#9

Re: Designing a Speaker

10/11/2017 2:29 PM

Hey, here's an idea - make one that works off carbon, and carbon only, no coils. Or you can coil up the carbon if you absolutely have to, in order to gain functionality.

You are still allowed to place this in a nice wrapper upon completion, and send it to Baxter for evaluation.

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#10

Re: Designing a Speaker

10/11/2017 2:44 PM

When you say designing a speaker: do you mean

A.) designing this, or

B.) buying this and this and

designing this

C.) buying this and this and

designing this

Some other combination, or something completely different?

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#13
In reply to #10

Re: Designing a Speaker

10/11/2017 2:58 PM

Blub blub blub blub blub blub blub....

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#11

Re: Designing a Speaker

10/11/2017 2:52 PM

First we all assume that you mean a speaker and enclosure.

Without a transducer to begin with you cannot design an enclosure for the loudspeaker/transducer.

LEAP is a design program for enclosures that I have used.

LEAP sound design software_Shenzhen Respond Technology CO.,LTD

Now, trust me on this. You do NOT want to even attempt this because you will fail.

I have visited Harmon Cardon's JBL speaker design facility and factory, and others and they have PhD's on staff for this.

Google loudspeaker design and start reading.

Better yet, GO OUT AND PURCHASE ONE OR TWO!

Be prepared to spend at least $1,000.00 for top of the line.

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#12

Re: Designing a Speaker

10/11/2017 2:57 PM

<sigh> Are you really trying to build your own speaker or fit a speaker (or set of speakers) in to a speaker box.

You don't BUILD a speaker, just like you don't build a microprocessor. You select and buy one and integrate it into a larger system.

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#14

Re: Designing a Speaker

10/11/2017 3:13 PM

Are you trying to make your own one of these?:

Or are you trying to make one of these?:

hypersound directional speakers

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#15

Re: Designing a Speaker

10/11/2017 3:22 PM
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#16
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Re: Designing a Speaker

10/11/2017 3:25 PM

Do you have to own your own power station with permitting to drive that?

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Re: Designing a Speaker

10/11/2017 3:44 PM

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#29
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Re: Designing a Speaker

10/11/2017 8:34 PM

I guess if you have difficulty in hearing that you wanna have one of those.

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#41
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Re: Designing a Speaker

10/12/2017 9:03 AM

Or rather you will have difficulty hearing after riding with the boogie blasters.

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#17

Re: Designing a Speaker

10/11/2017 3:44 PM

Guys, this is gutmonarch that posted this. He probably wants to design a speaker so he can talk to space ravioli's.

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#20
In reply to #17

Re: Designing a Speaker

10/11/2017 4:34 PM

Hence my question. There is no guarantee he doesn't want to build his own speaker from scratch (quite the opposite in fact when he starts talking about magnet and coil sizes).

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Re: Designing a Speaker

10/11/2017 8:26 PM

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#19

Re: Designing a Speaker

10/11/2017 3:47 PM

<unsubscribe>

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#21
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Re: Designing a Speaker

10/11/2017 4:41 PM

Can't say as I blame you!

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#24
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Re: Designing a Speaker

10/11/2017 8:16 PM

duh, how can you unsubscribe you are just into it.

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#25
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Re: Designing a Speaker

10/11/2017 8:18 PM

I have yet to see <unsubscribe> to really unsubscribe.

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#22

Re: Designing a Speaker

10/11/2017 4:44 PM

Are you serious? <unsubscribe>

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#38
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Re: Designing a Speaker

10/12/2017 8:57 AM

I will <unsubscribe> if that tone is kept up!

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#42

Re: Designing a Speaker

10/12/2017 9:03 AM

I use one of these. it is in my basement TV room. Concrete slab with cement block walls. It WILL shake (vibrate) the walls.

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#44
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Re: Designing a Speaker

10/12/2017 9:36 AM

I guess I need one of those for shaking my LENR reactor.

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#43

Re: Designing a Speaker

10/12/2017 9:31 AM

Why 5 Hz ? That is not really a sound but more of a vibration. Telephone range is around 300 Hz to around 3K Hz. That is the most normal range for reproduction. To get lower with a single driver requires either MLTL (Mass Loaded Transmission Line) or a horn or a combination of both and it can get down to an in room response to 40 Hz.

Do a search on " Ron Clarke horns" (me). There will be several links primarily from Martin King which gets deeper into the physics.

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#45
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Re: Designing a Speaker

10/12/2017 11:06 AM

Nice one Ron The sound is quite a crisp.

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#50

Re: Designing a Speaker

10/14/2017 8:20 PM

I think what he may be trying to do is go down low enough so the signal will be more flat in the listening range or 20hz to 20000hz.

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