3 way for my dad

architect · 18th January 2009, 08:06 PM

Speakerdesign with
3/4 inch tweeter Eton 25sd1 8ohm
7 inch mid Eton 7 360/37 4ohm
10 inch woofer Audes 75W104-4 ohm

crossover frequency 100Hz and about 1900Hz

about 80 liters bassreflex at 20 Hz

Any advice?

BlueWizard · 18th January 2009, 11:22 PM

Well, first and foremost, I'm certainly no expert. But, I've never let that stop me before.

1.) How experienced are you at designing and building speakers, and more importantly, crossovers?

If you are experienced and knowledgeable, fine. But if you are not, building a pair of speakers from scratch is very difficult for someone with limited experience.

2.) Next, you suggest a group of speakers, but where did this particular collection come from? Did you sort if out yourself, or are you copying an existing design you found somewhere?

If copying, what design and where, meaning give us a link to it.

If you made it up, how sure are you of your choices? If you picked them based on rated frequency response, there is very little chance of it working.

Again, I don't know you, I don't know your skill or experience level, but the advise most here would give is, copy an existing and proven design until you've built your first dozen speakers. Then you can branch off into ground up design.

To reach an existing and proven design, the designer has gone through countless hours of testing and redesign to get everything right.

If you are doing it on your own with no previous speaker design experience, you better count on a year of testing and design refinement.

Steve/bluewizard

PeteMcK · 18th January 2009, 11:46 PM

I'd start by considering what kind of music your Dad listens to, and what sized cabinets would he be happy to fit in with his existing furniture...

If he'd be happy with 2x 80L cabinets, then how about some links to the driver data so we tell you what we think about the drivers?

tinitus · 19th January 2009, 12:22 AM

Quote:

Originally posted by architect

Any advice?

Yes, a better speaker fore your dad
And even when choosing a "premade" design you will have plenty on you hands with just building it

http://www.troelsgravesen.dk/Diy_Lou...r_Projects.htm

Nice looking stuff here too
http://home.versatel.nl/chiararomee/diy/indexeng.htm

Ron E · 19th January 2009, 12:34 AM

Your driver selection is a little unconventional. The classic 3-way was a 10-12" woofer, a ~4-5" midrange and a 1" tweeter - crossover points ~ 500 and 4k. If you want a mid with more bass for a lower crossover, you would typically use a larger woofer as well. For a crossover as low as 1900Hz, a 3/4" is not likely suitable either.

A 3-way is at least 2-3 times more complex than a 2-way. If you want to build a 3-way, my suggestion is to look to a proven design instead of attempting to roll your own. I think you would have more success if you reviewed some existing designs and even technical reviews of loudspeakers and cut your teeth on a couple 2 way designs before attempting to design a 3-way.

architect · 19th January 2009, 09:12 AM

I have bought the speakers cheaply on some second hand website but they are new.

tweeter Eton 25SD1
http://www.eton-gmbh.de/ShowPage.php?PId=18&LangId=0
PDF http://www.eton-gmbh.de/dlstream.php?FileId=98

mid Eton 7/360 37
PDF http://www.eton-gmbh.de/dlstream.php?FileId=88

woofer Audes 75W104-4
http://www.audes.ee/?id=1777&section=2116

It's more like a 2,5 way I think because the mid isn't cut off at the low frequencies. But I'll add my crossoverdesign.

architect · 19th January 2009, 09:12 AM

I've modelled with Boxsim on TS-parameters but I've not measured the drivers.

Here I have a frequencycurve which looks good I'd say.

By the way, my dad likes bass in music, so I told him this means an huge cabinet.

architect · 19th January 2009, 09:12 AM

Picture made in Sketchup. The bassreflex-port is in the middle because of eastetics and calculated at about 20 Hz. I was wondering whether it's oke to say that both drivers mid and woofer use the same 80 liters? How can model the bassreflexport with two drivers on it?

architect · 19th January 2009, 09:12 AM

Oeps I see the tweeter is 25mm so that's 1 inch instead of 3/4 inch. There are several Designs around Eton-drivers and for the crossover between mid and high I've looked at those.

This i my thirst own crossover. Before thisone
1. Linkwitz Orion, 2x Peerless 10", Seas W22 7", Seas Millenium
www.linkwitzlab.com
2. tangband fullrange
3. CSS FR125S fullrange
4. Eton Bluesmall Eton 550/8 and ER4
http://www.lautsprecherbau.de/
5. ...

Added pictures
1. crossover
2. frequencyresponse
3. cabinet
4. section

sorry for last message I have to get used to not using TAB when typing a message

architect · 19th January 2009, 02:20 PM

where are the pictures that I attached?
I need them to illustrate my story and make it possible for others to react on the design.

18th January 2009, 08:06 PM	#1
architect diyAudio Member Join Date: Nov 2004 Location: Friesland	3 way for my dad Speakerdesign with 3/4 inch tweeter Eton 25sd1 8ohm 7 inch mid Eton 7 360/37 4ohm 10 inch woofer Audes 75W104-4 ohm crossover frequency 100Hz and about 1900Hz about 80 liters bassreflex at 20 Hz Any advice?

18th January 2009, 11:46 PM	#3
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	I'd start by considering what kind of music your Dad listens to, and what sized cabinets would he be happy to fit in with his existing furniture... If he'd be happy with 2x 80L cabinets, then how about some links to the driver data so we tell you what we think about the drivers? __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky

19th January 2009, 12:34 AM	#5
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	Your driver selection is a little unconventional. The classic 3-way was a 10-12" woofer, a ~4-5" midrange and a 1" tweeter - crossover points ~ 500 and 4k. If you want a mid with more bass for a lower crossover, you would typically use a larger woofer as well. For a crossover as low as 1900Hz, a 3/4" is not likely suitable either. A 3-way is at least 2-3 times more complex than a 2-way. If you want to build a 3-way, my suggestion is to look to a proven design instead of attempting to roll your own. I think you would have more success if you reviewed some existing designs and even technical reviews of loudspeakers and cut your teeth on a couple 2 way designs before attempting to design a 3-way. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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18th January 2009, 11:22 PM	#2
BlueWizard diyAudio Member Join Date: Jun 2007	Well, first and foremost, I'm certainly no expert. But, I've never let that stop me before. 1.) How experienced are you at designing and building speakers, and more importantly, crossovers? If you are experienced and knowledgeable, fine. But if you are not, building a pair of speakers from scratch is very difficult for someone with limited experience. 2.) Next, you suggest a group of speakers, but where did this particular collection come from? Did you sort if out yourself, or are you copying an existing design you found somewhere? If copying, what design and where, meaning give us a link to it. If you made it up, how sure are you of your choices? If you picked them based on rated frequency response, there is very little chance of it working. Again, I don't know you, I don't know your skill or experience level, but the advise most here would give is, copy an existing and proven design until you've built your first dozen speakers. Then you can branch off into ground up design. To reach an existing and proven design, the designer has gone through countless hours of testing and redesign to get everything right. If you are doing it on your own with no previous speaker design experience, you better count on a year of testing and design refinement. Steve/bluewizard

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