Help with speaker building

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Hi!

I´m a amature at speaker building so I just ask here to see if anyone can help me.

I´m not gonna use a lot of money on this project, but I wanna try building some speakers instead of buying them.

I´m planning on using:

2x Dayton Audio RS180-8 7" Reference Woofer 8ohm
2x Dayton Audio RS100-8 4" Reference Full-Range Driver 8ohm
1x Dayton Audio DC28F-8 1-1/8" Silk Dome Tweeter 8ohm

But my problem is how i´m gonna figure out what components I need in my crossover and how I can calculate the frequencies? I know there´s calculators on the web, but I don´t know how to use them..

What is the best crossover frequency, if that is a valid question!?

And how should I connect all the components together?

I think I have manage to calculate the size of the enclosure, but I´m not sure.
I´m going to try and fail with the enclosure, but I don´t wanna try and possibly FAIL with the crossover.

Hope I have given most of the information you need to figure this out!

Can anybody help me with this?
 
Hi,

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They have designs using that sort of combination of drivers.

IMO if your going for two RS180's and 3 way, this is very good :

Zaph|Audio - ZDT3.5

Parts Express DIY Project

It avoids mixing different sized bassmids as bass and mid drivers,
and optimally uses all the drivers in its configuration, and more
to the point, will probably sound a lot better for a lot less cost.

rgds, sreten.

A different related option :
https://sites.google.com/site/undefinition/diy-sunflowers
 
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sreten: Thanks for the help!

ScottG: I know, but I would just like to try and build a speaker.


But I won´t give up. I shall spend some time and money with this speaker project.


Then the first place you should start - to get an idea of some of the complexity of a crossover, is a look at modeling on a baffle:

Home of the Edge

If you make the baffle large enough, then everything but baffle-step loss becomes far less of a problem - and only then could you implement something close to any standard crossover (though driver dependent as well).

Another direction that would make things easier would be going active with a digital crossover that has eq.. A favorite for being both good quality and relatively in-expensive would be the minidsp:

miniDSP 2x8 kit | miniDSP

This will however require an amplifier for each driver, but there are plenty of good inexpensive DIY amps available (..even designs/boards on this website).
 
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Hi,

In principle I like the "Black Box", but in practice there is a lot to argue
about, not least the horrendously expensive crossover, and just a
general lack of balance and cost effectiveness in the design.

rgds, sreten.

Yeah, even though Tony is cost conscious with the cap's - it's still a costly design. Those impedance comp. circuits do pay dividends though..

I really only provided the link because it was an all Dayton design that was a bit different than the normal variety.
 
Hi,

Time and money don't guarantee anything other than commitment.
Such things are nothing to do with the actual result very often.

Good enclosure design is hard enough on its own, and it matters.

Starting out :

Forget about "classic" speaker design, choose a proven design.
Spend your time on enclosure design details, it will pay off.

rgds, sreten.
 
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