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post #1 of 6 Old 01-23-09, 02:36 PM
sidmeyer
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crossovers

hi

First of all im building two 2way speakers for now which will be my left and right.
Later ill build a 3 way and much later i wanto build like a 10 speaker left and right...but have to start at the bottom and work my way up.

Secondly i have a pioneer vsx-815 receiver ,does 100 W per channel, 8 ohms.
So i wanto build everything one day without blowing it up...

I guess ill start with crossovers.
I wanted to build my own crossover cause its the best way to learn but i ran into a little problem.

i ordered :

Pioneer FP66AP45-54F 8 Ohm 2-1/2" Cone Tweeters -2000 -20000 hz
GM-85/8 GOLDWOOD 5" Sealed Back 8 ohm Poly-Mica Midrange -500 - 15000hz

And for my crossover i wanted to use 6000hz 1st order butterworth.(very simple)

So i dont know how to keep these 2 speakers at 8 ohms.

I called up and one guy ordered this 2way crossover that does 3000hz and keeps the 2 speakers at 8 ohms.

So this is my problem, i dont know what to put in the crossover to keep 2 speakers at 8 ohms, or later when i add many speakers how do i keep them at 8 ??

Last edited by sidmeyer; 01-24-09 at 02:07 PM.
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post #2 of 6 Old 01-23-09, 07:22 PM
sidmeyer
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Re: New from fl

I was wondering if anyone knows of a very good book covering crossover design in such detail i dont have to ask any crossover questions again ?

Last edited by sidmeyer; 01-23-09 at 07:33 PM.
post #3 of 6 Old 01-23-09, 10:18 PM
JCD
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Re: crossovers

This is JUST the beginning of your learning..
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post #4 of 6 Old 01-24-09, 01:24 PM
sidmeyer
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Re: crossovers

thanks JCD let me have a look

Oooh, wow this guy means business, he is strictly using a scientific approach with an audio oscillator, 10 w amp and a audio millivoltmeter to do all his testing with.

So if you must have this equipment to build a good crossover (which i dont have and dont know how to use either ) then it aint gonna happen and ill just have to buy a 3 way package.

But there is this link and this guy didnt use anything else than the specs of the speakers and a few calculations to build a 3way crossover.

I dont know enough to be able to say that his methods is completely wrong or not, is it a good crossover or not ?



thanks for reading

Last edited by sidmeyer; 01-24-09 at 02:49 PM.
post #5 of 6 Old 01-25-09, 06:04 PM
JCD
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Re: crossovers

It is rather hardcore, but it gives you an idea of all that's involved.

I skimmed the link you gave. That, at least to me, over-simplifies the process. There are several spreadsheets on the net that you can plug the parameters into and get a crossover from.. however, it's all "theoretical", grounded in science, but won't usually exactly mirror the real world. When you get to the actual drivers, they behave a little bit different then the spreadsheets say.

I'm waiting for a buddy of mine to find some time and we're going to build my first from scratch crossover. My tools -- an LCR meter, a testing mic and and RTA. I plan on using the spreadsheets as a starting point, then tweaking based on the measurements and my (flawed) ears.

Also, a premade crossover, unless it's designed for the speaker drivers you have, WILL work, but PROBABLY won't give you a "good" result. It works along the same lines as the spreadsheet crossover.
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post #6 of 6 Old 01-27-09, 05:14 PM
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Re: crossovers

Precisely why I went with a proven design the I knew would work.
It can certainly be done, but it won't be easy.
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