newbie speaker project

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amongst other projects I have decided to undertake since finding the wonders of diy audio stuff on the web. I would like to build myself a pair of speakers. seeing as the speakers I have currently use an 8" woofer. I thought I should use the same in the ones I build.

Here were my thoughts.
2 X 8" dayton woofer
1 x 1-1/8" dayton silk dome tweeter.

in approxamately 29x18x11" vented

how easy is it to wire multiple woofer, Im thinking I will probably buy preassembled xovers. any comments would be welcome, ie)enclosure size, vent width length, xovers.
 
would this work for a xover??


260-140
DAYTON 2-WAY CROSSOVER 2,000 Hz The Dayton Loudspeaker line of 2-way crossovers were designed using a second order (12dB) Linkwitz-Riley alignment. Dayton metallized polypropylene capacitors are used in both the high and low pass sections.
 
ya I think I will go with parts express.
But I'm thinking I'd like to build a 3-way speaker
with
2xDayton 8" 60 watts RMS/85 watts max 29-3,000 Hz

PIONEER FB11EC14-51F 5-1/4" HD CONE MIDRANGE
50 watts RMS/75 watts 500-14,000 Hz

Dayton 1-1/8" 50 watts RMS/75 watts max 2,000-20,000 Hz

If for some reason this is a bad choice of drivers plz tell me
If it looks ok, I really need help figuring out how to do xovers.
If there is anyway I can avoid building it myself, I like that option.
🙂
Thanks
 
I know I've been warned against buying pre-maid oxvers, but I really don't think I can build them

CROSSOVER 3-WAY 200W This network is an excellent choice for high power 3-way systems. The woofer section rolls off 6 dB at 800 Hz while the tweeter section uses a 12 dB per octave roll off at 4,500 Hz. The midrange section uses a true band pass filter with a response of 750-5,000 Hz. 12 dB per octave roll off.

from what I can see this would work for the drivers I choose, will it work? or would I just be throwing my money away??
 
Well seeing as no-one else is going to step in and tell you not to do it, it looks like I may as well...

The chance that a premade XO will give you good sound with three different drivers is almost zero. Why?:

1. Different drivers have different sensitivities, which means that they will be louder or softer with the same amp signal applied. This needs to be compensated for in the XO. A maker of a standard XO has no idea what the sensitivity of your drivers is, so you will probably get a bass heavy sound, or more likely, one that is ear piecingly treble heavy. For a three way the number of problems is even worse.

2. Something called driver-XO interaction means that the slope of the XO rolloff will depend on the properties of the drivers (eg voice coil inductance). Therefore a standard XO with your drivers may give you dips, peaks etc in the XO region.

3. The choice of XO frequencies is important, and so using a premade XO will not allow you to choose XO frequencies that are best for your drivers.

4. If the driver response is not dead flat, then the XO can be designed to smooth things out, so that the overall response is flat.

Etc etc. There are many more reasons, but that gives you the general picture.

If you want to go down the path of designing your own passive XOs, you will need to read and learn a lot first, and you'll need some basic measuring equipment, such as a measurement microphone and tone generation software or equipment.

For a first attempt you may be better off starting with a kit or a design someone else has worked out.

Mick
 
First of all thanks for the advice thus far.

Ok since I have been steered away from preassembled xovers
I think I will stick to my original two way.

I like the look of these.

http://www.wadsnet.com/~dtenney/dayton_8MTM.htm

I just wanted opinions on this xover design, the xover design is from speakerbuilder.net which seems to be well regaurded.


thanks again I'd still be blankly staring off at into space, thinking I wish I could build speakers, but thanks to this forum maybe I can
🙂
 
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