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-   -   Help with designing a crossover (http://audiojunkies.com/forum/showthread.php?t=18)

AUr6 08-01-2008 02:43 PM

Help with designing a crossover
 
Hey guys,

I was looking to build some basic "garage speakers" and wanted to follow the Parts Express Project - Woodies. You'll notice the guy that submitted the design bought a generic crossover, but I want to aim to do a bit more than that, even though I've never attempted to build/design a crossover before.

I'm not looking for something crazy good, but it'd be nice to get something in the ballpark... The other tough part is the info available on goldwood speakers... Here's all I could find (from Parts-Express, since Goldwood website isn't helpful at all):

Goldwood GT-302/S 1/2" Mylar Dome Tweeter Shielded
Power handling: 30 watts RMS/45 watts max
Voice coil diameter: 1/2"
Impedance: 8 ohms
Frequency response: 4,000 - 19,000 Hz
Magnet weight: 1/2 oz.
Fs: 2,600 Hz
SPL: 90 dB 1W/1m
Net weight: 2 oz.
Manufacturer part number: GT-302/GT-302S
Dimensions: Overall Diameter: 2-3/8" x 2-3/8", Cutout Diameter: 1-15/16", Mounting Depth: 7/8", Magnet Diameter: 1-7/16", Magnet Height: 5/8"

Goldwood GM-85/8 5" Heavy Duty Sealed Back Midrange 8 Ohm
Power handling: 40 watts RMS/55 watts max
Voice coil diameter: 1"
Impedance: 8 ohms
Frequency response: 800-8,000 Hz
Fs: 470 Hz
SPL: 89 dB 1W/1m
Dimensions: Overall Diameter: 5-1/8", Cutout Diameter: 4-1/8", Mounting Depth: 2-1/2", Magnet Diameter: 3-1/8", Magnet Height: 3/4".

Goldwood GW-10PC-40-8 10" Heavy Duty Woofer 8 Ohm
Power handling: 140 watts RMS/270 watts max
Voice coil diameter: 1-1/2"
Le: 1.85 mH
Frequency response: 36-5,000 Hz
Re: 7.22 ohms
Magnet weight: 40 oz.
Fs: 45 Hz
SPL: 90.4 dB 2.83W/1m
Vas: 1.12 cu. ft.
Qms: 4.50
Qes: .52
Qts: .47
Xmax: 3.55mm
Net weight: 7-1/3 lbs.
Dimensions: Overall Diameter: 10-1/4", Cutout Diameter: 9-1/8", Mounting Depth: 4-3/8", Magnet Diameter: 4", Magnet Height: 1-1/4"

Is this enough information to design a crossover? I've got a couple books I've started reading through and some material online as well to refresh my memory on all this. I don't have any test hardware, but I figured y'all would point me in the right direction... I hoped this might be a decent first post around here...

For fun, you may be entertained to know that I'll be powering these with an old school Marantz 2230 (Watch out for its 30x2 watts of fury!);)
Thanks for any input...

JimJ 08-01-2008 06:06 PM

A three-way is not the easiest thing to begin with...if you like the look, I'd probably use one of Zaph's 2-way designs (which he gives detailed schematics and info for) and do that cabinet work on those :)

And once you get a solid 2-way under your belt, go up to a 3-way...

joetama 08-02-2008 05:04 PM

Jim speaks the truth. I've built a couple of 2-Way projects and have been designing a 3 way project for almost a year now. Getting the drivers from AudioJunkies threw a wrench in the design, but still 3-way is hard to do with out knowing exactly what you are dealing with.

However, honestly with the "woodies' project the speaker drivers themselves aren't the type quality you would write home about. So, they would probably benefit from a specific designed crossover but not that much.

seagrasser 08-02-2008 07:12 PM

If you really wanted to stick with the project, you could buy the crossover mentioned in the design and reverse engineer it. Or look into this one and see if you can predict the response.

http://www.partsexpress.com/pe/showd...number=260-156

It has better components and would probably sound better.

Looking at the PE page on the design, the design would likley benefit from a notch filter somewhere around 8 or 9khz to dampen that spike, and something would have to be done about the dip in the 2.5khz range.

My opinion is that if you want a garage speaker, this would fit the bill. If you want to design your own crossover look for better drivers. I'm not sure these would benefit from the extra effort.

my $0.02

AUr6 08-20-2008 12:57 PM

I appreciate the help & suggestions guys.

I'm not going for something golden here... just something for fun to see what happens. If you saw the speakers I'm replacing, you'd understand that it wouldn't take much for an improvement (think mid-70's era speakers... 3-ways with a hole where a passive radiator used to be... particle board with the back stapled into place)

I guess the main goal for me on this one wasn't so much to try and shape the output of the speakers like you might do for home stereo/theater use, but more or less try to make sure I find the right crossover values within each speaker's useful range...

I figured it might be fun to have something that I could screw around with and not worry to much if I FUBAR the crossover.

herryjohn 08-28-2008 02:00 PM

nice
 
lol...lol.nice

herryjohn 09-08-2008 11:55 AM

do
 
do it better

joetama 09-08-2008 01:48 PM

I understand there would be an increase in performance by using just about anything other than your current setup. However, what really is the point to building it yourself if you aren't going to go for the best sounding design that you can build yourself. If you aren't going to challenge yourself and learn something out of the whole ordeal you might as well go buy some Klipsch or JBL speakers.

D.abore 10-06-2009 08:12 PM

Help with designing a crossover
 
Ah C:Runtime does the job.

Its counterintuitive at first,
but it works, and also provides a sort of
quarantined upload zone.

Thanks I would never have
figured that out from the Winzip help files.

D.abore 10-22-2009 03:41 PM

Help with designing a crossover
 
What do you mean by showing up through your textures? Do you mean youre making your own textures, or just applying premade textures and something else is showing through?
Gimme details and Ill do what I can to help


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