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Old 14th February 2013, 05:10 AM   #1
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Join Date: Jan 2004
Location: Toronto, ON, Canada
Default Design me a crossover and I'll build it

Need a crossover for a center channel I want to build this summer.

See attached for a pic of the front baffle. Volume is likely to be 1-1.25 ft^3, sealed. Front baffle dimension is 8"x20" WxL.

Drivers are:

Vifa DQ25SC16-04
Fountek FR88EX
2x Silver Flute W17RC38-08

The unit will be below ear level but can be tilted up to have its forward axis meet the ears.

Not looking to spend too much, as you can see from the driver selection. I am OK with steel-core inductors but would prefer poly caps. I expect the crossover points should be somewhere around 2 kHz and 400 Hz. Slopes are up to you.
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File Type: pdf cc baffle.SLDPRT.pdf (108.9 KB, 129 views)
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Old 14th February 2013, 05:17 AM   #2
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If anyone is wondering why I don't build the ZD3C design by Zaph, it's because it's more expensive. I already have the tweeter and the W17RC38 is cheaper than the RS180.

Would like to be able to get everything from solen.ca but it's not a must.
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Old 14th February 2013, 05:30 AM   #3
Jay1111 is offline Jay1111  United States
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I can hook you up, probably wont be until tomorrow though.
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Old 14th February 2013, 02:24 PM   #4
Jay1111 is offline Jay1111  United States
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This is where I'm at right now. Will tweek some more after work.
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File Type: png center response.png (67.5 KB, 514 views)
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Old 14th February 2013, 02:56 PM   #5
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Great, thanks!

I hope you'll be able to get rid of the dip at 2.3ish kHz.

Last edited by 454Casull; 14th February 2013 at 03:00 PM.
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Old 14th February 2013, 09:35 PM   #6
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Any particular reason for the 3.5 kHz crossover point?
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Old 14th February 2013, 10:21 PM   #7
Jay1111 is offline Jay1111  United States
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I'll do what I can to smooth things out, it's diffraction related though. Xover is going to be where everything lines up smoothly. Your ctc spacing is good to just over 4.1 khz.
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Old 15th February 2013, 01:04 AM   #8
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Are you simulating that with no z-offset?
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Old 15th February 2013, 01:14 AM   #9
Jay1111 is offline Jay1111  United States
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Quote:
Originally Posted by dumptruck View Post
Are you simulating that with no z-offset?
No, but the Z axis is only a best guess based on looking at the driver blue print.
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Old 15th February 2013, 01:18 AM   #10
Jay1111 is offline Jay1111  United States
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I'm pretty happy with this one. You can also see the XYZ I'm using. The design axis is 152 mm above the tweeter, to take your placement into account.
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