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Old 4th December 2015, 03:12 AM   #1
djn is offline djn  United States
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Default Need help with crossover

Hi all. I can build anything but not really confident with design. I picked up a pair of speakers with good drivers and furniture grade cabs but they sound like crap. They have off the shelf crossovers that allow a huge spike at 3500hz to scream. Here are the data sheets for both drivers. HELP!



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File Type: pdf 275-070-dayton-audio-dc28f-8-specifications-46121.pdf (205.9 KB, 24 views)
File Type: pdf 21w-8554-00.pdf (143.1 KB, 28 views)

Last edited by djn; 4th December 2015 at 03:25 AM.
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Old 4th December 2015, 03:48 AM   #2
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Hmmm, just looking at that woofer I would think you are pushing it to crossover higher than about 1.5Khz..... You may get away with around 2Khz... with a serious notch to take out the breakup. The tweeter should be fine with a 2Khz crossover I think.

Do you have baffle dimensions (with speaker positions) and an estimate of distance from the frame to the spider on the woofer? These would help with simulating a crossover.

Tony.
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Old 4th December 2015, 04:14 AM   #3
djn is offline djn  United States
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Hi Tony. What do you mean by baffle dimensions? Is the the dimensions of the front of the cabinet?
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Old 4th December 2015, 04:26 AM   #4
AllenB is offline AllenB  Australia
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I'd probably look toward 1.9k to a waveguide, or 1.2k to a dome.

Anyway, the breakup peak seems to be accompanied by an overall reduction of output so listening off 0 degrees might help if you must run it that high.
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Old 4th December 2015, 05:06 AM   #5
djn is offline djn  United States
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No room for a waveguide so I'll have to stick with the dome tweet. What slope should I use to ensure that peak is down enough?
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Old 4th December 2015, 05:17 AM   #6
AllenB is offline AllenB  Australia
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Depending on the point of view, either the peak is relatively harmless because it is only on axis.. or that band is corrupt and should be brought down more than 20dB.

Either way the slope toward the peak is less than 6dB/8ve.
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Old 4th December 2015, 05:19 AM   #7
djn is offline djn  United States
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Thanks Allen. I'll gin up a crossover tomorrow and post it. I am building these for a friend that does not listen with intent. I doubt he will listen on axis.
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Old 4th December 2015, 10:31 AM   #8
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Quote:
Originally Posted by djn View Post
Hi Tony. What do you mean by baffle dimensions? Is the the dimensions of the front of the cabinet?
Yes dimensions of the front of the cabinet, and the coordinates for the centres of the drivers on that baffle.

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Old 4th December 2015, 06:22 PM   #9
djn is offline djn  United States
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The cabinets are 11" wide and 27" tall with the woofer, for the most part, in the vertical center.
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Old 4th December 2015, 06:25 PM   #10
djn is offline djn  United States
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Here are pix of the speakers.
Attached Images
File Type: jpg 00c0c_aXwXOU30ghO_600x450.jpg (12.3 KB, 78 views)
File Type: jpg 00d0d_f9H4W6kiMsU_600x450.jpg (14.9 KB, 77 views)
File Type: jpg 00o0o_i53L2LMEREj_600x450.jpg (9.5 KB, 76 views)
File Type: jpg 00T0T_khDMZp3ZYHX_600x450.jpg (15.6 KB, 76 views)
File Type: jpg 00U0U_4Xfe9e6RWEI_600x450.jpg (12.4 KB, 76 views)
File Type: jpg 01313_41FDuOgbdXb_600x450.jpg (12.6 KB, 12 views)
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