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Old 3rd February 2003, 05:50 PM   #1
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Default My throw-together cheap subwoofer

I decided to build a subwoofer...
I'm using 8 MCM 55-1190 8" drivers in a 12 cuft. sealed enclosure, with a Parts Express 250W sub amp. I plan on using electronic enhancement to extend the low end. This is kind of a throw-together project, but I thought someone might be interested. Let me know, and I'll post some pictures of the cabinet. It looks like a coffin (in size, at least).
It is 72-1/2" tall X 15-1/2" wide X 24" deep! Fun fun fun...
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Old 3rd February 2003, 05:52 PM   #2
SY is offline SY  United States
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Did you do anything special to keep those big panels from vibrating?

Coffins. Love it.
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Old 3rd February 2003, 05:57 PM   #3
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I've got a couple shelf braces in there, and I plan to throw a few 2"X.75"pieces from panel to panel to try and stiffen things up a little...
I did all the cutting yesterday, and the panels have some bracing screwed / glued in. I plan on assembling the cabinets tonight.
Got any ideas that are cheap and easy? (for bracing, that is).
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Old 3rd February 2003, 06:01 PM   #4
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My refrigerator-sized units use 2x4s and carriage bolts. That's pretty cheap and easy.
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Old 3rd February 2003, 06:13 PM   #5
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Quote:
refrigerator-sized units


Cool... what do you have in them?

I like the 2x4 and carriage bolt idea.

I was thinking of gluing/screwing some .75" x 2" piece on end across the cabinet walls- (think fins). I'm already afraid I won't be able to get them out of the basement!
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Old 3rd February 2003, 06:55 PM   #6
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Drivers? They're modified JBL 2245Hs with accelerometer servo driven by a chopped Adcom 555. It's a multiamped setup; the woofers are currently lowpassed at 70Hz, 4th order L-R.

I got a deal on the drivers, which made the whole thing less painful than it might have been otherwise.
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Old 3rd February 2003, 07:49 PM   #7
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Default Servo Control

Tell us more about your accelerometer setup. There have been many rumblings around here about a DIY motional-feedback setup, and I want to know how you did it.
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Old 3rd February 2003, 08:01 PM   #8
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Default accelerometer

I got some freebies from AD. They're +/-100G full range, mounted on the inside of the voice coil former near where the dust cap attaches. As soon as I figure out the $#@&ing schematic drawing software, I'll put the interface up- it's all opamp-based, fed back to the input of the Adcom. Nothing unusual or exotic, just filtering and phase adjusting.

The resulting woofer system is flat (small signal) to a little below 15 Hz.

I have a better idea on how to do this which could be cheaper, better, and more amenable to the typical DIY (less driver surgery), but I need the assistance of someone who really knows their stuff regarding microcontrollers and other digital stuff. Any potential collaborators, preferably in the Bay Area, please email me.
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Old 3rd February 2003, 09:15 PM   #9
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I too am interested in your setup so a schematic would be nice.

Did you follow the appnote on Analog's site?

/Marcus
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Old 3rd February 2003, 09:17 PM   #10
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Quote:
Originally posted by e96mlo


Did you follow the appnote on Analog's site?

/Marcus
No, I didn't see the app note. I'll go take a look.
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