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Old 3rd February 2003, 09:34 PM   #11
SY is offline SY  United States
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OK, I took a look at it; this Note was apparently a school project. Not a particularly good implementation, as the students noted. Thanks for letting me know about it, though.

Much of my implementation was based on some articles in Speaker Builder about 10 years back. They used cruder accellerometers, so I was able to simplify their circuits a bit since the AD device was so good.
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Old 3rd February 2003, 11:01 PM   #12
e96mlo is offline e96mlo  Sweden
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Have you seen this website?

http://home.insightbb.com/~stephenwm..._Subwoofer.htm

He's basing his design on som old articles. Maybe it's the same?

/Marcus
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Old 3rd February 2003, 11:20 PM   #13
SY is offline SY  United States
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You might look at some of Arthur Brown's articles. I did not have good luck with Mortensen's circuit.
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Old 4th February 2003, 01:14 AM   #14
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Default Re: My throw-together cheap subwoofer

Quote:
Originally posted by nobody special
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...
Wow! Do they stand upright or lay on their sides like my pair of 8.652093346 cubic foot subs, also with 8 inch woofers? Pictures? Oh yeah!!
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Old 4th February 2003, 12:47 PM   #15
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I would definitely be interested in your servo setup too... I've been wondering for a while how hard it would be to do.

Circlotron,
They're meant to stand up (I had to minimize floor space). I will post some pictures when they are a little more together. I am planning on final assembly in the next 2 nights (excluding finish- If they sound good I will veneer them and make some grilles).
How about some details on your system? Do you have any pictures? How does it sound?
I figure that multiple 8's will be punchy, and with an LT circuit, should beable to hit 110db at 20hz.
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Old 5th February 2003, 12:58 AM   #16
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Quote:
Originally posted by nobody special
Circlotron, how about some details on your system? Do you have any pictures? How does it sound?
Yep, there is a thread here. http://diyaudio.com/forums/showthrea...&highlight=245
Soundwise, they are not in the "deathbox" or "housewrecker" category, but they are quite capable of keeping up with a good and full listening level. sound level, it does not go as good as a megabuck system of course, but given the little money spent, and the non-startling drivers used though, it is a winner. It does *exactly* what I wanted it to. Goes as low as many (but not all) big buck systems. Gives real weight to the bottom end like in a cinema sometimes where you hear a real shaker of a note. 25 to 35 Hz is a whole new experience. Feels like when you are standing on the platform of a railway station and the train pulls in and you can feel the clunk-clunk...clunk-clunk under your feet. For anyone who hasn't got a real sub yet, you will be pleased when you do.
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Old 5th February 2003, 02:54 AM   #17
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Nice looking subs!
I hope to experience that "train" feeling soon. I just finished up the main part of the cabinet tonight. I have to cut / route a place for the amp tomorrow, and set the drivers in. I plan to fire it up Thursday evening (want to give the glue and caulk time to set up good). Pictures below.
-NS
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Old 5th February 2003, 02:57 AM   #18
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Keep in mind that I'm 6'4" tall... please ignore the dirty basement. Yes, I am a hillbilly.
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Old 5th February 2003, 02:59 AM   #19
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Here's one of the cabinet bracing... not exactly industrial strength, but it seems to resonate (not really, but you know what I mean) at a fairly high frequency when given the "knock" test. We will see what is to be Thursday.
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Old 5th February 2003, 05:29 AM   #20
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I didn't use any bracing on mine at all and it has a big panel resonance at 126 Hz. I am rolling them off at 12 db per octave from 100Hz so it isn't too much of a problem. 12 cu ft and 8 drivers is 1.5 cu ft per driver so really yours and my subs are worlds apart except for overall size. Should be able to hear yours from my place. Actually, as far as bracing is concerned, I think the best way might be to have a length of angle iron with a sort of foot on each end and screw the feet to the inside of opposite panels. That way when they both try and flex out or in at the same time they will provide the ideal anchor for each other. They will use up their flexing force holding the other still. I see you have a couple of that kind of thing between the front and back. The only reason I didn't use this kind of brace in mine was because I was in too much of a rush. heh heh
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