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Old 1st September 2002, 04:47 AM   #11
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Hi Slice,

Here is a very comprehensive list of speaker manufacturer links.
http://members.chello.se/jpo/driveunits.html

Below is a picture of one of my endtable subwoofers. They're 4.5cu.ft and the speakers are TAD 1601a's (about $500USD/pr. on eBay). They are tuned over damped with an electronic boost for a theoretical flat response to about 22Hz.

Enjoy
Rodd Yamas***a
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Old 1st September 2002, 06:26 AM   #12
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The blueprint 1803 looks like a great snag for $279.
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Old 1st September 2002, 02:49 PM   #13
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Just thought that I would mention that 2 ten inchers have the same cone area as one fifteen incher. So if you want to move the same amount of air as a fifteen incher but don't want a fifteen, that is one way to go.

Two twelve inchers have just a little less air moving ability than one eighteen incher.

One more thing. If you have two speakers and run them on different channels of the amp, the sensitivity goes up 6 dB. So if you have one ten inch woofer that plays at 90 dB on one watt input, then doubling the enclosure volume and adding a second ten incher connected to a different channel playing at one watt will make the setup play at 96 dB. (of course you want to adjust the port length).
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Old 1st September 2002, 06:18 PM   #14
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why is that true.. why wouldent you just put them in paralle and get 4 ohm speakers and drive them like that.. im thinkin about 4 10's 2 x 10" per box then have my small eithere towers or small satelite speakers. on top..
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Old 1st September 2002, 06:35 PM   #15
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Quote:
Originally posted by JasonL
why is that true.. why wouldent you just put them in paralle and get 4 ohm speakers and drive them like that.. im thinkin about 4 10's 2 x 10" per box then have my small eithere towers or small satelite speakers. on top..
1/Many amps (most actually) don't really like 4 ohm loads.
2/ if your stereo amp doesn't bridge into mono, it is a way of getting both channels in play (again much more conservatively -- both channels see 8 ohms instead of the 2 ohms they would see with the amp bridged driving a 4 ohm speaker)

A BIG possible advantage of 2 drivers is that can be loaded push-push. The pus-push combination cancels most of the Newtonian load generated by a moving speaker and thereby it is not passed on to the box, making the box work & sound better.

dave
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Old 1st September 2002, 06:39 PM   #16
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so having them move in the same direction or odd even per driver in per box.. ill be startig theis project soon and takeing all this info down ( via printer of course ) hehe and building them ported since ported is low and loud and alows the drivers to breath..
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Old 1st September 2002, 09:06 PM   #17
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--Two twelve inchers have just a little less air moving ability than
--one eighteen incher.

Wouldn't you have to overdrive the 12's to get the same
low freq. output as the 18" playing a modest volume?

If you over drive 12's to get the same results, won't
distortion increase alot compared to the 18" playing a
modest volume ?

If an array of 12's is better, why do prosound folks
use arrays of 18's ? hehe
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Old 1st September 2002, 09:11 PM   #18
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Quote:
Originally posted by thylantyr
If an array of 12's is better, why do prosound folks
use arrays of 18's ?
Efficiency.

dave
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Old 1st September 2002, 09:14 PM   #19
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i agree to that one.. my amp will be running in 4 ohms powering 2 x 10" subs. per side..
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Old 1st September 2002, 09:45 PM   #20
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Quote:
Originally posted by JasonL
so having them move in the same direction or odd even per driver in per box.. ill be startig theis project soon and takeing all this info down ( via printer of course ) hehe and building them ported since ported is low and loud and alows the drivers to breath..
both drivers pushing the box together

Concept woofer
an implementation
bipole concept
bipole implementation
dipole concept

dave
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