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Old 29th December 2001, 06:47 AM   #1
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Exclamation Quad Drivers (ooooh =p )

Ok, just hear me out first - it's my first time (on the board/building home audio components/etc). As with everything, I might have gone overboard and I'm planning on constructing a quad driver powered sub enclosure. First of all, would four (10"ers) really be too many, I haven't seen anything like it yet, so I'm thinking maybe there's a reason - dropping down to eights would be fine with me if<sigh>. (If not, then proceed to Q #2!)
I don't plan on building a simple sealed enclusure, as I hear they (for lack of a better word) suck, and provide limited frequency response; naturally a 'vented' enclosure would be better, right? But there are so many kinds..ACH! From what I've read so far, 4th and 6th order bandpass variations offer better response for less power, but the tradeoff is that they blow easily (easier?) because of the compression in the box. If I'm planning on 4 drivers (someone tell me if I should scale back to two..though I'd rather overkill =p ) would the compression just tear the speakers apart? Finally, what's the difference between actual home audio subs and car audio subs - if I'm strapped for cash could I use car audio in place of specific home audio units (or could someone direct me to discount driver). Ok, I hope that made sense to everyone, and responses would be appreciated - construction starts tomorrow

(Would it be too much to ask for both power AND response throughout the spectrum - a tradeoff between the two would be nice, but I'd lean towards sacrificing brute power for sound quality if I had to)
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Old 29th December 2001, 07:16 AM   #2
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well actually the very best tightest most accurate of bass comes from a sealed enclosure....

4 drivers wont be a problem but they should be mounted to form a square this will form what is effectively 1 driver with a Sd equal to 4 times that of a single driver, a Vd 4 times that of a single driver (cause Vd = Sd x Xmax and only Sd changes), Fs equal to that of a single driver, power handling 4 times that of a single driver and an efficiency 6dB greater than a single driver.

Also the baffle should be square and large to minimise the diffraction loss.

If you go sealed you'll need active equalisation but that aint too hard.

btw. @ least 2 ppl on this board have subs that make this look like a baby.
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Old 29th December 2001, 11:02 AM   #3
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For the money you will be very hard pressed to beat the 12" Dayton DVC drivers which are available on special @ http://www.partsexpress.com/pe/showd...=7764&CATID=49
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Old 29th December 2001, 02:12 PM   #4
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Quote:
Originally posted by AudioFreak
btw. @ least 2 ppl on this board have subs that make this look like a baby. [/B]
Heh, lets let him see for himself

www.klone-audio.com

Have a look at the "12 Shivas Dancing" project. By the way, why use 10's?! If you want to go <i>deep</i>, 12 inches or larger is the way to go. You can't beat that Dayton driver AudioFreak suggested for 100 bucks...
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Old 29th December 2001, 02:24 PM   #5
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Hey Bryan,

Didnt anyone ever tell you it is dangerous to your health to operate a sub below 10Hz....... between 2-4Hz the resonant frequency of the human body is reached and well the rest ... well the rest lets just say it aint pretty!!!

@ 6-8Hz internal bleeding can be caused
@below 10Hz most people suffer nausea
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Old 29th December 2001, 03:12 PM   #6
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i think the best would be to mount for woffers on top of each other..then they will all interact with the room from different hight and achieve a more accurate response in room altogheter...

/micke
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Old 29th December 2001, 03:15 PM   #7
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no its actually better to mount them in a square.
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Old 29th December 2001, 04:55 PM   #8
hifi is offline hifi  Sweden
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why? shouldnt the different placing tend to even out room response in the bass area the wavelenghts are so long so stereo perspective shouldnt matter? ..
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Old 29th December 2001, 05:27 PM   #9
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Mine are mounted six vertically per side, ala line source, although at those wavelengths (xover @ 70Hz currently) it's not technically a line source.
Each driver (sorry, twelve 12" drivers, forgot to specify) is internally separated into its own T-S enclosure. Each cabinet is a bit over 7' tall. They're good down to mid to upper twenties at present, but I'm (slowly...glacially) headed towards a servo system with dedicated amps for each driver. I'm used to a sub that will go into the teens and I miss that last octave, although the current rig will produce more SPL, and is much, much tighter than its predecessor, which went deeper, but exceeded Xmax at even moderate volumes.
Four 10"? Only??? Surely you mean per channel...please tell me you mean to use a pair of these...please?
Seriously though, tens will be somewhat lighter and faster, but you won't have the surface area that larger drivers could give you. The usual give-some, get-some set of tradeoffs. Do what suits you, and what you can afford.
Go for it. There's plenty of room for new (ahem...junior...ahem, ahem) members in the Excessive Sub Club.

Grey
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Old 29th December 2001, 06:03 PM   #10
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Avoid:

Bass is about moving air. Whether the enclosure is vented or sealed has a lot to do with it, too. But all other things being equal, the speaker that moves more air will produce bass at a higher SPL.

The air moving capacity of a speaker is the area of the cone times the distance it is able to move (cone excursion). So again, all other things being equal, the speaker with the larger cone will produce more bass.

Two 10' speakers have the same cone area as one 15" speaker, and will produce the same amount of bass if the cone excursions are equal.

Four 10" speakers will produce the same amount of bass as two 15" speakers, so your design is NOT excessive by any means. It sure ain't puny either, but you can't call it excessive.
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