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| Electronic Component Discussion Discussion of anything pertaining to electronics and the components that make them work |
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#1
08-18-2009
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Big Woofer
It's here:
  Looks smaller in the pics than it really is. It completely dwarfs the old Akai and the two 15's right next to it. Next step - build the box. I figure when that's done I can worry about the amp. The way our weather's been, winter could be starting again at the end of July and I need the box done first 
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#2
08-18-2009
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Quote:
__________________
Main: i7 920@4GHz w/Zalman CNPS10X Flex, ASUS RIIE, 6GB Corsair DDR3-1600, XFX HD5870, EVGA GTX260, ASUS Xonar DX, X25-M 80GB, Samsung 1TB F3 + 1TB F1, Kingwin LZG 1kW, CM ATCS 840, Dell S2209W, Win7 x64. Folding/2nd: Q9550@3.8GHz w/Xig S1283, ASUS P5Q Pro, 4GB DDR2-1000, MSI GTX260, Auzentech X-Plosion, WD 640GB, Corsair HX520, CM 590, Dell 1905FP, Win7 x64. HTPC: E2140@2.96GHz w/ TR SI-120, Foxconn P45 ELA, 2GB DDR2-667, EVGA 9600GSO, WD 80GB, Antec NeoHE 500W, CM Centurion 5, Win7 x64.
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#3
08-18-2009
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It feels that way.
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#5
08-18-2009
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About 405 liters after bracing tuned to 11.5Hz. It's going to be a big box. 48x24x24."
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#7
08-18-2009
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Not really. I'm basing it off this design, slightly modded: http://www.avsforum.com/avs-vb/showthread.php?t=875108
I don't like the bracing strategy - I'm using 2x2's. The port's going to be 6" in diameter and 38" long. It models ok in Bassbox and WinISD, but the vent speed could be lower down at the tuning frequency. I'm justifying it by figuring not much content is going to get down to 11.5Hz.
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#8
08-18-2009
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I'd at least use a 6" aeroport. That's way, way too much box for that port. You're supposed to have 16 square inches of port area per 1 cu ft of box, you have 14.3 cubic feet of box before displacement.
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#9
08-19-2009
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I'm aware of how it's "supposed" to be done, thanks - not really new to this
 I wanted to use an 8" port - the software killed that one pretty quick. Port resonance is too low and it won't fit the box. Two 4" ports would do, but vent velocity is even higher than one 6" port. As it is, I get around 18m/s at the tuning frequency... I can live with that. It rolls off pretty quick above that, and port resonance is around 160Hz. 7" might be a decent compromise, but then I have to worry about finding something in that size or building a little square tunnel in there. According to Bassbox, I actually have the box volume at 450L (16 cubic feet), after the bracing and driver. Port is actually 36" long. It's going to be tough finding PVC pipe in that diameter - I looked for it in Swift Current yesterday, and nobody had any. Need to hit a major city for that I guess. Edit - 415 liters. Was looking in the wrong place - it's 450 before all the goodies.
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