my car thread
08-11-2010, 02:44 PM
#244
Senior Moderator
Regional Coordinator
(Mid-Atlantic)
Regional Coordinator
(Mid-Atlantic)
iTrader: (6)
anything done to keep the box from sliding around?
08-11-2010, 05:14 PM
#245
Senior Moderator
.
08-11-2010, 06:11 PM
#246
no lol i have to fix that lol
lol im prob gonna keep the motor stock but what i do need is a good set of wheels and to paint the front lip and grill
lol im prob gonna keep the motor stock but what i do need is a good set of wheels and to paint the front lip and grill
08-12-2010, 12:04 AM
#247
post up pics of your whip and make your own thread well show you some love meng!!
08-12-2010, 08:15 AM
#250
Drifting
08-12-2010, 11:45 AM
#252
its that bad?
08-12-2010, 11:57 AM
#254
Drifting
I used one back about 5 years ago before I knew anything about car audio. Now that I understand and have designed/built my own bandpass box, I am able to see the errors in design alone of those boxes, let alone build quality. I remember mine had the "ports" falling out. They weren't glued in at all and just fell out if you turned the box front side down. Also, bandpasses are rather driver specific. There are a few guidelines in terms of volume ratios (ratio of ported chamber volume to sealed chamber volume) and tuning, but it all comes down to the speaker being used in the end. For example, American Bass XFL's like larger sealed chambers than is normally used for a given sub size. In terms of volumes, the ported chamber should be twice the size of the sealed chamber. This is a general guideline and should be adjusted depending on the goal of the setup, but it's a good baseline. My bandpass had a ~4:1 ratio of ported volume to sealed volume. The benefit of the larger ported chamber was the added efficiency that the box gained (louder on less power).
Clifs: bandpass boxes involve a lot of math/science/testing to design properly. There is no "universal" bandpass like the box you're using.
Clifs: bandpass boxes involve a lot of math/science/testing to design properly. There is no "universal" bandpass like the box you're using.
08-12-2010, 12:50 PM
#255
Drifting
To elaborate a bit more on the math involved with a bandpass, my buddy and I designed a ported enclosure in 5 minutes with a piece of paper, pencil and a calculator. The bandpass needed a computer with engineering 3-d modeling software and ~40 hours of time... The ported box took ~2-3 hours to build. The bandpass was up near 20 hours just in construction, then another 20 or so in testing/tuning.
08-12-2010, 01:41 PM
#256
To elaborate a bit more on the math involved with a bandpass, my buddy and I designed a ported enclosure in 5 minutes with a piece of paper, pencil and a calculator. The bandpass needed a computer with engineering 3-d modeling software and ~40 hours of time... The ported box took ~2-3 hours to build. The bandpass was up near 20 hours just in construction, then another 20 or so in testing/tuning.
08-12-2010, 01:49 PM
#257
Drifting
You have no idea... The formula for a ported box is pretty simple. My buddy's got it memorized, and I have it on my computer. But theoretically for a bandpass, you should model it up in a box building software like WinISD. I say theoretically because there's no way to calculate what the cabin will do with any kind of certainty. Some SPL guys have a decent idea based on experience more than anything, but for a totally new car, it is rather hard. That's why I didn't even bother with it. But I was using the software to adjust volumes of the sealed and ported chambers as well as make sure I could still fit the box in the trunk. It did end up fitting, but it took 5 of us to get it in, with the whole thing weighing around 175lbs or so, and had to be loaded through the passengers door. Contrary to what Ebay sellers tell you, bandpass boxes are also larger than their ported counterparts.
08-13-2010, 12:15 PM
#261
08-13-2010, 01:46 PM
#262
Senior Moderator
Regional Coordinator
(Mid-Atlantic)
Regional Coordinator
(Mid-Atlantic)
iTrader: (6)
But the windows def aren't from a 4 door 
((((
