posted
Well Dukk, since this thread is now 8.5 months old, it looks like you won't have to re-write that tutorial this year.... This could stay up on the list for a year or two at this rate....
------------------ BigRedGuy Still bumpin' after all these years :) Kenwood/AudioControl/Orion/Orion/LightningAudio
posted
For the port that fires from the sub-chamber to the free chamber, should that port be split with 1/2 of it in the sub chamber and 1/2 in the free chamber, or should the entire port be in the sub chamber, with only the opening of the port in the free chamber??? If this makes no sense, I'll try to clarify it as needed.
posted
Hey Duck. I built the abc box almost a year ago, but now I have an amp that will do the box and sub justice. It is a pioneer 12" IMPP being pushed by a Beta 100. I will post the spl when I get it metered. Thanks again for the design.
------------------ If you think I look weird,then wonder what I think of you MECP Certified
Posts: 30 | From: Charleston, MS | Registered: Jun 1999
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posted
CDT- I don't think that it matters as long as you factor in the volume of the into the each chamber. Example- if the port was .3 cubic feet and you put 2/3rds into the larger side, add .2 cubic feet to that side and .1 cubic feet to the other side.
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Posts: 7813 | From: Charlotte,NC USA | Registered: May 1999
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posted
So if I want to do a 3 cubic foot enclosure tuned to 30hz, i'd figure the box to be tuned to 30 hz using 2 equal size ports, although there would actually be 3? So i'd have a 2ft^3 chamber containing the woofer and a port, a 1ft^3 chamber with the same size port, and a divider in the center with the same size port also? So to tune a 3ft^3 box to 30hz, i'd use 3 3"diameter X 11.9"long ports according to my calculations. If these calculations are correct, how much volume do I need to add to the Gross Box Volume BEFORE the ports in order to end up with 3 cubic feet after ports(I already have allowed for woofer displacement). If this is just confusing rambling email me and I'll clear myself up....well hopefully.
posted
i have got an abc box for an audiobahn aw12 and the low end outta it is freakin amazing. the total box is close to 6 cuft. i would bet that outlaw its close to a 46 or higher. its loud and it sounds great. thanks for the box design dukk.
------------------ Memph!s, DD, Po!k, C!arion 145.2 and climbing THANKS NEON BOY
posted
Hey Dukk let me know if you are on ICQ anytime soon.. I need to ask you about a few things..
CSUHO- You remember how the box volume was off from what you calculated? You are going to crap yourself when you find out what yours ended up being tuned at.. Also Eric is dying to hear it after I told him about it...
posted
You assumed correctly Dukk. Thanks for the info. Also, to determine how large the box should be do you go by the recomended enclosure sizes, or do you run a desgin program too see what type of curve you get at different size enclosures. The specs on the woofer(audiobahn-AW1205) are Fs 40hz, Qms 4.17, Qes.56, Qts.49, Vas 26.4L or .9ft^3, EBP 71, Revc (2 each @) ohms 2.05, SPL (1 watt, 1 meter)dB 92.9, Xmax 15mm, Levc(mH) .52. I know some of those are unnecessary for determining needed enclosure size but I just put them in anyway I'd really like to give one of these enclosures a try, just not sure if 3 feet of Net volume is the right size or if its too big/small, Hope you can help out.
posted
Well my post didn't show up so I'll try again. Sorry if it comes up twice now. Anyhow, how do you all determine what volume these boxes need to be built to. The Vas on the sub is 26.4L or .9ft^3, Qts is .49, I have however much volume is necessary(under 10 cubes....lol), and I want it to tune around 30-32hz so that it has fairly good depth and range. Just incase you want to know it's an audiobahn AW1205 and i'm running it off of a memphis AR100HC, so that kinda gives you an idea of what power it will have. etc... According to the program I have 2ft^3 has the smoothest frequency response, while 3ft^3 just has a bit more spl, I'd like to get more input on that area first before I build one of these boxes, because i'm not sure if they act the same as a normal ported box, so therefore the graphs I'm getting by using the normal ported design might not be accurate.
