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Old 09-29-2011, 07:12 AM
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Default external aero question

what effect does an external aero have on like the volume of the box, or how the box acts..? i'm building a box for a pair of 12 inch dc xl's and its strictly spl.. pushing them with 5k and want to use an 8 inch external aero.. so my question is do i still shoot for 3 cubes, or do i have to figure in port somehow?
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Old 09-29-2011, 11:32 AM
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or maybe if you have had experience with the xl's what size box do they like? I can figure out the port after that. again, running them on 5k.. I've got one more night to build before finals and wanna try one more box lol

thanks
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Old 09-29-2011, 11:37 AM
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external wont take any volume away since its all outside. also, if its a flared port with a mounting flange, mount the port from the inside to reduce any resistance. 3 net should be ok. can always build smaller to help powr handling
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Old 09-29-2011, 11:40 AM
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If burp only get yourself a 4 cube box. Those xl will laugh at a 5 k burp
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Old 09-29-2011, 11:42 AM
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Quote:
Originally Posted by taylorpro View Post
external wont take any volume away since its all outside. also, if its a flared port with a mounting flange, mount the port from the inside to reduce any resistance. 3 net should be ok. can always build smaller to help powr handling
He's right about the port being external won't add any volume to the box.

3cf should be just fine for 5k...what tuning?
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Old 09-29-2011, 11:43 AM
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Quote:
Originally Posted by taylorpro View Post
external wont take any volume away since its all outside. also, if its a flared port with a mounting flange, mount the port from the inside to reduce any resistance. 3 net should be ok. can always build smaller to help powr handling
alright, that answers the aero question. thanks! but as for the size of the box, that's kind of what I was wondering. this will be for burp only.. so what's the optimal volume for that? don't really need to worry about power handling, they only have to last one show.. I want to go all out here..
thanks again!
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Old 09-29-2011, 11:46 AM
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my car seems to be peaking around 51hz
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Old 09-29-2011, 11:50 AM
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then tune above it. like 55 or so. burping under tuning will let the subs move a bit more right before that point before they unload. this increases port velocity which should yield a better result. as far as box size, i agree with kyle; around 4 net. the bigger box should provide more output given they hold up
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Old 09-29-2011, 12:18 PM
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given my tiny car, i think 3.5 is about the biggest i can go.. so 3.5 with an 8.6 inch long 8 inch diameter aero should put me around 55hz correct? theoretically this should be the optimal setup for my car for one show pure spl?

thanks for the help guys, i was going in the complete wrong direction...
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Old 09-29-2011, 12:45 PM
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Quote:
Originally Posted by focusedfornow View Post
given my tiny car, i think 3.5 is about the biggest i can go.. so 3.5 with an 8.6 inch long 8 inch diameter aero should put me around 55hz correct? theoretically this should be the optimal setup for my car for one show pure spl?

thanks for the help guys, i was going in the complete wrong direction...
Well don't stress on making exact tuning. Make it 8.5 and call it a day. It won't matter too much. But good luck with the box man
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