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  #1  
Old 03-02-2013, 11:27 AM
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Default 4th order design sketchup

My 1st attempt at 4th design. Blowthrough in Silverado crew cab. Please check my math and let me know if you see any problems.

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Old 03-02-2013, 12:00 PM
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Good design should work well. If you can make ur sealed closer to 6cu and make ur port 12-14sq in of port per cube so if u do 6 cu and u keep ir port 10.5 high make it about 7.25 wide and tune it to roughly 45 and should pick up from 25 to 50hz easily.
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Old 03-02-2013, 12:01 PM
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Btw wat power?
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Old 03-02-2013, 12:02 PM
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Might have loading issues
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Old 03-02-2013, 12:07 PM
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And i agree with ^^^ make ur sealed chamber a little larger.....for music ur gonna want atleast a 2:1 ratio.....if ur using small power make it 3:1 the efficiency will make up for ur lack of power
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Old 03-02-2013, 12:07 PM
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saz-1500 v.2 on the pair.
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Old 03-02-2013, 12:12 PM
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what is fs of sa12 in 1.27 sealed. and that leaves you 3.3 sealed to 4 ported which isnt very good
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Old 03-02-2013, 12:15 PM
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Saz1500 and 2 sa 12s in a 3:1 would be brutal for any musical song
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Old 03-02-2013, 12:17 PM
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my math shows currently 1:1.78 ratio sealedorted based on net volume sealed after .14 displacement of sub. Port is 13sqin/vented foot(5x10.5=52.5sqin port area). With a saz-1500 this looks to be near perfect,

What do you mean by loading issues?
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Old 03-02-2013, 12:20 PM
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dude read the 4th order thread i know its like 1000 pages but theres some basics in there ie a 1:1 ratio is not very good. and by loading he means the subs are firing towards each other. can you make it so the subs fire towards the port?
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Sometimes I just want to drive my shit into a shop and hand them a fistful of money and be like... "Here. Do this shit."
I have zero problems with people having a shop or other enthusiast do their build. But it's a little disrespectful they take credit for it and/or don't correct people when they assume the owner did the work. Happens all the time.
4 zv4 18:2 ct7k: c pillar wall(not sealed off)156.11:
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