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I'm looking at building my first 4th order for a sundown zv4 rev2 15"d2. I have experience building custom boxes but have never built a bandpass. I'm not sure on what ratio to go with. I like lows but would really like something musical. It's going in a extended cab f150 powered by a shark [email protected] Could someone tell me how many cubes for the sealed and ported side and how many sqin my port should be and what's the best to tune it at? Any info is greatly appreciated!

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well first of all i hear for it to be ideal the sub should have a qts rating of .5 and up. the zv4 rev2 15 d2 has a qts of .45. but im sure someone will say, you wont know how it sounds until you try it lol but so far as what i know people typically shoot for a 2:1 ratio. (1 sealed 2 ported) and ported section tuned no lower than 40hz, depending on the bandwidth youre aiming for. a software like bassbox pro will help a lot in seeing what the enclosure can produce. @Triticum Agricolam might be able to help you in this more that i can. i yet have the chance to build one myself lol

 

and im wondering if sundown doesnt give you a sealed spec because of the low qts... :huh: but you see them in 4th orders all the time lol 

Edited by fmedina

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