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By Aaron Clinton
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Hello, I'm in need of a box design for a single hdc3.1 18 it's powered with a cab 1600.1 and the max dimensions are 35 long 37 width and 15 tall and would like it to be tuned to 32 hz but any suggestions and would be greatly appreciated!!!
I found a website the I messed with and was wonder if this box would fit the specs for the 18???
1. Product: 2 Fi SP4 18s with Carbon Fiber Dust Caps
2. Specs: Both are dual 1 ohm (0.7 ohm)
3. Description/Condition: Ran them for a little under a year on low power (Audioque 2200). Magnets have some scratches but the surrounds, baskets, spiders, and coils are in excellent condition. Does not include the original gaskets. A couple of the pictures are next to a 10" Kicker "Competition" (lol) for size comparison.
I threw out the original boxes some time ago, but Fi was nice enough to send me two brand new boxes to ship them in. So these will ship in original Fi packaging.
4. Price: Asking $900 SHIPPED OBO for the pair. Because they are dual 1 ohm, I would like to keep them as a pair. NO TRADES, just trying to get rid of all my stuff.
I'm located in Huntsville, AL 35810. Would be willing to drive to meet someone within reason.
Just got the third 18 in this week and we are starting a new build in a 2002 Chevy Suburban. We've got a TON of room as we're going to go up to the B pillar. We're using 3 SSA Evil 18" subs on 3 Linear Power 2250 amplifiers which should be at 2500w ea (maybe a touch more at 15.8v we will be running with dual alts/batts etc). I've modeled these subs till my head hurts and I've asked a few people for opinions on the enclosure and gotten quite a mixed result.
The most popular opinion has been a 4th order using 3 to 3.5 cu ft ea sealed and 9 to 10.5 cu ft ported...modeling looks best to me at 3.5 and 31.5 cu ft with a 30x17.25 port (roughly 90% of total Sd) Gives me a port velocity around 20m/s at peak but the low end of the output suffers a little in the model.
I've built literally thousands of boxes but only a few walls and honestly I'm not sure how it will perform considering the smaller cabin space in front of the box. Our ultimate goal is a reasonably musical response with as much output in the hair trick range as possible. Doesn't have to play into the teens and doesn't have to do 160s at 55hz but would like it to be a demo monster and play music.
With that in mind I've also modeled a 6th order and ported walls and come up with a better looking curve...I have only done a few 6th orders and never anything nearly this large. Most of mine have been 1:1ish depending on modeling but this one seems to work out better at 18 rear tuned to 24hz and 25 front tuned to 50hz.
Has anyone here done a band pass with these subs in a very large vehicle like this? Or would anyone be willing to take a look at the numbers on these subs and see if you might have a better idea on the band pass design for them? I've seen quite a few vids of 4th orders and I know a few people using 4ths but haven't heard them. Considering our goals and the relatively low power I want to take advantage of all that airspace :-)
Subwoofers in question, number of subwoofers & subwoofer size: SSA Evil 18D2 Amplifier being used, specifically the model number. Linear Power LP2250 Fabrication skill level: Expert (27 years building and competing) Preferred material to be used (i.e. MDF, fibreglass, etc) MDF multi layer Vehicle which the subwoofers will be used in: 2002 Chevrolet Suburban Musical preferences: Demoing at shows, pop, some rap and Dub and a LOT of Rock/classic Rock System goals: Primarily fun at shows and parking lots. Demoing low tones and musical Previous subwoofers you have used, and their installation particulars: many many many brands types of installs over 27 years List any research you have previously done: Youtube vids of these particular subs and others with 3 18s as well as comparable subs, checked with other builders and searched here for band pass and threads on these subs.
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