tuning and spl

smoker · Post by **smoker** » Wed Apr 26, 2006 2:42 pm

so i was just kinda shooting the shit at the shop today and since we have a couple of company vans (99 chevy express vans) that are empty and really just serve as mdf fetchers and rolling billboards and have nothing other than the factory am/fm in them....we got to talking about what kind of spl system we could do....my thoughts ran to 9 execution 15's or 12's with a pair of dx2000.1's strapped to each voice coil for a total of 36 amps running 9 subs....then i got to thinking about tuning frequency and remember hearing how some guys run tones in an empty vehicle or at least pre system and tune to the resonant frequency of the vehicle....or something like that anyway....well isnt the resonant frequency of the vehicle going to change when you do things like add a monstrous sub enclosure, a wall of amplifiers and a huge bank of batteries....not to mention sound deadening material....after much thought it seems to me that this is not a good way to choose a tuning frequency......and it seems to be kinda counter productive to build your enclosure and then try to find the resonant frequency of the vehicle only to have to modify the enclosure...

just wanted other peoples thoughts thats all

Bwcad1 · Post by **Bwcad1** » Wed Apr 26, 2006 2:52 pm

there is so much to start on here. if you plan on doing a wall this is your best bet. make the wall/box as big as possible make the back wall moveable. the resonant frequency will change as soon as you make the wall and adding anything else will change it. i can get you incontact with someone that can explain a bunch of stuff. like resin increases your freq rhino lining decreases it. with a wall your gonna spend tons and tons of time tuning it. i know guys after 6 months are still working on the tuning. it also depends on what you tune the box 2 how you guide the wave and tons and tons of other shit. also you resonant freq doesnt matter much when you get up that high

also if you do this and you want to compete with it your in extreme 5+ and guess who is in that! cough scott cough owens cough

smoker · Post by **smoker** » Wed Apr 26, 2006 2:55 pm

theres got to be a better way..........every time you move the back wall you change the characteristics of the vehicle and its environment therefore everything you just did is wasted......

Bwcad1 · Post by **Bwcad1** » Wed Apr 26, 2006 2:56 pm

yup! and thats y it takes so long and takes so much time and thats y im not in a wall class! lol u can always build the box and just shoot for the best. testing is the only way to keep getting louder... even with all that equiment if you dont spend tons of time on the box i would almost gurantee you wont break 160... by the way terry if you do this im comin down! and ill help! pm me if you want my number and we can talk further about this.

smoker · Post by **smoker** » Wed Apr 26, 2006 2:59 pm

it was mostly a bullshit session because unless joe is giving away equipment it would be a very expensive system and take up a lot of time and ive got my hands full taking care of customers.....it would be pretty badass though wouldnt it....

joeyc · Post by **joeyc** » Wed Apr 26, 2006 3:05 pm

you know it seems to me a van setup like that would be ideal. first thing i would do is "box" in the van with like 2x4's or even angle iron to connect walls, floor, and ceiling to make an extremely rigid structure. maybe epoxy the wood or weld the metal to them. seems to me that this would really make it easy to eliminate roof flex and in van wall flex. but i don't know i'm sure with that much equipment you would be looking at strong 150's even into the 160's maybe more! just my 2 cents

Bwcad1 · Post by **Bwcad1** » Wed Apr 26, 2006 3:25 pm

well equipment gets you so far after that its box and tuning. it would be bad ass and as much as i love elevation i dont think they would be ideal for an spl setup such as that. joey your on the right track thats what most do. check out termpro's forum for some awsome builds or check out jaythomas on realm of excursion. i wish i could do this but i dont have the time or the money! smoker doing spl isnt that expensive do a street a setup one ex 12 2 dx2000.1s strapped and put that in a crx i bet with the right box you could make brakets...

smoker · Post by **smoker** » Wed Apr 26, 2006 3:38 pm

im considering some sort of spl system for the nissan but it will be tricky and probably not very com petetive but with the little free time i have to compete anyway it wouldnt matter as long as it was a hit with my customers.....

smoker · Post by **smoker** » Wed Apr 26, 2006 3:40 pm

joeyc wrote:you know it seems to me a van setup like that would be ideal. first thing i would do is "box" in the van with like 2x4's or even angle iron to connect walls, floor, and ceiling to make an extremely rigid structure. maybe epoxy the wood or weld the metal to them. seems to me that this would really make it easy to eliminate roof flex and in van wall flex. but i don't know i'm sure with that much equipment you would be looking at strong 150's even into the 160's maybe more! just my 2 cents

that was my theory...build a "room" inside the van and make it part of the van and very rigid and vent everything out the top parallel to the roof line to get the most gain out of the interior shape as possible.....