maybe im an idiot

smoker · Post by **smoker** » Mon Nov 13, 2006 5:36 pm

ok my brain is not functioning correctly at the moment...im trying to design a street spl setup for meca for next year and i need to keep the wattage at 4k or less......someone help me do math.......i got the fuse rating x 10 part....but are they using specific numbers regardless of the sub here or what?also what the hell is this little guy supposed to mean? 12^2 the arrow pointing up between the 12 and the 2

{(Total Amperage of In-line Fusing X 10) + Woofer Cone Surface Area} = Pressure Class #

Examples:

40 amps + 2-12 = 526 50 amps + 1-12 = 613 50 amps + 1-15 = 677 50 amps + 1-18 = 754

50 amps + 1-12^2 = 644 50 amps + 2-12 = 726 100 amps + 1-15 = 1177 100 amps + 2-18 = 1509

50 amps + 2-10^2 = 700 100 amps + 2-12 = 1226 200 amps + 2-15 = 2353 200 amps + 2-18 = 2509

50 amps + 3-10 = 736 200 amps + 2-12 = 2226 400 amps + 4-15 = 4707 400 amps + 4-18 = 5018

Bwcad1 · Post by **Bwcad1** » Mon Nov 13, 2006 5:51 pm

i spoke to you in pager messages call me if you want to talk

smoker · Post by **smoker** » Mon Nov 13, 2006 5:56 pm

got it....i dont have a home phone so maybe ill try you this weekend when your not working, id rather have a phone at the shop and i cant swing both right now.....the joys of self employment....its self inflicted poverty really.....at least doing it legally.....if i hid and didnt turn anything in id make a killing but ya gotta pay taxes...

OnYrMrk · Post by **OnYrMrk** » Mon Nov 13, 2006 5:57 pm

nope terry, you, like all others in the SPL world, are idiots....

that includes me, cause I might build a StreetBeat car for next season.

Post by **GlassWolf** » Mon Nov 13, 2006 5:57 pm

what the hell is this little guy supposed to mean? 12^2 the arrow pointing up between the 12 and the 2

twelve squared. (^ is to the power of) so 12*12 or 144

on the fusing, I'd suggest you find exactly how much current your amplifiers draw at the burping frequency (inductive load) in the enclosure you plan to use with the subs you plan to use.
Once you know the exact current consumption, go to BCAE1 and read up on the "fuses" section, and calculate the burn through time based on your burp length in competition.
Then you can use underrated fuses by the calculated percentage to allow you to draw the needed current to burp the system without blowing any fuses, but still make the cummulative fuse rating lower than it'd be going with the actual 100% draw rating.

Post by **GlassWolf** » Mon Nov 13, 2006 5:58 pm

if you need more help, PM me on here with a screen name and IM service and I can add you.

Ryan from Ohio · Post by **Ryan from Ohio** » Mon Nov 13, 2006 6:46 pm

Definetley...

I know MECA goes by fuse size and woofers...

smoker · Post by **smoker** » Tue Nov 14, 2006 9:29 am

yea, thanks for the responses, i miss the old days of iasca when it was all power class.....my goal here is 160 from the trunk....i know its pretty lofty but i think it can be done......

Bwcad1 · Post by **Bwcad1** » Tue Nov 14, 2006 9:51 am

160 is gonna be tough mike stiers does a 153.4 with his neon and is currently the loudest trunk car in the world. and he has been retired for 2 years. i have some ideas but its gonna be a ton of work.

smoker · Post by **smoker** » Tue Nov 14, 2006 10:05 am

i got nuthin but time bill........