JeremyN Posted April 6, 2011 Report Share Posted April 6, 2011 Can somebody please explain box rise and how to calculate it?? 2 12" Jeff Vue Customs 1 set MB Quart FSB 216 in doors1 American Bass 100.1 on sub1 Hertz EP2 on doorsJVC deck IPOD controlStock 105 amp alt DD-1big 3new build in Chevy caviler http://www.stevemead...chevy-cavalier/last set up in the ZX2 http://www.stevemead...-current-build/old build log http://www.stevemead...-1998-ford-zx2/ Gold is the money of kings, silver is the money of gentlemen, debt is the money of slaves. Just my .02c that shop needs keep those doors open so they have to charge for it if people think 10k is a lot then they should get into other hobbies.. like masturbating, cause any hobby cost money to maintain Lol no, I'm smarter than that bro haha. Fool me once, shame on you, fool me twice..............go fuck yourself lol Link to comment Share on other sites More sharing options...
Superjay Posted April 6, 2011 Report Share Posted April 6, 2011 you calculate it with a computer or using your DMM during a slow sweep the rise is actually an impedance rise caused by pressure changes and flux changes during transients. You'll see the sharpest and most pronounced rise at the resonant frequencies of the enclosure and the sub, or the enclosure, sub and vent, if there is one Principal JTech Consulting - Leader in 12-Volt Training and Product PlanningIt's not about how much power you have, but how well you use it Link to comment Share on other sites More sharing options...
Azagtoth502 Posted April 6, 2011 Report Share Posted April 6, 2011 A good read on it. http://www.stevemeadedesigns.com/board/topic/76995-impedance-rise/ pa-pa-platypus sorry not everybody has a companies nuts so far down their throat they catch every drop ball sweat when it falls Link to comment Share on other sites More sharing options...
JeremyN Posted April 6, 2011 Author Report Share Posted April 6, 2011 so are all box types affected 2 12" Jeff Vue Customs 1 set MB Quart FSB 216 in doors1 American Bass 100.1 on sub1 Hertz EP2 on doorsJVC deck IPOD controlStock 105 amp alt DD-1big 3new build in Chevy caviler http://www.stevemead...chevy-cavalier/last set up in the ZX2 http://www.stevemead...-current-build/old build log http://www.stevemead...-1998-ford-zx2/ Gold is the money of kings, silver is the money of gentlemen, debt is the money of slaves. Just my .02c that shop needs keep those doors open so they have to charge for it if people think 10k is a lot then they should get into other hobbies.. like masturbating, cause any hobby cost money to maintain Lol no, I'm smarter than that bro haha. Fool me once, shame on you, fool me twice..............go fuck yourself lol Link to comment Share on other sites More sharing options...
Superjay Posted April 6, 2011 Report Share Posted April 6, 2011 ALL enclosures are effected...even infinite baffle...it's unavoidable, but it can be managed Principal JTech Consulting - Leader in 12-Volt Training and Product PlanningIt's not about how much power you have, but how well you use it Link to comment Share on other sites More sharing options...
blownengine Posted April 6, 2011 Report Share Posted April 6, 2011 An "x" ohm woofer wll not always stay at "x" ohms. It depends on so many things it's hard to narrow it down. Box size, tuning, box bracing, coil material, coil temperature, ect... To calculate it you need a clamp meter and a multi meter. Put the clamp on the positive speaker wire and place the DMM probes in their respective amp terminals. Burp different tones, and record the numbers from both devices. To find how many watts your amp puts out at each frequency you multiply the two numbers. To find the ohm load at each frequency divide the two numbers. EXAMPLE: I recently did this to my amp. 32 hertz I had 38.5 volts and 14.86 amps. Multiply them to get 572 watts. Divide them to get 2.59 ohms. My sub is wired to a 2 ohm nominal load. (Or was it 1.4?) Anyway subtracting the two different ohms will give you how much "rise" you have at each frequency. 2003 Dodge Ram 1500 SLT (Yea its got a Hemi)Alpine CDA-105KnuKonceptz 0ga CCA Big 3 with Yellow Top 15" SoundQubed HDC3DC Audio 1.2K (Bass)Pioneer 6x9's (Front)Pioneer 6.5's (Rear)Kicker 3.5's (Dash)Sony amp on the highs. (Hey it was free) Link to comment Share on other sites More sharing options...
Superjay Posted April 6, 2011 Report Share Posted April 6, 2011 what the hell is an "ohm load"??? Principal JTech Consulting - Leader in 12-Volt Training and Product PlanningIt's not about how much power you have, but how well you use it Link to comment Share on other sites More sharing options...
Beanz Posted April 6, 2011 Report Share Posted April 6, 2011 what the hell is an "ohm load"??? the resistance to what ever the "load" is maybe the amp or sub? That's why they don't deliver. Yer ass better go sit along the side of the road and wait. You can't expect them to travel up some dirt road in a hick / back woods town. Thats how horror movies start I explain things very simply and use analogies in terms of Pickles, and grape drink, pool noodles and jackhammers...if you can't put 2 and 2 together there man, There simply is not much more I can do. Link to comment Share on other sites More sharing options...
blownengine Posted April 6, 2011 Report Share Posted April 6, 2011 what the hell is an "ohm load"??? How many ohms the amplifier is seeing. Did I do a poor job of explaining? 2003 Dodge Ram 1500 SLT (Yea its got a Hemi)Alpine CDA-105KnuKonceptz 0ga CCA Big 3 with Yellow Top 15" SoundQubed HDC3DC Audio 1.2K (Bass)Pioneer 6x9's (Front)Pioneer 6.5's (Rear)Kicker 3.5's (Dash)Sony amp on the highs. (Hey it was free) Link to comment Share on other sites More sharing options...
Superjay Posted April 6, 2011 Report Share Posted April 6, 2011 the word you're looking for is IMPEDANCE Principal JTech Consulting - Leader in 12-Volt Training and Product PlanningIt's not about how much power you have, but how well you use it Link to comment Share on other sites More sharing options...
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