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Preventing box impedence rise?

 

Gold Member
Username: Drivingreckless

Near tampa, Florida United state...

Post Number: 2000
Registered: Apr-06
inverting the sub will help???
 

Gold Member
Username: Southernrebel

Monroe, Louisiana USA

Post Number: 3525
Registered: Mar-04
nope...no way to totally prevent it. its going to happen no matter what. You just have to design around it.


box rise it the very reason that SPL competitors run their amps a extremly low load to burp.
 

Gold Member
Username: Drivingreckless

Near tampa, Florida United state...

Post Number: 2001
Registered: Apr-06
so thier is no way around it except low loads on the amps?
how do u calculate box impedence rise?
 

Gold Member
Username: Southernrebel

Monroe, Louisiana USA

Post Number: 3526
Registered: Mar-04
No real was to calculate it without actually building the box and testing it in your vehicle. The same box/subs will actually see different box rise in different vehicles.

design, build, test, tweek, design, build, test, tweek, design, build, test, tweek, design, build, test, tweek, design, build, test, tweek, on and on and on.
 

Gold Member
Username: B101

USA

Post Number: 3656
Registered: Sep-05
box rise happens @ certain frequencies & is directly related...

to calculate ur impedence rise you must measure your ac voltage output on the speaker terminals... record that.. Next measure your ac current, you can use a clamp meter on 1 of the speaker wire leads, or u can series a dmm between the + terminals and the speaker + wire... (always measure current in series) record current

now calculate your AC impedence (Z) which is the equivalent to DC resistance (R ) <<see how simple its is impedence and resistance same thing. lol
V= voltage I= current

formula
Z = V/I
^^that means divide the current into the voltage...

:-)
 

Gold Member
Username: B101

USA

Post Number: 3657
Registered: Sep-05
or get bass box pro... lol
 

Silver Member
Username: Renegadesrun

Lafayette, IN US

Post Number: 393
Registered: Oct-04
Impedence is the actual resistance your amplifiers will see from your sub.

Too add....even distance of the port from the rear deck lid will effect impedence rise, as proximity to the gate effects loading, which effects, resistance, which directly effect rise.

As will the wire you use. (Resistance) (Wire is wire eh?...Yea,.... ok.)

To prevent? A better sub, or a better box.

As for helping by inverting? Since a larger enclosure lowers tuning and tuning effects rise? Maybe. Were well over my head here.
 

Gold Member
Username: B101

USA

Post Number: 3668
Registered: Sep-05
impedence is very touchy.... just by blowing air from ur mouth over a sub, u will change its dc resistance quickly...

hook a ohm meter up to 1 and blow... :-)

many factors factor in with impedence rise... even the atmosphere...
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