i ust want to make sure my multi meter is right, or if i am doing it right....i have 2 dual 4 ohm subs, and if i connect all v/c's in parallel, i get a reading of 1.4 ohms, is this right, and if i pull one of the v/c's out of the equation i get 1.9 ohms, does any one have any input on this?

Yeah that would be the right impedance make sure your amplifier can handle it though. [img]smile.gif[/img]

[ January 10, 2004, 02:27 PM: Message edited by: Dragonfly ]

thanks man, that almost seems too easy. is there any particular reason why the resistance wouldnt be an even 1 ohm for 4 v/c's?

The resistance is never exactly 4 ohms it varies from sub to sub so you always end up with a 3.x or 4.x per coil therefore you can never get exactly 1 ohm

[ January 10, 2004, 05:48 PM: Message edited by: Dragonfly ]

i see, alright thanx again man

um, at some point you may notice your speakers are rated for IMPEDANCE (AC) while your DMM measures RESISTANCE (DC).. ;)


If your woofer has full specs then the Re value should be the DC resistance of the coil.

Dukk is rigth.

Impedance will change with frequncy and will vastly range. Yes you can have up to 50ohms and above once a driver is loaded into an enclosure.

I myself use a Linear X meter card and built the "impedance cable" and test drivers wonce installed. It gives me a freq graph and shows impedance at cross the bad I specify.

But yes you can do the multimeter thing, but that only gives you a very narrow window of what is really going on.


[img]smile.gif[/img]

^ While no where near as handy (but much cheaper) the old Perfect Interface IM-1 was a nice toy for determining and understanding the impedance characteristics of your system. By far a way underrated tool back in the day..