What's the deal with .7ohm and 1.4 ohm subs

[57hemi]

Just curious doesnt reall matter I'm getting 2 4's so I can get 1ohm just never seen a wiring diagram for these...... Even on 12volt

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[ciaonzo 5,000+ posts]

If you buy a 4ohm sub and take a meter to it, the DC resistance with the voice coil at rest will likely read somwhere around 2.8 to 3.8 ohms. This is how it has always been but marketing has screwed things up.

DCR is always lower than Nominal impedance. That will make your .7ohm DCR a 1ohm driver and your 1.4ohm DCR a 2ohm driver.

 

[Beatin' 10+ year member]

Just curious doesnt reall matter I'm getting 2 4's so I can get 1ohm just never seen a wiring diagram for these...... Even on 12volt

The manufacturer purposely makes the subs impedance that way to deal with box rise issues. Box rise is when the impedance of a subwoofer rises during playback of a certain range of frequencies.

 

[winkychevelle 10+ year member]

running 3 dual 1.4ohm subs you can wire to 1ohm or extremely close to it.

also some amps wont take .5ohm but will .7ohm

same thing when wiring a dual .7 ohm in parallel. .35 is still easier on an amp than .25 even though it is never recommended competitors are always looking for more power.

 

[57hemi]

Thanks guys, I'll just stick with the normal 1ohm then