Speaker Ohm Ratings

[Mattd0344 10+ year member]

If a had a pair of 4 ohm speakers up front in my doors and a pair of 2 ohm speakers in my rear deck, would the ohm ratings matter if i dont have an amp running to them? Only my head unit is running to them

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[bonesninja 5,000+ posts]

if your headunit is 2 ohm staBLE then it makes no difference...but if its 4 ohm stable then you could fukk up your headunit

 

[PV Audio 5,000+ posts]

As a matter of principle, you really want to have all amplifier channels outputting at the same resistance. It's just like your engine will be okay with different compressions in each cylinder, but for ideal operation, matched channels is where you want to go. That said, if the amp is 2 ohm stable (as bones said), there shouldn't be a problem. Only difference is that you'll be sending ~ 2x the power to the 2 ohm speakers.

 

[helotaxi 5,000+ posts]

As a matter of principle, you really want to have all amplifier channels outputting at the same resistance. It's just like your engine will be okay with different compressions in each cylinder, but for ideal operation, matched channels is where you want to go. That said, if the amp is 2 ohm stable (as bones said), there shouldn't be a problem. Only difference is that you'll be sending ~ 2x the power to the 2 ohm speakers.

The amp doesn't give a rip. The two stereo pairs are independent. Ever run a 4 channel with the rear channels bridged to a sub and the front channels in stereo on a 4 ohm load? Did the amp notice? Nope, it didn't. That's because it doesn't matter.

I wouldn't trust a HU amp to be 2 ohm stable and I **** sure wouldn't expect it to come close to 2x the power into a 2 ohm load.

 

[sublimer 10+ year member]

So just to make sure -

I have a Alpine MRP-550 powering 4ohm PG RSD 6.5's up front. I am looking into purchasing Infinity Kappas for rear fill which are 2ohm. Am I good to hook both pairs of speakers to the Alpine?

 

[nismos14 5,000+ posts]

NO. And don't put in rear fill. Just leave it stock or put in some 4 ohm shit.